snl 30 and snl31 plummer block housings solve … e i snl30...designs of split plummer block...

SNL 30 and SNL 31 plummerblock housings solve the housingproblems(Replace SD housing range)

Contents

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Made by SKF® stands for excellence. It symbolises our consistent endeavour to achieve total quality in everything we do. For those who use our products, “Made by SKF” implies three main benefits.

Reliability – thanks to modern, efficient products, based on our worldwide application know-how, optim-ised materials, forward-looking designs and the most advanced production techniques.

Cost effectiveness – resulting from the favourable ratio between our product quality plus service facilities,and the purchase price of the product.

Market lead – which you can achieve by taking advantage of our products and services. Increased operating time and reduced down-time, as well as improved output and product quality are the key to a successful partnership.

1 Product information.................................................. 3

Fewer bearing replacements and less maintenance... 3Plummer block housings have much to offer ................ 3SNL 30 and SNL 31 plummer block housings have more to offer......................................................... 3One basic design – many variants................................ 4Costs and risks – at a low level .................................... 6High performance for all sectors................................... 8

2 Recommendations.................................................... 10

Bearing arrangement design ....................................... 10Bearings on adapter sleeves on smooth shafts............ 10Bearings on cylindrical seatings on stepped shafts ...... 11Standard seals.............................................................. 12Special seals................................................................. 15End covers.................................................................... 17Locating rings ............................................................... 17

Application advice for trouble-free operation............ 18Lubrication .................................................................... 20Mounting ....................................................................... 22Mounting SNL 30 and SNL 31 housings with labyrinth seals............................................................... 24Mounting SNL 30 and SNL 31 housings withtaconite seals................................................................ 26Mounting SNL 30 and SNL 31 housings with oil seals ......................................................................... 28

3 Product data .............................................................. 30

Designations and housing data .................................. 30Designations ................................................................. 30Load carrying ability ...................................................... 31

Product tables............................................................... 34Large SNL plummer block housings for bearings on adapter sleeve ......................................................... 34Large SNL plummer block housings for bearings with cylindrical bore ...................................................... 42

Other products for trouble-free operation.................. 48

The SKF Group – a worldwide corporation................ 54

Fewer bearing replacements and less maintenance

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Plummer block housingshave much to offerThe main benefit of split plummerblock housings is their easy installation;pre-assembled shafts can be mountedin them. When the housing bases areattached to the base plate it is thenonly necessary to place the housingcaps in position and to tighten the attachment bolts to complete theinstallation.

Split plummer block housings avail-able on the market are mainly intendedfor self-aligning ball bearings, sphericalroller bearings and CARB® bearings ofISO Dimension Series 02, 03, 22, 23,30, 31, 32, 39, 40 and 41. They canoften be fitted with various differentseals. Many designs and variants ofsplit plummer block housings are avail-able making the use of tailored hous-ings unnecessary and thus enablingcost effective bearing arrangements tobe made.

For many years SKF has been oneof the leading suppliers of variousdesigns of split plummer block hous-ings, including the SD plummer blockhousings – synonymous with opera-tional reliability and quality.

SNL 30 and SNL 31plummer block housingshave more to offerSKF plummer block housings of theSD design are currently being redesign-ed to take advantage of the progressembodied in the smaller SNL housings.The new plummer block housings ofseries SNL 30 and SNL 31 will gradu-ally replace the SD housings and arealso referred to as “Large SNL plum-mer block housings”.

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The new SNL plummer block hous-ings enable the full service life poten-tial of the incorporated bearings to beexploited with less need of mainten-ance. This supports user efforts tofurther reduce maintenance costs.Among other enhancements the SNLhousings have a new external designfor easier alignment and handlingwhen mounting.

Another benefit is the choice of oil or grease lubrication for the bearingshoused in SNL plummer blocks. Arange of newly developed seals for oillubrication and rough environmentsmake for trouble-free operation.

1 Product information 2 Recommendations 3 Product data

Customer benefits Page ............. 10 Page ............. 30



The standard range will also coverhousings with drilled and tapped holesfor lubrication nipples. There are vari-ants to be drilled upon request for con-dition monitoring.

Series SNL 30 and SNL 31 plum-mer block housings are made of greycast iron and demonstrate the samehigh strength as the earlier SD hous-ings. Should, however, this strength beinadequate, dimensionally equivalentSNLD plummer block housings ofspheroidal graphite cast iron areavailable.

The large SNL and SNLD plummerblock housings are fully interchange-able with the earlier SD and SDD hous-ings. Their dimensions conform to ISO113:1999.

Several sealing optionsAn important advantage of the SNLplummer block housings is that theycan be fitted with different seals. Thestandard seals supplied by SKF for thelarge SNL 30 and SNL 31 series hous-ings comprise labyrinth seals andheavy-duty “taconite” seals as well asend covers. There is also an oil sealavailable but this sealing arrangementis supplied together with the housingas the housing has to be modified totake it.

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One basic design –many variantsLarge SNL plummer block housingsare primarily intended for sphericalroller bearings and CARB bearings.The housings are designed on a “build-ing block” principle. This enables amore generous choice of bearing,shaft mounting, seals and type oflubrication.

A building block systemThe basis of the original SNL plummerblock housing system consists of anumber of housings of the same de-sign but in different sizes. By combin-ing the housings with the differentstandard seals a wide variety of hous-ing variants, all belonging to the stan-dard range, can be supplied to coverthe majority of demands for plummerblocks.

When complete, the new range ofseries SNL 30 and SNL 31 will be avail-able for shafts having diameters of 150to 500 mm, inclusive. However, initiallythe range extends to shaft sizes up to300 mm; the larger sizes will graduallybecome available as design work iscompleted. The availability of housingsfor which only shaft size and designa-tions are given in the product tablesshould be checked before ordering.

Large SNL plummerblock housing withsealing options



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Design characteristics Page ............. 10 Page ............. 30

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� Reinforced square base Increased stiffness

� Enlarged contact area Reinforced housing base and improved heat flow

� Drilled and tapped Relubrication facility as standardholes with nipples

� Caps and bases Avoids mixing of caps and bases, permits traceabilityindividually marked

� Indications for holes to Simple and easy adaptation of standard housing to take other components individual application, easy attachment of condition

monitoring equipment

� Simple and reliable Simpler and more reliable mounting and maintenance

� Additional seals Extended range of use, longer bearing service lives

Costs and risks – at alow levelThe new SNL 30 and SNL 31 plummerblock housings represent a furtherdevelopment of the SD housings.These large SNL housings have sev-eral special features as well as sealingalternatives.

Reinforced square baseThe housing base is reinforced with wallsaround the holes for the attachment bolts inorder to provide improved seating on thebase plate. The attachment bolts can bepreloaded to give better location and can nolonger deform the housing base or housingbore.

00102008560010200856

Enlarged contact areaThe centre cross reinforcement of the hous-ing base enlarges the contact area betweenbase and base plate and allows for animproved heat flow from the bearing outerring to the base plate.

Drilled and tapped holesHousings have drilled and tapped holes asstandard in the cap. The holes are protect-ed by metallic plugs. Two nipples are sup-plied, together with nipple protecter andadapter, with the housing (packed inside). If the application is such that relubrication isrequired it is only necessary to screw thenipples into the holes and lubricant can besupplied to one side of the bearing or in theW33 groove. There are also indications onthe housing where holes can be drilled forlubrication of the seals.

Caps and bases individually markedThe housing base and cap are matchedduring manufacture and are not inter-changeable with the caps and bases ofother housings. To prevent mixing caps and bases when mounting several hous-ings, the same consecutive number is marked on the cap and base of each individual housing.


Design characteristics Page ............. 10 Page ............. 30

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Indications for holes to take other componentsSNL housings can be fitted with sensorsserving permanently installed conditionmonitoring equipment based on vibrationmeasurements. The positions where holescan be drilled to take these sensors areindicated on the housing.

Simpler and saferIn order to simplify mounting and make alignment more accurate, cast indications,which are vertical to the centre of the boreof the housing, are provided on the sidefaces of the housing base. Cast indicationson the end faces of the base show thecentre of the bearing.

Additional sealsTwo new seal designs have been de-veloped specifically for SNL housings. One is intended for difficult conditions that call for a robust seal which can berelubricated and the other is for highspeeds and oil lubrication.


All branches of industry Page ............. 10 Page ............. 30

One important reason for the popu-larity of SKF housings is the increasedawareness of the impact of enhancedquality on the cost of a machine and its total life.

Industry

� Materials handling� Handling systems� Mining and construction� Fluid machinery� Metallurgical� Pulp and paper

High performance for allsectorsHigh load carrying capacity and reli-ability, easy maintenance, the varietyof applications and robust designs havemade SKF housings a must. The mostimportant sectors of industry and theirdemands are listed below.

Demands

� Long service life� Robust design� Long relubrication intervals� Ready for relubrication� Condition monitoring facilities� Avoid risk of mixed caps� Fast and easy mounting and

dismounting

Solution


All branches of industry Page ............. 10 Page ............. 30

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Page ............. 3 Types of arrangement Page ............. 30

Bearing arrangement design

SNL 31SNL 30

231 CCK230 CCK C 30 K C 31 K

� Bearing radial clearance can beadjusted within certain limits duringmounting to meet applicationdemands

Applications� Bearing arrangements for relatively

long shafts where more than twobearings are required for support

� Bearing arrangements wheremachine components are mountedusing wedging or tensioning compon-ents which do not require the shaftto be machined

� Bearing arrangements where thefinal position of the bearing cannotbe accurately determined

1. Bearings on adaptersleeves on smoothshafts

Advantages� Shafts with diameter tolerance h9

can be used without machining� Maximum shaft strength as there is

no weakening by shoulders or reliefs� Bearings can be mounted at any

position on the shaft� Mounting force, i.e. the force required

to drive up the bearing on to thesleeve, is some 40 % smaller thanwith other bearing arrangements onsleeves because friction occurs onlyin one contact

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Large SNL plummer block housings ofseries SNL 30 and SNL 31 can be usedwith spherical roller bearings or CARBbearings fitted on smooth (plain) orstepped shafts; the bearings can bemounted on adapter sleeves or directlyon cylindrical shaft seatings.

Bearings onadapter sleeveson smooth shafts


Page ............. 3 Types of arrangement Page ............. 30

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Applications� Bearing arrangements where large

numbers of bearings have to bemounted

� Bearing arrangements where heavyshock loads can occur

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2. Bearings on cylindrical seatings on stepped shafts

Advantages� The axial load carrying capacity of

the bearings (in both directions) isnot limited by a sleeve

� The residual bearing internal clear-ance is determined by the toleranceof the shaft seating so there is nodanger of radially preloading thebearing during mounting

� The bearing position on the shaft isaccurately determined by the shaftshoulder

� The bearing can be supported byother components via spacer sleeves

� The shaft diameter at the bearingposition is maximised

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SNL 31 GSNL 30 G

231 CC230 CC 240 CC C 30 C 31

Bearings oncylindricalseatings onstepped shafts


Page ............. 3 Standard seals Page ............. 30

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TS .. TNF .. TSD .. U1)

Properties

Temperature, °C −50 to +200 −40 to +100 −50 to +200

Peripheral speed, m/s ++ ≤ 12 ++

Misalignment, degrees ≤ 0,3 ≤ 0,3 ≤ 0,3

Grease relubrication + + -

Oil lubrication - - ++

Low friction ++ + ++

Axial shaft displacement + + -

Vertical arrangement -- - --

Sealing ability against

Dust + ++ +

Fine particulate contaminants + ++ +

Coarse particulate contaminants + ++ +

Abrasive contaminants ++ ++ ++

Liquids when sprayed -- ++ -

Direct sunlight ++ ++ ++

Symbols: ++ very suitable+ suitable- limited suitability-- unsuitable

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presented in Table , which gives acomprehensive overview of the sealtypes, their design features and theirsuitability for various operating con-ditions. Detailed information on thevarious standard and special sealsincluding properties and availability will be found on pages 13 to 15.

1Standard sealsThe standard seals available from SKFfor large SNL housings (series SNL 30and SNL 31) are one-piece labyrinthseals and the heavy-duty “taconite”seals. The seals are easy to install andare supplied separately.

The standard seals as well as theseals for use with oil lubrication are

Seal selection

Table

1) The oil seals are supplied together with housings prepared for oil lubrication. Oil seals can be ordered separatelyas spares only



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Taconite heavy-duty sealsTaconite is a very fine-grained mineralwhich is extremely difficult to sealagainst. For bearing arrangementswhich must operate under very arduousconditions such as those encounteredin mining, labyrinth seals which can be relubricated are recommended, asgrease enhances the sealing effectand extends the serviceability of theseals. SKF has developed a heavy-duty seal (which can seal against taco-nite, hence the name) which can besupplied for use with SNL housings.

The taconite seal design (➔ fig )is based on a labyrinth sealwith thelabyrinth stages arranged axially andfits the standard housings. A V-ringseal mounted on the shaft seals againstthe non-rotating part of the seal, whichis inserted in the seal groove and pre-vents contaminants from penetrating tothe bearing when the seal is relubric-ated. This grease is supplied via a

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grease nipple on the non-rotating partof the seal. Angular misalignments ofthe shaft of up to approximately 0,3°are possible.

The permissible operating temperat-ure range for the seal is between −40and +100 °C. Please contact SKF forapplications above 100 °C. The rubberO-ring and V-ring limit the operatingtemperature to 100 °C. However, SKFcan supply high temperature O-ringsand V-rings made of fluoro rubber foroperation at higher temperatures.

The axial movement of the shaftrelative to the housing is limited for this type of taconite seal to approxim-ately ±2 mm for sizes from 150 up to200 mm and ±4 mm for larger shaftdiameters.

These seals are supplied singly so that for housings used on throughshafts, it is necessary to order twoseals. The seal is identified by the pre-fix TNF followed by the size identifica-tion, e.g. TNF 34.

Labyrinth sealsThe labyrinth rings (➔ fig ) are madeof cast iron and have three radially ar-ranged labyrinth steps which form anarrow sealing gap with the housinggrooves.

Hollow O-ring cords of silicone rubber(supplied with the seals) ensure that thelabyrinth rings, which are mounted witha loose fit, rotate with the shaft. Angularmisalignments of the shaft up to approx-imately 0,3° are permissible. The oper-ating temperature range for the laby-rinth seals is −50 to +200 °C.

When labyrinth seals are used, axialmovement of the shaft relative to thehousing is not limited.

The labyrinth seals are suppliedsingly. For bearing arrangements forthrough shafts it is therefore necessaryto order two rings. The labyrinth seal isidentified by the prefix TS followed bythe size identification, e.g. TS 34.

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2

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Labyrinth seal Taconite heavy-duty seal

1Fig Fig



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Housing DimensionsSize A3 A4 A5 A6 Db Dc Dd

– mm

SNL 3036 158 11 5,5 22 181,2 196,4 205,2SNL 3038 168 11 5,5 22 191,4 206,4 215,4SNL 3040 186 11 5,5 22 201,4 216,4 225,4

SNL 3044 206 11 5,5 22 221,4 236,4 245,4SNL 3048 214 11 5,5 22 241,4 256,4 265,4SNL 3052 231 11 5,5 22 261,6 276,6 285,6

SNL 3056 249 11 5,5 22 281,6 296,6 305,6SNL 3060 249 11 5,5 22 301,6 316,6 325,6SNL 3064 279 11 5,5 22 321,8 336,8 345,8

SNL 3068 299 11 5,5 22 341,8 356,8 365,8SNL 3072 297 11 5,5 22 361,8 376,8 385,8SNL 3076

SNL 3080SNL 3084SNL 3088

SNL 3092SNL 3096SNL 30/500

SNL 3134 159 11 5,5 22 171,2 186,4 195,2SNL 3136 169 11 5,5 22 181,2 196,4 205,2SNL 3138 187 11 5,5 22 191,4 206,4 215,4

SNL 3140 207 11 5,5 22 201,4 216,4 225,4SNL 3144 215 11 5,5 22 221,4 236,4 245,4SNL 3148 231 11 5,5 22 241,4 256,4 265,4

SNL 3152 249 11 5,5 22 261,6 276,6 285,6SNL 3156 249 11 5,5 22 281,6 296,6 305,6SNL 3160 280 11 5,5 22 301,6 316,8 325,6

SNL 3164 300 11 5,5 22 321,8 336,8 345,8SNL 3168SNL 3172

SNL 3176SNL 3180SNL 3184

SNL 3188SNL 3192SNL 3196

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DDD

A5

A4

A6

A3

db c

Table

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Seals for oil lubricationSpecial seals (oil seals) are required to prevent oil from escaping from thehousing when oil lubrication is applied.For SNL housings, SKF has developedthe non-rubbing seal of the U design(➔ fig ). These U seals requiremodified housings and comprise twoparts: one which is stationary and fittedin the modified seal groove and theother which is mounted on the shaftand rotates. The hollow O-ring cords ofsilicone rubber inserted between thelabyrinth ring and the shaft ensure thatthe ring, which is mounted with a loosefit, rotates with the shaft, and oil can-not escape along the shaft. These oilseals do not limit axial movement ofthe shaft relative the housing.

The modified SNL housing is sup-plied together with the seals as a unit.The housings with seals are identifiedby the suffix TURT (TURA for CARBbearings) e.g. SNL 3134 TURT. Theseal itself is designated TSD .. U.

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Oil seal

Fig

For SNL 3076 to SNL 30/500 and SNL 3168 to SNL 3196, inclusive, please consult SKF


Page ............. 3 Special seals Page ............. 30

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Housing DimensionsSize A3 A4 A5 A6 Db Dc Dd

– mm

SNL 3036 G 156 11 5,5 22 221,4 236,4 245,4SNL 3038 G 166 11 5,5 22 221,4 236,4 245,4SNL 3040 G 184 11 5,5 22 241,4 256,4 265,4

SNL 3044 G 203 11 5,5 22 261,6 276,6 285,6SNL 3048 G 211 11 5,5 22 281,6 296,6 305,6SNL 3052 G 228 11 5,5 22 301,6 316,8 325,6

SNL 3056 G 247 11 5,5 22 321,8 336,8 345,8SNL 3060 G 247 11 5,5 22 341,8 356,8 365,8SNL 3064 G 277 11 5,5 22 361,8 376,8 385,8

SNL 3068 G 295 11 5,5 22 381,8 396,8 405,8SNL 3072 G 293 11 5,5 22 401,8 416,8 425,8SNL 3076 G

SNL 3080 GSNL 3084 GSNL 3088 G

SNL 3092 GSNL 3096 GSNL 30/500 G

SNL 3134 G 157 11 5,5 22 201,4 216,4 225,4SNL 3136 G 166 11 5,5 22 221,4 236,4 245,4SNL 3138 G 185 11 5,5 22 221,4 236,4 245,4

SNL 3140 G 204 11 5,5 22 241,4 256,4 265,4SNL 3144 G 213 11 5,5 22 261,6 276,6 285,6SNL 3148 G 230 11 5,5 22 281,6 296,6 305,6

SNL 3152 G 248 11 5,5 22 301,6 316,8 325,6SNL 3156 G 248 11 5,5 22 321,8 336,8 345,8SNL 3160 G 278 11 5,5 22 341,8 356,8 365,8

SNL 3164 G 297 11 5,5 22 361,8 376,8 385,8SNL 3168 GSNL 3172 G



3 Special sealsIn applications where, for some reason or other, the standard seals cannot beused, special seals must be fitted. TheSNL housings can be supplied withoutseals for such applications and arerelatively easy to equip with specialseals. It is recommended that housingsof series SNL .. G are used rather thanthose of series SNL as they have acomparatively larger bore at the shaftentrance. There is therefore more roomto accommodate a seal, so that thereis more choice as regards seal design.

Special seals are not normally sup-lied by SKF. Therefore, the relevanthousing dimensions are given inTables and .32

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Table

DDD

A5

A4

A6

A3

db c

Sealing groove dimensionsFor SNL 3076 G to SNL 30/500 G and SNL 3168 G to SNL 3196 G, inclusive, please consult SKF


Page ............. 3 End covers Page ............. 30

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Housing Bearing DimensionsSize ba ba bb bc

min max1)

– – mm

SNL 3036 23036 72 102 66,5 107,524036 85 102 79,5 107,5

SNL 3038 23038 73 108 68 113,524038 86 108 80,5 113,5

SNL 3040 23040 78 112 72,5 117,524040 91 112 86 117,5

SNL 3044 23044 91 122 86 127,524044 105 122 100 127,5

SNL 3048 23048 97 128 92 133,524048 110 128 105 133,5

SNL 3052 23052 103 136 98 141,524052 121 136 116 141,5

SNL 3056 23056 108 146 103 151,524056 125 146 120 151,5

SNL 3060 23060 118 149 113 154,524060 139 149 134 154,5

SNL 3064 23064 121 170 115,5 175,524064 140 170 135 175,5

SNL 3068 23068 130 181 124,5 186,524068 153 181 148 186,5

SNL 3072 23072 130 181 125 186,524072 153 181 148 186,5

SNL 3076 2307624076

SNL 3080 2308024080

SNL 3084 2308424084

SNL 3088 2308824088

SNL 3092 2309224092

SNL 3096 2309624096

SNL 30/500 230/500240/500

SNL 3134 23134 78 102 73 107,5SNL 3136 23136 83 108 78 113,5SNL 3138 23138 88 112 83 117,5

SNL 3140 23140 93 122 88 127,5SNL 3144 23144 100 128 95 133,5SNL 3148 23148 106 136 101 141,5

SNL 3152 23152 116 146 111 151,5SNL 3156 23156 119 149 114 154,5SNL 3160 23160 138 170 133 175,5

SNL 3164 23164 149 181 144 186,5SNL 3168 23168SNL 3172 23172

SNL 3176 23176SNL 3180 23180SNL 3184 23184

SNL 3188 23188SNL 3192 23192SNL 3196 23196

Permissible length of shaft end

bb

bb

a

c

bb

bb

a

c

Table 4

1) For non-locating arrangements which are not mounted centrally in the bearing seating, the value of ba max must becorrespondingly reduced



Page ............. 3 End covers, locating rings Page ............. 30

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2

4

Locating ringsThe bearing seating in the housing issufficiently wide to enable the bearingto be displaced axially. Bearings whichare to locate a shaft axially in bothdirections (locating bearings) mustalways be fixed axially in position inthe housing bore by locating rings atboth sides (➔ fig ).

CARB bearings are non-locatingbearings and cannot take axial loads.Since axial displacement is accommod-ated within a CARB bearing (togetherwith any misalignment) it is necessaryto locate the outer ring axially in itsseating by inserting locating rings ateach side of the bearing.

The locating rings are identified bythe prefix FRB followed by figuresgiving the width/outside diameter inmillimetres, e.g. FRB 10/280.

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End coversFor housings mounted at the ends of shafts, the one opening should befitted with an end cover which fits intothe seal groove (➔ fig ). Details ofthe permissible length of the shaft endcan be found in Table . The endcovers are of cast iron and are insertedwith a hollow O-ring cord of siliconerubber in the seal groove in the hous-ing. The end covers are suitable foroperating temperatures in the range–50 to +200 °C.

The standard end cover is desig-nated by the prefix ETS followed by thehousing size identification, e.g. ETS 34.End covers for oil lubricated SNLhousings are identified by suffix R, e.g. ETS 34 R.

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4

5Fig Fig

Housing with end coverHousing with locating rings at bothsides of bearing


Page ............. 3 Trouble-free operation Page ............. 30

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Application advice for trouble-free operation

Condition monitoring is recommendedfor SNL plummer blocks particularly if they are used on machines wherefailures would cause production stop-pages. The early recognition and trend-ing of the degradation of the machineand machine parts make it possible toanalyse the cause and to be able toplan for corrective maintenanceactions in good time.

Extensive monitoring experienceand a knowledge of the dynamic be-haviour of machines, machine com-ponents and bearings where there is incipient damage allows SKF to recom-mend two powerful signal processingtechniques which can be used for condition monitoring.

Vibration velocityThe RMS (root mean square) of thevelocity of vibrations in the frequencyrange 10 Hz to 1 kHz has been usedwith great success to measure pheno-mena such as imbalance, misalign-ment, resonance etc. High levels ofvelocity vibration can be generated bypoor machine conditions such as im-proper clearances, imbalance, misalign-ment, weak foundations, bent rotors,out-of-round, belt problems or dam-aged fan blades. The ISO Standard 10816-1:1995 contains recommenda-tions for reference values for the RMSvelocity values measured on differentclasses of machines and machineparts. These recommendations give aclear and quantifiable measure for thechanges in machine condition. Vibrationvelocity expressed as an overall RMSvalue in the 10 Hz to 1 kHz frequencyrange provides minimal information ondefects in rolling element bearings orgear mesh problems. These types ofdefect can now be easily detected byenveloped acceleration in the higherfrequency ranges.

Enveloped accelerationBearing defects can be easily recog-nised by measurement and analysis of an enveloped acceleration signal of

the higher frequencies generated bythe impact signals typical of rollingbearing defects and gear teeth prob-lems. This technique has proved to be

Electronic cabinetwith built-inMCM™ units

Multilog on-linesystem

Microlog –portable datacollector andanalyser


Page ............. 3 Trouble-free operation Page ............. 30

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Measurement point 2 should be usedon SNL housings where the load actstowards the base plate. Measurementpoint 1 is intended for when the housingis hung from its support or when theload acts away from the base plate.

For additional information about condition monitoring and the measure-ment tools and systems available fromSKF please contact the SKF applica-tion engineering service.

extremely reliable in the detection ofincipient bearing defects. The low fre-quencies generated by imbalance,misalignment etc. are not measuredand diagnosed within the envelopedacceleration process.

� Condition monitoring and diagnosiswith permanently installed monitor-ing systems

This type of monitoring makes it possible to check the condition using MCM™ (Mechanical Condi-tion Monitor) for a single measuringpoint or the multilog LMU (LocalMonitoring Unit) which sequentiallymonitors several measuring points.The MCM™ system should be ap-plied were an economical solution isrequired (e.g. for fans). The measure-ment output can be directly connect-ed to a control or DCS (Digital Con-trol System). A relay output is alsoavailable to shut down the machineor section of the plant.

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� Condition monitoring and diagnosiswith a portable data collector andanalyser

In this case the condition is monitor-ed using a portable data collector/analyser at appropriate points on themachine. Where a measurementpoint is difficult to access, perman-ently installed sensors can be used.These can be connected by cable to a connection box accessible tothe data collector.

Condition monitoring of large SNLhousingsSNL housings have appropriate pointsfor sensors (➔ fig ). Measurementpoints 1 and 2 are perpendicular to theshaft and correspond best to ISO10816-1:1995.

1

1Fig

Measurement points for condition monitoring

Position 1: optimum sensorposition for vertical or hangingposition of bearing housing.Position 1 can be used foracceleration enveloping andalso is a position identifiedaccording to ISO 10816-1.

Position 2: optimum sensorposition for measurementsconcerning the ISO 10816-1standard and also for accel-eration enveloping for forcesperpendicular to the shaftcentreline.


Page ............. 3 Lubrication Page ............. 30

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Housing Grease quantitiesSize First Relub-

fill1) rication

– kg

SNL 3036 1,2 0,10SNL 3038 1,5 0,11SNL 3040 1,9 0,13

SNL 3044 2,4 0,15SNL 3048 2,8 0,17SNL 3052 3,6 0,21

SNL 3056 4,5 0,22SNL 3060 4,6 0,27SNL 3064 6,5 0,29

SNL 3068 8,1 0,35SNL 3072 8,1 0,36SNL 3076

SNL 3080SNL 3084SNL 3088

SNL 3092SNL 3096SNL 30/500

SNL 3134 1,1 0,12SNL 3136 1,4 0,14SNL 3138 1,8 0,17

SNL 3140 2,3 0,19SNL 3144 2,7 0,22SNL 3148 3,4 0,26

SNL 3152 4,3 0,32SNL 3156 4,4 0,34SNL 3160 6,2 0,40

SNL 3164 7,7 0,48SNL 3168SNL 3172

SNL 3176SNL 3180SNL 3184

SNL 3188SNL 3192SNL 3196

1

the position for lubrication holes for theseals.

A grease nipple AH 1/8-27 PTF issupplied with the housing. The greasenipple kit also contains a plastic grease nipple protector, a grease nippleM1 G 1/8 and an adapter LAPN 1/8.This adapter transforms the standarddrilled 1/8-27 NPSF thread to a G 1/4which enables the use of grease lubri-cators such as SKF SYSTEM 24.

It is recommended that spherical roller bearings having a lubricationgroove and three holes in the outerring (designation suffix W33) be lubri-cated via this feature (➔ fig ). In thiscase the relubrication hole in the baseor in the centre of the cap should beused.

It should be noted that when spher-ical roller bearings are to be relubric-ated via the outer ring, they should berotated. If outer ring relubrication is notpossible or if CARB bearings are usedthe standard grease nipple suppliedwith the housing should be inserted inthe hole on the side of the cap andused for this purpose (➔ fig ). If it is desired to use a grease nipple otherthan that supplied with the housing,adapters are available which make areworking of the available drilled andtapped hole unnecessary.

4

3

LubricationSNL plummer block housings are sodesigned that the bearings in them can be lubricated with grease or oil,although grease lubrication is gener-ally preferable. The lubricant should be selected with reference to the oper-ating conditions. Relevant informationwill be found in the SKF General Cata-logue and other SKF publications.

Grease lubricationIn the majority of applications, theamount of grease applied to the SNLhousings when mounting (first fill) orafter an inspection is adequate untilthe next planned inspection.

Certain operating conditions, e.g.high speeds, high temperatures orheavy loads, may mean that more frequent relubrication is necessary.Table gives guideline values for the grease quantities to be applied forthe first fill and for relubrication.Markings in each corner inside thebase give an indication of the greaselevel for the first fill (➔ fig ).

There are three drilled and tappedholes for a grease nipple AH 1/8-27 PTFin the housing: two in the cap and onein the base. These holes are closed bymetallic plugs. The two markings at theouter sides of the central ridge indicate

2

1

Lubricating the bearing via the outer ring Grease level markings for first fill

3Fig

Table

Grease quantities

2Fig

1) Fills approximately 40 % of the free space in thehousing

For SNL 3076 to SNL 30/500 and SNL 3168 toSNL 3196, inclusive, please consult SKF


Page ............. 3 Lubrication Page ............. 30

21

Housing DimensionsSize Ja J7 N3

– mm

SNL 3036 105 34 30SNL 3038 110 38 30SNL 3040 120 36 30

SNL 3044 120 36 30SNL 3048 130 42 40SNL 3052 145 43 40

SNL 3056 150 44 40SNL 3060 165 51 40SNL 3064 180 53 40

SNL 3068 180 53 40SNL 3072 180 53 40SNL 3076

SNL 3080SNL 3084SNL 3088

SNL 3092SNL 3096SNL 30/500

SNL 3134 105 34 30SNL 3136 110 38 30SNL 3138 120 36 30

SNL 3140 120 36 30SNL 3144 130 42 40SNL 3148 145 43 40

SNL 3152 150 44 40SNL 3156 165 51 40SNL 3160 180 53 40

SNL 3164 180 53 40SNL 3168SNL 3172

SNL 3176SNL 3180SNL 3184

SNL 3188SNL 3192SNL 3196

2 Recommended dimensions for greaseescape holes

2

5

Where the bearings are mounted onadapter sleeves, the grease should beintroduced at the side opposite to thelock nut of the sleeve.

If frequent relubrication is required, it is advisable to provide the housingwith grease escape holes (➔ fig )through which excess grease canescape. Recommended dimensionswill be found in Table . SNL housingswith grease escape holes in the basecan be supplied. This housing designis identified by the suffix V, e.g. SNL3134 V.

SNL housings can also be equippedwith grease lubricators. Recommendedare the SKF SYSTEM 24 lubricators(e.g. LAGD 125/WA2) which provide areliable alternative to manual relubrica-tion.

2

5

Housing with grease escape holes

Fig

Table

J

JN

a Ja

3

7

4Fig

Lubricating the bearing from the side

The dimensions are those recommended when the standard grease nipple AH 1/8-27 PTF is used(supplied with the housing) but can also be applied ifnipples having threads R 1/8, KR 1/8, M 10×1 or G 1/4(with adapter LAPN 1/8) are used. The recommenda-tions also apply if grease dispensers, e.g. SKFSYSTEM 24, are used.

For SNL 3076 to SNL 30/500 and SNL 3168 toSNL 3196, inclusive, please consult SKF


Page ............. 3 Lubrication, mounting Page ............. 30

22

6

MountingSNL housings together with SKF bearings are robust and operationallyreliable bearing arrangements whichhave long lives. However, if they are to achieve their full potential and notfail prematurely, they must be properlymounted. Incorrect procedures orunsuitable tools can influence life negatively.

When mounting the housings itshould be remembered that the hous-ings are asymmetrical internally andtherefore the bearings are not alwaysmounted in the centre of the housing.

Vertical markings on the housingbase end faces indicates the locationof the centre of the bearing seating.

Mounting the bearingThe bearings can be mounted eitheron a tapered seating – normally forSNL housings in the form of an adap-ter sleeve – or on a cylindrical seating.When a bearing is correctly mountedon a sleeve there will be interferencefits between the inner ring, sleeve andshaft. The degree of interference isdetermined by how far the bearing isdriven up on the sleeve and either theinternal clearance reduction or theaxial drive-up distance can be used asa measure. The clearance reduction inspherical roller bearings can be meas-ured using a feeler gauge, or the SKFdrive-up method can be used. Informa-tion will be sent on request.

For CARB bearings either the clear-ance reduction or the axial drive-updistance should be measured. Whenusing a feeler gauge to measure clear-ance reduction it is important that theinner and outer rings of the bearing arenot displaced with respect to eachother. The SKF drive-up method canalso be applied.

Adapter sleeves with the designationOH .. H in the product tables indicatethat the sleeves are provided with thenecessary ducts to enable the bearingsto be mounted using the oil injectionmethod. Oil is supplied to the nut sideof the sleeve.

Bearings with cylindrical bore arenormally mounted with an interferencefit on the shaft. Appropriate shaft toler-ances should be selected (➔ SKFGeneral Catalogue). The recommenda-

Housing for oil lubrication

Fig

Oil lubricationThe new SNL 30 and SNL 31 housingscan be used for oil lubrication at relat-ively high speeds. When using oil,however, the specially developed U-design seals should be incorporated to avoid oil loss from the housing (➔ fig ). These seals are describedon page 14. In order for these seals tobe used, the housing must be modifiedso that SNL housings for oil lubricationare only supplied complete with seals.

Oil lubricated SNL housings canalso be equipped with oil levellers,LAHD series, which are designed forautomatic adjustment of the optimal oillubrication level within the bearinghousing.

6


Page ............. 3 Mounting Page ............. 30

23

Housing Dimensions Housing DimensionsSize J6 N4 Size J6 N4

max max

– mm – mm

SNL 3036 470 20 SNL 3134 470 20SNL 3038 490 20 SNL 3136 490 20SNL 3040 520 20 SNL 3138 520 20



SNL 3068 830 25 SNL 3164 830 25SNL 3072 830 25 SNL 3168SNL 3076 SNL 3172

SNL 3080 SNL 3176SNL 3084 SNL 3180SNL 3088 SNL 3184

SNL 3092 SNL 3188SNL 3096 SNL 3192SNL 30/500 SNL 3196

3

Dowel pinsSNL housings are designed for loadsacting vertically to the housing basesupport. If they are to be subjected tomoderate or heavy loads acting paral-lel to the base support, a stop shouldbe provided, or the housing should bepinned to its support. Recommenda-tions for the position and size of holesto take dowel pins are given in Table .3

tions applying to spherical roller bear-ings also apply to CARB bearings.

Details of mounting tools as well asthe SKF drive-up method can be foundon the SKF CD-ROM MP282 which willbe sent on request.

Support surface for housing baseTo guarantee long bearing service lifeit is recommended that the supportsurface for the housing is finished toRa � 12,5 µm. The flatness (planicity)tolerance should be to IT7. For moder-ate demands IT8 may be satisfactory.

2

Position and size of dowel pin holes

NJ6

4

Table

Attachment boltsIt is recommended that hexagon headed bolts to strength class 8.8according to the European StandardEN 24014 should be used. If the loaddoes not act vertically to the base, itmay be necessary to use stronger,class 10.9 bolts. Details of the appro-priate tightening torques for the boltsto class 8.8 are given in Table onpage 32.

2




24

9. Put the locating ring(s) (whenneeded) at each side of the bearing.

NB. Locating rings are only used forlocating bearing arrangements, exceptfor CARB bearings which, althoughalways non-locating, must always bemounted with locating rings.

10. Carefully align the housing base.Vertical markings on the housing baseends and side faces showing the bear-ing seating centre can facilitate this.Then lightly tighten the attachmentbolts.

11. The housing cap should be placedover the base and the cap bolts (to joincap and base) tightened to the torquespecified in Table on page 32. The cap and base of one housing arenot interchangeable with those of otherhousings. The cap and base should bechecked to see that they bear thesame consecutive number.

12. Fully tighten the attachment boltsin the housing base. Recommendedtightening torques are given in Table on page 32.

13. Finally insert the hollow O-ringcords of synthetic rubber in the groovesin the labyrinth rings. This can be doneusing a screwdriver while turning theshaft.

2

2

Mounting SNL 30 andSNL 31 housings withlabyrinth sealsBefore starting installation work, thefollowing instructions should be care-fully read.

1. Ensure that the environment is clean.Check the dimensional and form accur-acy of the shaft seating.

2. Check that the surface roughness of the support surface Ra � 12,5 µm.The flatness (planicity) toleranceshould be to IT7. For moderatedemands IT8 may be satisfactory.

3. If the bearing is mounted on anadapter sleeve, determine the positionof the housing. The grease nipplearranged at one side of the housingcap (for improved lubrication) shouldalways be at the side opposite to thesleeve nut. It is necessary to considerthe complete housing as the base andcap will only fit together as supplied.

4. Position the housing on the supportsurface. Fit the attachment bolts but do not tighten them.

5. Mount the first labyrinth seal on theshaft in the correct position.

6. Mount the bearing on the shaft – either directly on a stepped shaft orusing an adapter sleeve. Completelyfill the bearing with grease. The hous-ing base should be filled with greaseup to the markings in each corner in-side the base (➔ Table , page 20).

7. Mount the second labyrinth ring onthe shaft in the correct position. If thehousing is to be used at a shaft end,the second labyrinth ring is omittedand an end cover inserted in the housing base instead.

8. Lay the shaft with bearing and laby-rinth ring(s) in the housing base.

1



25

2

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56

GREASE

LGMT 2

00102008

56

00102008

56

00102008

56

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0001 S2

7

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56

0010200856

4

4

5

6

9

9

8

10

11

12

13

7



26

9. Lay the shaft with bearing and sealsin the housing base taking care thatthe O-rings are not damaged.


NB. Locating rings are only used forlocating bearing arrangements, exceptfor CARB bearings which, althoughalways non-locating, must always bemounted with locating rings.


12. The housing cap should be placedover the base, taking care that the O-rings are not damaged, and the capbolts (to join cap and base) tightenedto the torque specified in Table onpage 32. The cap and base of onehousing are not interchangeable withthose of other housings. The cap andbase should be checked to see thatthey bear the same consecutive num-ber.

13. Fully tighten the attachment boltsin the housing base. Recommendedtightening torques are given in Table on page 32.

14. Adjust the flingers to the correctposition and tighten the grub screws.The clearance in the seal must exceedthe axial movement of the bearing.

15. Finally, before the first test run,rotate the shaft and supply grease via the nipple until it exudes from thelabyrinth rings. The same grease asthat used for the bearing should alsobe used to lubricate the labyrinth rings.

2

2

Mounting SNL 30 andSNL 31 housings withtaconite sealsBefore starting installation work, thefollowing instructions should be care-fully read.



3. If the bearing is mounted on anadapter sleeve, determine the positionof the housing. The grease nipplearranged at one side of the housingcap (for improved lubrication) shouldalways be at the side opposite to thesleeve nut. It is necessary to considerthe complete housing as the base andcap will only fit together as supplied.


5. Slide the parts for the first seal tothe correct position on the shaft. Thelip of the V-ring should point towardsthe bearing. Do not tighten the grubscrews.

6. Mount the bearing on the shaft – either directly on a stepped shaft orusing an adapter sleeve. Completelyfill the bearing with grease. The hous-ing base should be filled with greaseup to the markings in each corner in-side the base (➔ Table , page 20).

7. Mount the second seal according topoint 5. If the housing is to be used ata shaft end, the second seal is omittedand an end cover inserted in the hous-ing base instead.

8. Check that the O-ring is in thecorrect position on the seal outsidediameter.

1



27

2

00102008

56

GREASE

LGMT 2

00102008

560010

200856

0001 S2

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00102008

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4

4 7

6

9

11

12

15

1010

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13



28


11. Cover the mating surfaces of thehousing with oil-resistant sealant,place the housing cap over the baseand tighten the cap bolts to the torquespecified in Table on page 32. The cap and base of one housing arenot interchangeable with those of otherhousings. The cap and base should be checked to see that they bear thesame consecutive number.

12. Fully tighten the attachment boltsin the housing base. Recommendedtightening torques are given in Table on page 32.2

2

Mounting SNL 30 andSNL 31 housings withoil sealsBefore starting installation work, thefollowing instructions should be care-fully read.



3. If the bearing is mounted on anadapter sleeve, determine the positionof the housing. It is necessary to con-sider the complete housing as thebase and cap will only fit together assupplied.


5. Cover the shaft with a thin layer ofoil. Slide the parts for the first seal tothe correct position on the shaft.

6. Mount the bearing on the shaft – either directly on a stepped shaft orusing an adapter sleeve.

7. Slide the parts for the second sealto the correct position on the shaft.Keep the locating pin in the outer sealparts in a horizontal position.

8. Lay the shaft with bearing and sealparts in the housing base.


NB. Locating rings are only used forlocating bearing arrangements, exceptfor CARB bearings which, althoughalways non-locating, must be mountedwith locating rings.



29

2

4

47

6

99

8

11

12

10

5


Page ............. 3 Page ............. 10 Designation chart

30

Basic design

Material

– Housing of grey cast ironD Housing of spheroidal graphite cast iron

Size

e.g. 3134

Suffixes

– Housing for bearing with adapter sleeve and through shaftG Housing for bearing with cylindrical bore and for stepped shaftA Housing for shaft end, with end cover at one sideTS Housing with labyrinth seal(s)TNF Housing with taconite seal(s)V Housing with grease escape holes in baseT Drilled and tapped hole 1/8-27 NPSF at one side of cap (opposite to lock nut) to take grease nipple

AH 1/8-27 PTF for relubrication of seals; nipple supplied with housingTD Drilled and tapped hole 1/8-27 NPSF at both sides of cap to take grease nipple AH 1/8-27 PTF

for relubrication of seals; two nipples supplied with housingSN Housing with drilled and tapped hole for sensorTURT Housing prepared for oil lubrication (spherical roller bearing) with seals TURA Housing prepared for oil lubrication (CARB bearing) with seals

nations needed to identify featureswhich differ from the standard design.A dash (−) in the chart indicates thatthe feature belongs to the standarddesign.

Designations and housing data

DesignationsThe designations used for SNL housingsconsist of a basic designation whichidentifies the design, material and sizefollowed by any supplementary desig-

Designation chart

3134 TSSNSNL D


Page ............. 3 Page ............. 10 Load carrying ability

31

Housing Breaking loads for SNL housingSize P55° P90° P120° P150° P180° Pa

– kN

SNL 3036 2 100 1 000 760 680 850 550SNL 3038 2 400 1 150 850 760 950 620SNL 3040 2 700 1 300 1 000 880 1 100 710

SNL 3044 3 200 1 600 1 100 1 000 1 300 840SNL 3048 4 000 1 900 1 400 1 300 1 600 1 000SNL 3052 4 200 2 000 1 500 1 400 1 700 1 100

SNL 3056 4 700 2 300 1 700 1 500 1 900 1 200SNL 3060 5 000 2 400 1 800 1 600 2 000 1 300SNL 3064 6 000 2 900 2 200 1 900 2 400 1 500

SNL 3068 7 000 3 400 2 500 2 200 2 800 1 800SNL 3072 7 000 3 400 2 500 2 200 2 800 1 800SNL 3076

SNL 3080SNL 3084SNL 3088

SNL 3092SNL 3096SNL 30/500

SNL 3134 2 100 1 000 760 680 850 550SNL 3136 2 400 1 150 850 760 950 620SNL 3138 2 700 1 300 1 000 880 1 100 710

SNL 3140 3 200 1 600 1 100 1 000 1 300 840SNL 3144 4 000 1 900 1 400 1 300 1 600 1 000SNL 3148 4 200 2 000 1 500 1 400 1 700 1 100

SNL 3152 4 700 2 300 1 700 1 500 1 900 1 200SNL 3156 5 000 2 400 1 800 1 600 2 000 1 300SNL 3160 6 000 2 900 2 200 1 900 2 400 1 500

SNL 3164 7 000 3 400 2 500 2 200 2 800 1 800SNL 3168SNL 3172

SNL 3176SNL 3180SNL 3184

SNL 3188SNL 3192SNL 3196

1Load carrying abilitySNL plummer block housings areintended for loads acting verticallytowards the base plate (support). Ifloads acting in other directions occur,checks should be made to ensure that the magnitude of the load is permissible for the housing, the boltsjoining the housing cap and base, and for the attachment bolts.

Load carrying ability of the housingGuideline values for the breaking load P of the housing for various loaddirections are given in Table . Usingthese values and a safety factor sel-ected with respect to the operatingconditions, the permissible load for the housing can be calculated. In general engineering a safety factor of 6 is often used.

For special purposes where extrastrength and resistance to shock loadsare required, SKF supplies as stand-ard a range of spheroidal graphite cast iron housings. Spheroidal graphitecast iron housings are designatedSNLD followed by the size identifica-tion, e.g. SNLD 3134. For housingsmade of spheroidal graphite cast ironthe values of P in Table should bemultiplied by 1,8.

It is important for the load carryingability of the housing that the bolts joining cap and base are properlytightened in accordance with the valuesgiven in Table . The axial load carry-ing capacity of the housing is approx-imately 65 % of P180°. For load anglesbetween 55 and 120° as well as foraxial loads, if the load acting parallel to the base plate (support surface)exceeds 5 % of P180°, the housingshould be pinned to the support or astop should be provided in the direc-tion of the load.

2

1

1

3

Breaking loads for SNL plummer blockhousings

PaP150° P180°

P55° P90° P120°

Table




32

Housing Cap bolts Attachment boltsSize Yield point Maximum load Tightening Designation Size Tightening

for four bolts for four bolts torque to EN 24014 torqueQ120° Q150° Q180° F120° F150° F180°

– kN kN Nm – – Nm

SNL 3036 1 800 1 040 900 760 440 380 350 M 24×140 M 24 750SNL 3038 1 800 1 040 900 760 440 380 350 M 24×140 M 24 750SNL 3040 1 800 1 040 900 760 440 380 350 M 24×150 M 24 750

SNL 3044 1 800 1 040 900 760 440 380 350 M 24×160 M 30 1 400SNL 3048 1 800 1 040 900 760 440 380 350 M 24×160 M 30 1 400SNL 3052 2 860 1 650 1 430 1 240 720 620 400 M 30×180 M 30 1 400

SNL 3056 2 860 1 650 1 430 1 240 720 620 400 M 30×200 M 36 2 400SNL 3060 2 860 1 650 1 430 1 240 720 620 400 M 30×200 M 36 2 400SNL 3064 2 860 1 650 1 430 1 240 720 620 400 M 30×220 M 36 2 400

SNL 3068 2 860 1 650 1 430 1 240 720 620 400 M 30×220 M 36 2 400SNL 3072 2 860 1 650 1 430 1 240 720 620 400 M 30×220 M 36 2 400SNL 3076

SNL 3080SNL 3084SNL 3088

SNL 3092SNL 3096SNL 30/500

SNL 3134 1 800 1 040 900 760 440 380 350 M 24×140 M 24 750SNL 3136 1 800 1 040 900 760 440 380 350 M 24×140 M 24 750SNL 3138 1 800 1 040 900 760 440 380 350 M 24×150 M 24 750

SNL 3140 1 800 1 040 900 760 440 380 350 M 24×160 M 30 1 400SNL 3144 1 800 1 040 900 760 440 380 350 M 24×160 M 30 1 400SNL 3148 2 860 1 650 1 430 1 240 720 620 400 M 30×180 M 30 1 400

SNL 3152 2 860 1 650 1 430 1 240 720 620 400 M 30×200 M 36 2 400SNL 3156 2 860 1 650 1 430 1 240 720 620 400 M 30×200 M 36 2 400SNL 3160 2 860 1 650 1 430 1 240 720 620 400 M 30×220 M 36 2 400

SNL 3164 2 860 1 650 1 430 1 240 720 620 400 M 30×220 M 36 2 400SNL 3168SNL 3172

SNL 3176SNL 3180SNL 3184

SNL 3188SNL 3192SNL 3196

2Table

Q150°F150°

Q120°F120°

Q180°F180°




33

Load carrying ability of boltsSNL plummer block housings are supplied with cap bolts (to join cap and base) to strength class 8.8 asstandard. The guideline values for theyield point Q for the cap bolts are givenin Table for various load directionsas well as the corresponding max-imum radial loads F.

2

3

Load carrying ability and tightening torques for cap bolts and attachmentbolts


Page ............. 3 Page ............. 10 Large SNL plummer block housingsfor bearings on adapter sleevesda 150–200 mm

34

Shaft HousingDimensions Mass Designations

Housing Componentsda A A1 H H1 H2 J J1 L N N1 s G complete with Housing only Seal End cover

two seals

mm mm kg –

150 230 180 333 170 70 430 100 510 34 28 14 24 69,5 SNL 3134 TS SNL 3134 TS 34 ETS 34SNL 3134 TNF SNL 3134 TNF 34 ETS 34SNL 3134 TURT – TSD 3134 U ETS 34 RSNL 3134 TURA – TSD 3134 U ETS 34 R


240 190 353 180 75 450 110 530 34 28 15 24 77,5 SNL 3136 TS SNL 3136 TS 36 ETS 36SNL 3136 TNF SNL 3136 TNF 36 ETS 36SNL 3136 TURT – TSD 3136 U ETS 36 RSNL 3136 TURA – TSD 3136 U ETS 36 R


260 210 375 190 80 480 120 560 34 28 10 24 97,5 SNL 3138 TS SNL 3138 TS 38 ETS 38SNL 3138 TNF SNL 3138 TNF 38 ETS 38SNL 3138 TURT – TSD 3138 U ETS 38 RSNL 3138 TURA – TSD 3138 U ETS 38 R


280 230 411 210 85 510 130 610 42 35 10 30 123 SNL 3140 TS SNL 3140 TS 40 ETS 40SNL 3140 TNF SNL 3140 TNF 40 ETS 40SNL 3140 TURT – TSD 3140 U ETS 40 RSNL 3140 TURA – TSD 3140 U ETS 40 R

200 280 230 411 210 85 510 130 610 42 35 10 30 123 SNL 3044 TS SNL 3044 TS 44 ETS 44SNL 3044 TNF SNL 3044 TNF 44 ETS 44SNL 3044 TURT – TSD 3044 U ETS 44 RSNL 3044 TURA – TSD 3044 U ETS 44 R


Labyrinth seals Taconite seals Oil sealsTS design TNF design TSD .. U design

Ca

H

H1

A

AA

daDa

1

2

s

A 3 A4


Page ............. 3 Page ............. 10

35

Shaft Bearing Width across seals Eye bolts Appropriate bearings and associated componentsseating according to Spherical roller bearing Adapter sleeve Locating rings

DIN 580 CARB bearingda Ca Da A2 A3 A4

mm mm mm – –

150 108 280 240 300 226 M 16 23134 CCK/W33 H 3134 2 FRB 10/280

160 108 280 240 310 226 M 16 23036 CCK/W33 H 3036 2 FRB 17/280C 3036 K H 3036 2 FRB 17/280

116 300 250 315 235 M 16 23136 CCK/W33 H 3136 2 FRB 10/300C 3136 K H 3136 L 2 FRB 10/300


124 320 270 335 255 M 20 23138 CCK/W33 H 3138 2 FRB 10/320


132 340 290 355 274 M 20 23140 CCK/W33 H 3140 2 FRB 10/340C 3140 K H 3140 2 FRB 10/340

200 130 340 290 360 274 M 20 23044 CCK/W33 OH 3044 H 4 FRB 10/340C 3044 K OH 3044 H 4 FRB 10/340

140 370 300 365 280 M 20 23144 CCK/W33 OH 3144 H 2 FRB 10/370C 3144 K OH 3144 HTL 2 FRB 10/370

3

G

H

LJ

2

N

N

J

1

1



36



two seals

mm mm kg –












Ca

H

H1

A

AA

daDa

1

2

s

A 3 A4


Page ............. 3 Page ............. 10

37



mm mm mm – –








180 500 360 445 345 M 30 23160 CCK/W33 OH 3160 H 2 FRB 10/500C 3160 K OH 3160 H 2 FRB 10/500


196 540 380 465 365 M 30 23164 CCK/W33 OH 3164 H 2 FRB 10/540C 3164 K OH 3164 H 2 FRB 10/540

3

G

H

LJ

2

N

N

J

1

1



38



two seals

mm mm kg –


340 810 220 SNL 3168 TS SNL 3168 TS 68 ETS 68SNL 3168 TNF SNL 3168 TNF 68 ETS 68SNL 3168 TURT – TSD 3168 U ETS 68 RSNL 3168 TURA – TSD 3168 U ETS 68 R

340 370 330 631 320 115 750 200 880 50 42 23 36 339 SNL 3072 TNF SNL 3072 TS 72 ETS 72SNL 3072 TNF SNL 3072 TNF 72 ETS 72SNL 3072 TURT – TSD 3072 U ETS 72 RSNL 3072 TURA – TSD 3072 U ETS 72 R


360 340 810 220 SNL 3076 TS SNL 3076 TS 76 ETS 76SNL 3076 TNF SNL 3076 TNF 76 ETS 76SNL 3076 TURT – TSD 3076 U ETS 76 RSNL 3076 TURA – TSD 3076 U ETS 76 R







Ca

H

H1

A

AA

daDa

1

2

s

A 3 A4

For missing dimensions and availability please consult SKF


Page ............. 3 Page ............. 10

39



mm mm mm – –

320 197 520 380 465 365 M 30 23068 CCK/W33 OH 3068 H 4 FRB 16/520C 3068 KM OH 3068 H 4 FRB 16/520

580 23168 CCK/W33 OH 3168 HC 3168 KM OH 3168 H

340 198 540 380 465 365 M 30 23072 CCK/W33 OH 3072 H 4 FRB 16/540

600 23172 CCK/W33 OH 3172 HC 3172 KM OH 3172 H

360 560 23076 CCK/W33 OH 3076 H

620 23176 CAK/W33 OH 3176 H

380 600 23080 CCK/W33 OH 3080 HC 3080 KM OH 3080 H

650 23180 CAK/W33 OH 3180 HC 3180 KM OH 3180 H

400 620 23084 CAK/W33 OH 3084 H

700 23184 CKJ/W33 OH 3184 HC 3184 KM OH 3184 H

3

G

H

LJ

2

N

N

J

1

1




40



two seals

mm mm kg –



430 420 1 030 260 SNL 3092 TS SNL 3092 TS 92 ETS 92SNL 3092 TNF SNL 3092 TNF 92 ETS 92SNL 3092 TURT – TSD 3092 U ETS 92 RSNL 3092 TURA – TSD 3092 U ETS 92 R


450 410 1 000 260 SNL 3096 TS SNL 3096 TS 96 ETS 96SNL 3096 TNF SNL 3096 TNF 96 ETS 96SNL 3096 TURT – TSD 3096 U ETS 96 RSNL 3096 TURA – TSD 3096 U ETS 96 R


470 420 1 030 260 SNL 30/500 TS SNL 30/500 TS 500 ETS 500SNL 30/500 TNF SNL 30/500 TNF 500 ETS 500SNL 30/500 TURT – TSD 30/500 U ETS 500 RSNL 30/500 TURA – TSD 30/500 U ETS 500 R


Ca

H

H1

A

AA

daDa

1

2

s

A 3 A4



Page ............. 3 Page ............. 10

41



mm mm mm – –

410 650 23088 CAK/W33 OH 3088 H

720 23188 CAK/W33 OH 3188 H

430 680 23092 CAK/W33 OH 3092 H

760 23192 CAK/W33 OH 3192 HC 3192 KM OH 3192 H

450 700 23096 CAK/W33 OH 3096 HC 3096 KM OH 3096 H

790 23196 CAK/W33 OH 3196 H

470 720 230/500 CAK/W33 OH 30/500 HC 30/500 KM OH 30/500 H

3

G

H

LJ

2

N

N

J

1

1



Page ............. 3 Page ............. 10 Large SNL plummer block housingsfor bearings with cylindrical boreda 170–300 mm

42



two seals

mm mm kg –

170 230 180 333 170 70 430 100 510 34 28 14 24 69,5 SNL 3134 GTS SNL 3134 G TS 40 ETS 40SNL 3134 GTNF SNL 3134 G TNF 40 ETS 40


240 190 353 180 75 450 110 530 34 28 15 24 77,5 SNL 3136 GTS SNL 3136 G TS 44 ETS 44SNL 3136 GTNF SNL 3136 G TNF 44 ETS 44


260 210 375 190 80 480 120 560 34 28 10 24 97,5 SNL 3138 GTS SNL 3138 G TS 44 ETS 44SNL 3138 GTNF SNL 3138 G TNF 44 ETS 44


280 230 411 210 85 510 130 610 42 35 10 30 123 SNL 3140 GTS SNL 3140 G TS 48 ETS 48SNL 3140 GTNF SNL 3140 G TNF 48 ETS 48

220 280 230 411 210 85 510 130 610 42 35 10 30 123 SNL 3044 GTS SNL 3044 G TS 52 ETS 52SNL 3044 GTNF SNL 3044 G TNF 52 ETS 52










Labyrinth seals Taconite sealsTS design TNF design

Ca

H

H1

A

AA

dadbDa

1

2

s

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Shaft Bearing Width across Eye bolts Appropriate bearings and associated componentsseating seals according to Spherical roller bearing Locating rings

DIN 580 CARB bearingda db Ca Da A2 A3

mm mm mm – –

170 180 108 280 240 300 M 16 23134 CC/W33 2 FRB 10/280

180 200 108 280 240 310 M 16 23036 CC/W33 2 FRB 17/28024036 CC/W33 2 FRB 4/280C 3036 2 FRB 17/280

116 300 250 315 M 16 23136 CC/W33 2 FRB 10/300C 3136 2 FRB 10/300

190 200 115 290 250 315 M 16 23038 CC/W33 4 FRB 10/29024038 CC/W33 2 FRB 7,5/290C 3038 4 FRB 10/290

124 320 270 335 M 20 23138 CC/W33 2 FRB 10/320

200 220 122 310 270 335 M20 23040 CC/W33 4 FRB 10/31024040 CC/W33 2 FRB 6,5/310C 3040 4 FRB 10/310

132 340 290 355 M 20 23140 CC/W33 2 FRB 10/340C 3140 2 FRB 10/340


140 370 300 365 M 20 23144 CC/W33 2 FRB 10/370C 3144 2 FRB 10/370


148 400 315 400 M 24 23148 CC/W33 2 FRB 10/400C 3148 2 FRB 10/400


164 440 330 415 M 24 23152 CC/W33 2 FRB 10/440C 3152 2 FRB 10/440


166 460 330 415 M 24 23156 CC/W33 2 FRB 10/460C 3156 2 FRB 10/460


180 500 360 445 M 30 23160 CC/W33 2 FRB 10/500C 3160 2 FRB 10/500

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two seals

mm mm kg –




340 810 220 SNL 3168 GTS SNL 3168 GSNL 3168 GTNF SNL 3168 G



380 340 810 220 SNL 3076 GTS SNL 3076 GSNL 3076 GTNF SNL 3076 G








460 420 1 030 260 SNL 3092 GTS SNL 3092 GSNL 3092 GTNF SNL 3092 G



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mm mm mm – –

320 340 181 480 360 445 M 30 23064 CC/W33 6 FRB 10/48024064 CC/W33 2 FRB 10,5/480C 3064 M 6 FRB 10/480

196 540 380 465 M 30 23164 CC/W33 2 FRB 10/540C 3164 M 2 FRB 10/540

340 360 197 520 380 465 M 30 23068 CC/W33 4 FRB 16/52024068 CC/W33 2 FRB 8,5/520C 3068 M 4 FRB 16/520

580 23168 CC/W33C 3168 M

360 380 198 540 380 465 M 30 23072 CC/W33 4 FRB 16/54024072 CC/W33 2 FRB 9/540

600 23172 CC/W33C 3172 M

380 560 23076 CC/W3324076 CC/W33

620 23176 CA/W33

400 600 23080 CC/W3324080 ECCJ/W33C 3080 M

650 23180 CA/W33C 3180 M

420 620 23084 CA/W3324084 ECA/W33

700 23184 C/W33C 3184 M

440 650 23088 CA/W3324088 ECA/W33

720 23188 CA/W33

460 680 23092 CA/W3324092 ECA/W33

760 23192 CA/W33C 3192 M

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two seals

mm mm kg –

480 410 1 000 260 SNL 3096 GTS SNL 3096 GSNL 3096 GTNF SNL 3096 G


500 420 1 030 260 SNL 30/500 GTS SNL 30/500 GSNL 30/500 GTNF SNL 30/500 G


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mm mm mm – –

480 700 23096 CA/W3324096 ECA/W33C 3096 M

790 23196 CA/W33

500 720 230/500 CA/W33240/500 ECA/W33C 30/500 M

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CARB bearingsThese bearings are a recent additionto the range of ball and roller bearingsoffered by SKF and are an SKF inven-tion. CARB bearings of series C 30and C 31 can be incorporated in largeSNL plummer block housings.

Although available in a caged aswell as a full complement version, it is normally recommended that cagedbearings are used in SNL housings.CARB bearings are available with atapered bore for mounting on an ad-apter sleeve or a withdrawal sleeve, as well as with a cylindrical bore.

Spherical roller bearings The spherical roller bearings whichcan be used in large SNL plummerblock housings are those of series230, 231 and 240. The bearings areavailable with tapered bore for mount-ing on adapter or withdrawal sleeves,or with cylindrical bore.

Other products for trouble-freeoperation

48

Robust, high-performance standard bearingsSKF produces the spherical rollerbearings and CARB bearings normallyincorporated in large SNL plummerblock housings in many sizes andseveral designs. Both bearing typesare self-aligning. The degree of mis-alignment which can be accommod-ated depends on the bearing seriesand also on the seals used in the SNLhousings.

The spherical roller bearings can beused for both locating and non-locatingbearing arrangements. At non-locatingpositions, the bearing outer ring is freeto move axially in its seating in thehousing bore. CARB bearings, on theother hand, accommodate axial dis-placements within the bearing and arealways non-locating. It is usual to combine a CARB bearing at the non-locating side with a spherical rollerbearing arranged as a locating bearingat the other side.

Adapter sleevesThese are slotted sleeves with a tapered outside diameter. The sizesused with bearings for SNL housingshave an external taper of 1:12 and aresupplied complete with lock nut andlocking washer. Their dimensions arein accordance with ISO 2982-1:1995.

When using adapter sleeves onsmooth shafts it is possible to locatethe bearing at any position on the shaftand no additional axial location isrequired.

Withdrawal sleevesThese are also slotted sleeves with atapered outside diameter. The sizesused with bearings for SNL housingshave an external taper of 1:12. Theirdimensions are in accordance withISO 2982-1:1995.

Bearings on withdrawal sleeves mustbe mounted against a fixed abutment,e.g. a shaft shoulder. The withdrawalsleeve must be secured in positionafter it has been pressed into the bearing bore by a lock nut or end plateon the shaft. The nuts are not suppliedwith the sleeves.

49

For easy mounting –adapter and withdrawalsleevesGenerally the bearings with a taperedbore incorporated in SNL plummerblock housings are mounted onsmooth or stepped shafts with the aidof an adapter sleeve or, on steppedshafts only, a withdrawal sleeve. Thesesleeves are produced by SKF in appro-priate sizes for the range of bearingswhich can be used in SNL housings.The adapter sleeves are the more popular as they are more versatile andare easier to mount.

More information about� spherical roller bearings

(➔ brochure 5100)� CARB bearings (➔ brochure 5102)� adapter and withdrawal sleeves

(➔ catalogue 3766)

Pop Release unitsThese units are plummer blocks withready-lubricated bearings for easyinstallation. They comprise

� a one-piece plummer block housingof grey cast iron,

� a spherical roller bearing of series222 with special inner ring,

� a special adapter sleeve, and� two seals of the “TriGard” type or

two labyrinth seals.

The units are available in a locatingand a non-locating version.

Lubricating greases for bearingsLubrication is a necessity for properbearing performance. Grease is norm-ally used for applications involvingSNL plummer blocks. SKF has putconsiderable effort into establishing arange of high-quality greases for balland roller bearing lubrication.

The SKF SYSTEM 24 automaticlubricator can also be used with SNLplummer block housings. An adaptercan be fitted to the standard drilled and tapped hole in the housing cap. It should be remembered that surplusgrease should be able to leave thehousing.

50

Other productsLock nutsSKF lock nuts, also referred to as shaftnuts, are available in several designsto axially locate bearings on shaftends. The most popular are those ofseries KM, KML and HM. These nutshave four or eight equally spaced slotsin the outside diameter and are lockedin position with locking washers orlocking clips engaging a groove in theshaft. The nut dimensions are in ac-cordance with ISO 2982-2:1995 as are the dimensions of the series MBand MBL locking washers.

Other lock nuts produced by SKFinclude those of series KMT, KMTA,KMK and KMFE, that do not require agroove in the shaft.

51

Other bearing housingsTo meet a wide variety of applicationdemands, SKF produces a compre-hensive range of bearing housings.The majority of these are of the splitplummer block type but the SKF rangealso includes

� one-piece plummer block housings,� flanged housings,� take-up housings, and� two-bearing housings.

Most of these housings are designedto take self-aligning bearings, and therange extends to shaft diameters up toand including 1 800 mm. Housings areavailable for oil lubrication as well as

grease lubrication and also for bear-ings with cylindrical bore or for taper-ed bore, mounted on adapter or with-drawal sleeves. Smooth or steppedshafts can be used.

Various different types of seal areused. Most housings are made of greycast iron but spheroidal graphite castiron or cast steel housings are includedin the range.

For further information, please con-tact SKF.

More information about� lock nuts (➔ brochure 4412 and

catalogue 3766)� greases (➔ catalogue MP3000)� Pop Release units (➔ brochure

5103)� housings (➔ catalogue 4005)

52

Taking the temperature Noise testing

Recording vibration values using an SKF Microlog data collection unit

The MARLIN™ machine reliabilityinspection system

Condition monitoringequipmentThe goals of condition monitoring areto maximise the time that the machineis functioning well and to minimise thenumber of breakdowns, thereby signi-ficantly reducing operating downtimeand maintenance cost.

To achieve this, it is recommendedthat the bearing and machine conditionbe monitored either periodically or con-tinuously. Condition monitoring enablesincipient bearing damage to be detect-ed and evaluated, so that bearingreplacement can be scheduled for atime when the machine is not in opera-tion, to avoid unplanned stoppages.Applied to all machinery (not just sens-itive or problematic machines), con-dition monitoring improves machineryoperation to an optimum level, oftenexceeding the original equipment specifications.

SKF provides a comprehensiverange of condition monitoring equip-ment to measure all important para-meters. These include

� temperature,� speed,� noise,� oil condition,� shaft alignment,� vibration and� bearing condition.

The range includes lightweight, hand-held devices for manual use as well ascomplex continuous monitoring sys-tems for fixed installations in connec-tion with preventive maintenance.

One example is the MachineReliability Inspection System MARLIN™which is at the leading edge of techno-logy and allows storage of up to 2 000measuring points. It can be used todiagnose machines and individualbearings and is backed by tailoredsoftware for the evaluation of the read-ings including enveloping vibrationacceleration curves.

54

The SKF Group– a worldwide corporation

SKF is an international industrial Groupoperating in some 130 countries and isworld leader in bearings.

The company was founded in 1907following the invention of the self-align-ing ball bearing by Sven Wingquist and,after only a few years, SKF began toexpand all over the world.

Today, SKF has some 40 000 em-ployees and around 80 manufacturingfacilities spread throughout the world.An international sales network includesa large number of sales companies andsome 7 000 distributors and retailers.Worldwide availability of SKF productsis supported by a comprehensive technical advisory service.

The key to success has been a con-sistent emphasis on maintaining thehighest quality of its products and services. Continuous invest-ment in research and

development has also played a vitalrole, resulting in many examples ofepoch-making innovations.

The business of the Group consistsof bearings, seals, special steel and acomprehensive range of other high-tech industrial components. The experi-ence gained in these various fieldsprovides SKF with the essential know-ledge and expertise required in orderto provide the customers with the mostadvanced engineering products andefficient service.

55

The SKF Group is the first major bearingmanufacturer to have been granted approvalaccording to ISO 14001, the internationalstandard for environmental managementsystems. The certificate is the most com-prehensive of its kind and covers more than60 SKF production units in 17 countries. The SKF Engineering & Research Centre

is situated just outside Utrecht in TheNetherlands. In an area of 17 000 squaremetres (185 000 sq.ft) some 150 scientists,engineers and support staff are engaged inthe further improvement of bearing perform-ance. They are developing technologiesaimed at achieving better materials, betterdesigns, better lubricants and better seals – together leading to an even better under-standing of the operation of a bearing in itsapplication. This is also where the SKF LifeTheory was evolved, enabling the design of bearings which are even more compact and offer even longer operational life.

SKF has developed the Channel concept infactories all over the world. This drasticallyreduces the lead time from raw material toend product as well as work in progressand finished goods in stock. The conceptenables faster and smoother informationflow, eliminates bottlenecks and bypassesunnecessary steps in production. TheChannel team members have the know-ledge and commitment needed to share theresponsibility for fulfilling objectives in areassuch as quality, delivery time, productionflow etc.

SKF manufactures ball bearings, roller bearings and plain bearings. The smallestare just a few millimetres (a fraction of aninch) in diameter, the largest several metres.SKF also manufactures bearing and oilseals which prevent dirt from entering and lubricant from leaking out. SKF’s subsidiaries CR and RFT S.p.A. are amongthe world’s largest producers of seals.

® SKF and CARB are registeredtrademarks of SKF.

© Copyright SKF 2001The contents of this publication are thecopyright of the publisher and may notbe reproduced (even extracts) unlesspermission is granted. Every care hasbeen taken to ensure the accuracy ofthe information contained in this pub-lication but no liability can be accepted for any loss or damage whether direct,indirect or consequential arising out ofthe use of the information containedherein.

Publication 5101 E/I · June 2001

Printed in Sweden on environmentallyfriendly, chlorine-free paper (MultiartSilk) by Hyltebruks Tryckeri AB. www.skf.com

snl 30 and snl31 plummer block housings solve … e i snl30...designs of split plummer block...

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