threads&threaded joints 2007-08

7/23/2019 Threads&Threaded Joints 2007-08

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Threads-

Terminology in threads-

External thread-


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Internal threads


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Different Types of Thread profiles:-

1. Square Threads.

2. V-threads.

3. ACME Threads

4. Buttress Threads.

5. Whit!rth threads

Thread Conventions


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Square Threads

V- threads


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ACME threads

Buttress threads


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hit!orth Threads


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STA"DA#D #E$#ESE"TAT%&" &' T(#EADS

Visible screw threads - "!r #isi$les%re threads& the %rests !' threads sh!uld $e de'ined $( a %!ntinu!us thi%)

line *t(+e A,& and the r!!ts !' threads $( a %!ntinu!us thin line *t(+e B,.

Hidden screw threads- "!r hidden s%re threads& the %rests and the

r!!ts sh!uld $e de'ined $( dashed lines.

Sections of threaded parts "!r threaded +arts sh!n in se%ti!n& hat%hin

sh!uld $e extended t! the line de'inin the %rest !' the thread.


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End view of screw threads - n an end #ie !' a #isi$le s%re thread& the thread

r!!ts sh!uld $e re+resented $( a +!rti!n !' a %ir%le& dran ith a %!ntinu!us thin

line *t(+e B,& !' lenth a++r!xi/atel( three-quarters !' the %ir%u/'eren%e.

The a$!#e %!n#enti!ns a++l( t! asse/$lies !' threaded +arts. 0!e#er&

externall( threaded +arts sh!uld ala(s $e sh!n %!#erin internall(threaded +arts and sh!uld n!t hidden $( the/


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METIC T0EA STAAS


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I"IE T0EA STAAS


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(e)agonal headed *olt

Square headed *olt

enerall( used hen the head is t! $e a%%!//!dated in re%ess. e%ess is als!

/ade u+ !' square sha+e t! +re#ent r!tati!n !' $!lt.

Square ne%) t! a#!id r!tati!n !'

B!lt hile tihtenin a nut.


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Cylindri+al or +heese headed *olt

sed hen-6S+a%e '!r a%%!//!datin $!lt head

is less.6se !' s+anner is t! $e a#!ided.

!tati!n !' $!lt is +re#ented $(

/eans !' a +in

T- headed *olt

67ri/aril( used in /a%hine t!!l ta$les.6"its in T sl!t +r!#ided !n the/.


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Counter sun, headed *olt

6sed in a++li%ati!n here head !'

$!lt /ust n!t +r!8e%t a$!#e the sur'a%e

!' %!nne%ted +ie%e.6It /a( +r!#ided ith the ne%) !' square

%r!ss-se%ti!n.

(oo, Bolt

6This $!lt +asses thr!uh a h!le !' !ne +ie%e

!nl(. !ther +ie%e is ri++ed $( the h!!) sha+ed

$!lt head.6This is used hen it is n!t +!ssi$le t! drill h!le

in the +ie%e ad8!inin $!lt head.


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Eye Bolt-

6B!lt has %ir%ular rin as its head.6sed as an a++lian%e t! li't hea#(

/a%hines.

Stud-

It %!nsists !' a %(lindri%al shan) threaded

at $!th sides.

The nut end is threaded '!r a lenth slihtl(

M!re than thi%)ness !' nut.

Metal end M is threaded t! lenth at least equal

T! dia/eter !' stud.


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asher

'itting of stud


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(e)agonal nut

Dra!ing a he)agonal nut

A++r!x Std. i/ensi!ns

T9: W91.5;3//:

91.4

!uh ule i/ensi!ns

T9: 91.5

istan%e a%r!ss dia!nall(

!++!site %!rners< 2


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"uts

T!//(Bar = 7in

s+anner


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.o+,ing arrangements for nuts

6ue t! #i$rati!ns& there is ala(s a tenden%( t! '!r nuts t! et sla%).6The nut A is 'irst s%reed !n $!lt as tihtl( as +!ssi$le.6The nut B is then s%reed !n the $!lt till it t!u%hes the t!+ !' nut A.

6The nut B is hel+ $( s+anner and nut A is turned $a%)ards thr!uh 'e derees.6The t! nuts are hen%e l!%)ed tihtl( due t! edin a%ti!n aainst ea%h

!ther and $!lt.6ut B %arries all the l!ad& hen%e it is /ade thi%)er than nut A. enerall( nut A

thi%)ness is )e+t >.? ti/es !' thi%)ness !' nut B


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M!lten

@ead =sul+hur

'oundation *olts


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'oundation *olts


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B!lt t(+e 7i%ture A++li%ati!n

Square headed Bearins !' sha't

C(lindri%al headedBi end !' %!nne%tin r!ds&

e%%entri%s& et%.

T-headed Ma%hine t!!l ta$les& $!iler/!untins su%h as st!+#al#e& 'eed %he%) #al#e et%.

C!unter-sun) headedWhere the $!lt head /ustn!t +r!8e%t a$!#e sur'a%e

E(e $!lt "!r li'tin hea#( /a%hines

Stud

C!nne%t %(linder %!#er t!enine %(linder

Situati!ns here there is n!

s+a%e '!r $!lt heads


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threads&threaded joints 2007-08

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