asme b1 30_m_1992

Copyright ASME International Provided by IHS under license with ASME

Not for ResaleNo reproduction or networking permitted without license from IHS

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0759b70 0525492 582 m

AN AMERI CAN NATIONAL STANDARD

Screw Threads - Standard Practice for

Calculating and Rounding Dimensions

ASME B I .30M-1992

The American Society of Mechanical Engineers

345 East 47th Street, New York, N.Y. 10017 -



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ASME B1.30M 92 m 0759670 0525493 419 m

Date of Issuance: September 15, 1992

This Standard will be revised when the Society approves the issuance of a new edition. There will be no addenda or written interpretations of the re- quirements of this Standard issued to this Edition.

ASME is the registered trademark of The American Society of Mechanical Engineers.

This code or standard was developed under procedures accredited as meeting the criteria for American National Standards. The Consensus Committee that approved the code or standard was balanced to assure that individuals from competent and concerned interests have had an opportunity to participate. The proposed code or standard was made available for public review and comment which provides an opportunity for additional public input from industry, academia, regulatory agencies, and the public-at-large.

ASME does not "approve," "rate," or "endorse" any item, construction, proprietary device, or activity.

ASME does not take any position with respect to the validity of any patent rights asserted in connection with any items mentioned in this document, and does not undertake to insure anyone utilizing a standard against liability for infringement of any applicable Letters Patent, nor assume any such liability. Users of a code or standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, is entirely their own responsibility.

Participation by federal agency representative(s) or person(s) affiliated with industry is not to be interpreted as government or industry endorsement of this code or standard.

ASME accepts responsibility for only those interpretations issued in accordance with governing ASME procedures and policies which preclude the issuance of interpretations by individual volunteers.

No part of this document may be reproduced in any form, in an electronic retrieval system or otherwise,

without the prior written permission of the publisher.

Copyright O 1992 by THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS

AI1 Rights Reserved Printed in U.S.A.



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ASME BL-30M 92 W O759670 O525494 355 W

FOREWORD

(This Foreword is not part of ASME B1.30M-1992.)

The American National Standards Committee B1 for standardization of screw threads was organized in 1920 as sectional committee B1 under the sponsorship of the American Engi- neering Standards Committee (later the American Standards Association, then the United States of America Standards Institute and as of October 6, 1969, the American National Standards Institute, Inc.), with the Society of Automotive Engineers and The American Society of Me- chanical Engineers as joint sponsors. As a result, a great deal of effort was expended through the years toward development of several screw thread standards.

Recognizing the need to standardize the method of rounding decimal values in the calculation of screw thread dimensions, the ASME Standards Committee B1 charged Subcommittee 30 with the responsibility for producing such a standard.

This Standard designated ASME B l . 30M was developed to serve as the basis for rounding of decimal values associated with the computation of screw thread dimensions.

The examples and formulas depicted within this Standard are for reference only and are presented only to clarify the rounding procedures described. When calculating the different thread characteristics for a particular thread form, refer to the appropriate ASME B 1 standard for the formulas and methodology of calculation for that thread.

Suggestions for improvement of this Standard will be welcome. They should be sent to Secretary, ASME B1 Main Committee, 345 East 47th Street, New York, NY 10017.

This Standard was approved as an American National Standard on June 29, 1992.

111 ...



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o

ASME Bl1.30M 92 m 0759670 0525495 291 m

ASME STANDARDS COMMITTEE B I Standardization and Unification of Screw Threads

(The following is the roster of the Committee at the time of approval of this Standard.)

OFFICERS

E. Schwartz, Chairman K. E. McCullough, Vice Chairman

C . J. Gomez, Secretary

COMMITTEE PERSONNEL

J. R. Anderson R. J. Browning R. M. Byrne D. P. Cadieux F. G. Calderone F. H. Cantrell R. S. Chamerda R. Dodge P. H. Drake A. E. Ellis H. W. Ellison C. G. Erickson W. C. Farrell, Jr. R. E. Ferry, Jr. G. A. Flannery D. S. George J. Greenslade J. O. Heinze R. R. Hyman C. W. Jatho S. P. Johnson S. I. Kanter J. Krippes

R. W. Lamport R. S. LaNier J. B. Levy J. C. McMurray D. Miskinis W. R. Newman A. Painter G. A. Russ R. J. Sabatos D. M. Satava M. M. Schuster R. H. Searr R. E. Seppey A. D. Shepherd, Jr. V. B. Shook A. G. Strang J. F. Sullivan R. L. Tennis A. F. Thibodeau A. M. Wilkerson C. J. Wilson

F. H. Cantrell, Chairman R. J. Browning D. P. Cadieux R. S . Chamerda P. H. Drake R. E. Ferry, Jr.

V

T. L. Gaslin D. S. George D. M. Satava E. Schwartz R. H. Searr C. J. Wilson.



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A S I E BL.30M 72 0759b70 05251t7b L28

CONTENTS

... Foreword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111

Standards Committee Roster v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.1 Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.2 Metric Application 1

2 Rounding of Decimal Values 1 2.1 RoundingPolicy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

3 Calculations From Formulas 2 3.1 General Rules 2 3.2 Examples 3

3.2.1 Inch Screw Threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3.2.2 Metric Screw Threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.2.3 Metric External Screw Threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.2.4 Metric Internal Screw Threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Thread Form Constants 1 1

Appendix A Thread Form Tables 13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Tables 1 Thread Data. UN. UNR. and UNJ Profiles (Inch Screw Threads) . . . . . . . . . . . . . . . . . . . . . . . . 14 2 Thread Data. UN. UNR. and UNJ Profiles (Inch Screw Threads). ....................... 16 3 Thread Data. M and MJ Profiles (Metric Screw Threads) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

vii



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ASME BL.30M 92 m O759670 0525497 Ob4 m

ASME B1.30M-1992

SCREW THREADS - STANDARD PRACTICE FOR CALCULATING AND ROUNDING DIMENSIONS

1 GENERAL

1.1 Purpose

The purpose of this Standard is to establish uniform practices for calculating and rounding the numeric values used for inch and metric screw thread design data dimensions. No attempt is made to establish a policy of rounding actual thread characteristics measured by the man- ufacturer or user of thread gages. Covered is the Standard Rounding Policy regarding the last figure or decimal place to be retained by a numeric value and the number of decimal places to be retained by values used in intermediate calculations of thread dimensions. Some values listed in the Appendix may differ by as much as 0.O001 in. or 0.001 mm from values shown in previous issues of ASME B1 thread standards and are to take precedence in all future ASME B1 Standards.

1.2 Metric Application

Allowances (fundamental deviations) and tolerances for metric M and MJ screw threads are based upon formulas which appear in applicable standards. Values of allowances for standard tolerance positions and values of tolerances for standard tolerance grades are tabulated in these standards for a selection of pitches. Rounding rules specified below have not been applied to these values but have followed practices of the International Organization for Standardization (ISO). For pitches which are not included in the tables, standard formulas and the rounding rules specified herein are applicable.

2 ROUNDING OF DECIMAL VALUES

The following rounding practice represents the method to be used in all future ASME B1 thread standards.

NOTE: It is recognized that this Standard is not in agreement with other published documents, e.g., ASME SI-9, Guide for Metrication of Codes and Standards SI (Metric) Units, and ASTM E 380, Standard for Metric Practice. The rounding practices used in the forenamed documents are designed to produce even distribution of numerical values. The purpose of this document is to define the most practical and common used method of rounding numerical thread form values. Considering today’s technology, application of this method is far more practical in the rounding of thread form values.

2.1 Rounding Policy

2.1 .I When the figure next beyond the last figure or place retained is less than 5 , the figure in the last place retained is kept unchanged.

EXAMPLE

1 .O12342 1.01234 1 .O12342 1 .O123 1.012342 1 .o12

1



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ASME B l . 3 0 1 72 0757b70 0525498 T T 0 m

SCREW THREADS - STANDARD PRACTICE FOR ASME B1.30M-1992 CALCULATING AND ROUNDING DIMENSIONS

2.1.2 When the figure next beyond the last figure or place retained is greater than 5, the figure in the last place retained is increased by l .

EXAMPLE

1.56789 1 S679 1.56789 1.568 1.56789 1.57

2.1.3 When the figure next beyond the last figure or place retained is 5 , and: (a) there are no figures, or only zeros, beyond this 5, the last figure should be increased

by 1

EXAMPLE

1.01235 1.0124 1 .O123500 1 .O124 1 .O12345 1.01235 l . O 1234500 1.01235

(b) if the 5 next beyond the figure in the last place to be retained is followed by any figures other than zero, the figure in the last place retained should be increased by 1

EXAMPLE

1.0123501 1 .O124 1.0123599 1.0124 1.01234501 1 .O1235 1 .O1234599 1 .O1235

2.1.4 The final rounded value is obtained from the most precise value available and not from a series of successive roundings. For example, 0.5499 should be rounded to 0.550, 0.55 and 0.5 (not 0.6), since the most precise value available is less than 0.55. Similarly, 0.5501 should be rounded as 0.550, 0.55 and 0.6, since the most precise value available is more than 0.55. In the case of 0.5500 rounding should be 0.550, 0.55 and 0.6, since the most precise value available is 0.5500.

3 CALCULATIONS FROM FORMULAS

3. I General Rules

3.1 .I Values used in intermediate calculations are rounded to two places beyond the number of decimal places retained for the final value.

3.1.2 Rounding to the final value is the last step in a calculation.

3.1.3 For inch screw thread dimensions, four decimal places are required for the final values of pitch diameter, major diameter, and minor diameter with the exception of Class 1B and 2B internal thread minor diameters for thread sizes O. 138 and larger, see below. The final values for the allowance and tolerances applied to thread elements are expressed to four decimal places.

(a) Minor Diameter Exceptions for Internal í%reads: ( I ) Minimum Minor Diameter, all classes are calculated and then rounded off to the

2



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ASME BLm30fl 92 m 0759b70 0525499 937 W

SCREW THREADS - STANDARD PRACTICE FOR CALCULATING AND ROUNDING DIMENSIONS ASME B1.30M-1992

nearest 0.001 in. and expressed in three decimal places for sizes 0.138 in. and larger. For Class 3B, a zero is added to yield four decimal places.

(2) Maximum Minor Diameter, all classes are calculated before rounding, then rounded for Classes 1B and 2B to the nearest 0.001 in. for sizes O. 138 in. and larger. Class 3B values are rounded to four decimal places.

3.1.4 Metric screw threads are dimensioned in millimeters. The final values of pitch diameter, major diameter, minor diameter, allowance and thread element tolerances are expressed to three decimal places.

3.2 Examples

The formulas in the examples are based on those listed in ASME B l . 1, Unified Inch Screw Threads, for para. 3.2.1, and ANSUASME B1.13M, Metric Screw Threads - M Profile, for para. 3.2.2. The constant values may differ in the number of decimal places shown to conform to this Standard's policy of rounding numeric values and number of decimal places to be retained.

3.2.1 Inch Screw Threads (all dimensions expressed in inches)

Thread Size = 0.5000-28 UNEF-2ARB For calculations below; P = l /n = 1/28 = 0.03571429

(u) Maximum major diameter = Basic major diameter - allowance

d rnax = d bsc - l e s \

d bsc = 0.5000

es = 0.300 Td, (2A)

= 0.300 (0.003668)

= 0.001100

= 0.0011

This is the final value of the basic major diameter which is expressed in four decimal places.

[Class 2A Pitch Diameter Tolerance see para. 3.2.l(d)]

The six place value for Class 2A Pitch Diameter tolerance is used in this calculation.

This figure is rounded to four decimal places to obtain the final value of es.

d max = 0.5000 - 0.001 1 = 0.4989

(b) d min (Minimum External Thread Major Diameter)

= d max - Td (Major diameter tolerance)

Td = 0.060

= 0.060 7(0.03571429)*

3



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ASME BI .30M-1992

= 0.060 X 0.108450

= 0.006507

= 0.0065

d min = 0.4989 - 0.0065 = 0.4924

(c) d2 max (Maximum Pitch Diameter)


This figure is rounded to obtain the final value of Td

= d max - 0.64951905P

= 0.4989 - 0.64951905 (0.03571429)

= 0.475703 This figure is rounded to obtain the final value of d2 max

= 0.4757

( d ) d2 min (Minimum Pitch Diameter)

= d2 max - Td, (External Pitch Diameter Tolerance)

Td2 = 0.0015 G + 0.0015 JLE (Length of Engagement) + 0.015

= 0.0015 'm + 0.0015 h Ï % + 0.015 ?(0.03571429)2

= 0.0015 'm + 0.0015 + 0.015 'Jon276 = 0.001191 + 0.000850 + 0.001627

= 0.003668

= 0.0037

d2 min = 0.4757 - 0.0037 = 0.4720

(e) d3 max (Maximum Minor Diameter) UNR

= d max - 1.19078493P

= 0.4989 - 1.19078493 (0.03571429)

= 0.4989 - 0.042528

= 0.456372

= 0.4564

4

This figure is rounded to obtain the final value of Td,

This figure is rounded to obtain the final value of d3 max.



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ASME B3.30M 92 m O759670 0525503 335 m


( f ) D, min (Minimum Internal Minor Diameter)

= D bsc (Basic Major Diameter) - 1.08253175P

= 0.5000 - 1.08253175 (0.03571429)

= 0.5000 - 0.038662

= 0.461338

= 0.461

(8) D, max (Maximum Internal Minor Diameter)

= D I min + TD, (Internal Minor Diameter)

í V I = 0.25P - 0.4P2

= 0.25 (0.03571429) - 0.40 (0.00127551)

= 0.008929 - 0.000511

= 0.008418

D, max = 0.461338 + 0.008418 = 0.469756

D, max = 0.470

ASME B1.30M-1992

For the Class 2B thread used in our example this figure is rounded to three decimal places to obtain the final value ofD, min

This figure is rounded to three decimal places to obtain the final value of T D ,

3.2.2 Metric Screw Threads (all dimensions expressed in millimeters)

Thread Size = M12 X 1.75 - 4g6g

(u) Maximum major diameter = Basic major diameter - allowance

dmax = dbsc - ( e s (

d bsc = 12.000

es = 0.034 (tabulated value)

d max = 12.000 - 0.034 = 11.966

= 11.966 when rounded

(6) Minimum major diameter = Maximum major diameter - tolerance

d min = d max - Td

5



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I ASME Bl1.30M 92 m 0759b70 O525502 251 D


d max = 11.966 [see para. 3.2.2(a)]

Td = 0.265 (tabulated value)

d min = 11.966 - 0.265 = 11.701

= 11.701 when rounded.

(c) Maximum pitch diameter = Basic major diameter - allowance - 0.64951905P

dz max = d max - 0.6495 1905P

d max = 11.966 [see para. 3.2.2(a)]

dz max = 11.966 - 1.136658 = 10.829342


(d) Minimum pitch diameter = Maximum pitch diameter - tolerance

d2 min = d2 max - Td,

dz max = 10.829 [see para. 3.2.2(c)J

Td2 = 0.095 (tabulated value)

d2 min = 10.829 - 0.095 = 10.734


(e) Maximum minor diameter (flat form) = Maximum pitch diameter - 0.43301270P

dl max = d2 max - 0.43301270P

d2 max = 10.829 [see para. 3.2.2(c)]

d, max = 10.829 - 0.757773 = 10.071227


(f) Minimum minor diameter (round form) = Minimum pitch diameter - 0.61602540P

d3 min = d2 min - 0.61602540P

d2 min = 10.734 [see para. 3.2.2(d)]

d3 min = 10.734 - 1.07804 = 9.65596


6



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3.2.3 Metric External Screw Thread, MI3 x 0.9 - 4g6g (u) Maximum major diameter = Basic major diameter - allowance

d max = d bsc - I es 1 ; 1 es 1 is absolute value.

ASME EI .30M-1992

d bsc = 13.000

1 esgl = 0.015 + 0.011P

= 0.015 + 0.011 (0.9)

= 0.0249

This is the final value of the basic major diameter and is therefore expressed with 3 decimal places.

es for tolerance position “g” is not tabulated for P = 0.9 so it must be calculated.

This figure is rounded to 3 decimal places to obtain the final absolute value of allowance for tolerance position “g”.

= 0.025 When rounded

d max = 13.000 - 0.025 = 12.975

(b) Minimum major diameter = Maximum major diameter - tolerance

d min = d max - tolerance

d max = 12.975 [see para. 3.2.3(a)]

Td(6) = 0.18 3@ - - 0.00315 &

0.00315 = O. 18 (0:9)2/3 - ~

(0.9)”’

0.00315 0.94868

= 0.18 (0.93217) - ____

= 0.16447

= O. 164 when rounded

d min = 12.975 - 0.164 = 12.811

Td for tolerance grade 6 is not tabulated for P = 0.9, it must be calculated

This figure is rounded to 3 decimal places to obtain final value of major diameter tolerance for tolerance grade 6.



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ASME BL-30M 92 m 0759670 0525504 O24 m

SCREW THREADS - STANDARD PRACTICE FOR ASME B1.30M-1992 CALCULATING AND ROUNDING DIMENSIONS

(c) Maximum pitch diameter = (Basic major diameter - allowance) - 0.64951905P

d2 max = d max - 0.64951905P

d max = 12.975 [see para. 3.2.3(a)]

dz max = 12.975 - 0.64951905 (0.9)

= 12.39043 This figure is rounded to obtain the final value of d2 max.


( d ) Minimum pitch diameter = Maximum pitch diameter - tolerance

dz min = d2 max - Td2

dz max = 12.390 [see para. 3.2.3(c)]

Td2 (4) = 0.63 Td2 (6) Td2 for tolerance grade 4 (or 6) is not tabulated for P = 0.9 so it must be calculated.

= 0.63 [0.09 P0.4do.']

= 0.63 E0.09 (0.9)o.4(13)o.']

= 0.63 10.09 (0.95873)( 1.29239)]

= 0.07025 This figure is rounded to 3 decimal places to obtain the final value of pitch diameter tolerance for tolerance grade 4.


d2 min = 12.390 - 0.070 = 12.320

(e) Maximum minor diameter (flat form) = Maximum pitch diameter - 0.43301270P

dl max = d2 max - 0.43301270P

d2 max = 12.390 [see para. 3.2.3(c)]

dl max = 12.390 - 0.43301270 (0.9)

= 12.390 - 0.38971

= 12.00029 This figure is rounded to 3 decimal places to obtain the final value of max minor diameter


8



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ASME BL.30M 92 m 0759670 0525505 Tb0 I


(f) For reference: Minimum minor diameter (round form) = Minimum pitch diameter - 0.61602540P

d3 min = d2 min - 0.61602540P

d, min = 12.320 [see para. 3.2.3(d)]

d3 min = 12.320 - 0.61602540 (0.9)

= 12.320 - 0.55442

= 11.76558 This figure is rounded to obtain the final value of minimum minor diameter

= l1.766 when rounded

3.2.4 Metric Internal Screw Thread, M13 x 0.9 - 6H

(u) Minimum major diameter = Basic major diameter + allowance

D min = D bsc + EI

D bsc = d bsc = 13.000 [see para. 3.2.3(a)]

EI, = O

D min = 13.000

(b) Minimum pitch diameter = Basic major diameter - 0.64951905P + allowance

D2 min = D bsc - 0.64951905P + EI

D bsc = 13.000 [see para. 3.2.4(a)]

EI, = O

D2 min = 13.000 - 0.64951905 (0.9) + O

= 13.000 - 0.58457

= 12.41543


This figure is rounded to obtain the final value of minimum pitch diameter.

(c) Maximum pitch diameter = Minimum pitch diameter + tolerance

D2 max = D2 min + T D 2

D2 min = 12.415 [see para. 3.2.4(b)]

9



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ASME B1.30M-1992

T D 2 (6) = 1.32 TG$ (6)

ASME BL-30M 92 m 0759b70 0525506 7T7 m


í ' D 2 (or TD,) for tolerance grade 6 is not tabulated for P = 0.9 so it must be calculated

= 1.32 [0.09 P0.4do.1]

= 1.32 [0.09 (0.9)0.4(13)0.']

= 1.32 [0.09 (0.95873)(1.29239)]

= 0.14720


D, max = 12.415 + 0.147 = 12.562

This figure is rounded to 3 decimal places to obtain the final value of pitch diameter tolerance for tolerance grade 6.

(d ) Minimum minor diameter = Minimum major diameter - 1.08253175P

D , min = D min - 1.08253175P

D min = 13.000 [see para. 3.2.4(a)]

D , min = 13.000 - 1.08253175 (0.9)

= 13.000 - 0.97428

This figure is rounded to 3 decimal places to obtain the final value of minimum pitch diameter.


(e) Maximum minor diameter = Minimum minor diameter + tolerance

D , max = D, min + tolerance

D, min = 12.026 [see para. 3.2.4(d)J

P = 0.9 is not tabulated nor is there any IS0 formula applicable to this pitch. Therefore, a tolerance midway between the tabulated values for P = 0.8 and P = 1.0 has been selected. This value is T D , (6) = 0.218

D , max = 12.026 + 0.218 = 12.244

(f) For reference: Maximum major diameter = Maximum pitch diameter + 0.79385662P

10



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ASME BL-30M 92 m 0759b70 0525507 833 m


D max = D2 max + 0.79385662P

D2 max = 12.562 [see para. 3.2.4(c)]

D max = 12.562 + 0.79385662 (0.9)

= 12.562 + 0.71447

= 13.27647

ASME B1.3OM-1992

This figure is rounded to 3 decimal places to obtain the final value of maximum major diameter


4 THREAD FORM CONSTANTS’

Thread Form Data Tables. The number of decimal places and the manner in which they are listed should be consistent. Thread form constants printed in older thread standards are based on a function of thread height (H) or pitch (P) . The equivalent of the corresponding function is also listed. There are some constants that would require these values to 8 decimal places before they would round to equivalent values. For standardization the tabulated listing of thread values based on a function of pitch has been established, with thread height used as a reference only. All thread calculations are to be perforded using a function of pitch ( P ) , rounded to 8 decimal places, not a function of thread height (m. Thread height is to be used for reference only.

r

I

l

Constant

0.0481 1 2 5 2 ~

0 .08660254~

0.1 oa2531 ap 0 . 1 2 9 9 0 3 a 1 ~

0.05412659P

0.09622504P

0.14433757P 0.1 6237976P 0.21650635P

0.2886751 3~

0 .360a4392~ 0 . 3 9 6 9 2 8 3 1 ~

0.32475953P

0.43301 270P 0.48713929P 0.541 26588P 0.57735027P O. 59539247P

0.61 343466P 0.61602540P 0.64951 905P 0 .7216a783~ 0 . 7 9 3 a 5 6 6 2 ~ 0.86602540P 1.082531 75P 1 .1 9Q78493P 1 . 2 2 6 a 6 9 3 2 ~

I l Reference Values

Hl1 8 Hl1 6 HI1 O Hl9 Hl8

3H120 Hl 6

3Hl16 Hl4

H13 3 Hl8 5Hl12

1 1 Hl24 Hl 2

9Hl16 5Hl8 2 Hl3

l l H l 1 6

17Hl24 . . .

3 Hl4 5H/16

l l H / 1 2 H

5 Hl4 1 1 Hl% 17Hl12

11

0.0556H 0.0625H O. 1 OOOH 0.1111H O. 1250H O. 1 500H O. 1667H o. 1 8 7 5 ~ 0.2500H

0.3333H 0.3750H 0.41 67H 0 . 4 5 8 3 ~ 0.5000H 0.5625H 0.6250H 0.6667H 0 . 6 8 7 5 ~

0 . 7 0 8 3 ~ 0.71 13H 0.7500H 0.8333H 0.9167H 1.0000H 1.2500H 1.3750H 1.41 67H



--``-`-`,,`,,`,`,,`---

ASME B1.30M 92 0759b70 0525508 77T m

APPENDIX A THREAD FORM TABLES

(This Appendix is not part of ASME B1.30M-1992 and is included for information only.)

Tables 1 through 3 have many of the common values listed for 60 deg. in. and metric threads. Tables 1 and 3 were calculated using pitch (P) as a function of thread height (H) . Table 2 values are based on pitch ( P ) alone.

13



--``-`-`,,`,,`,`,,`---

TABL

E 1

THR

EAD

D

ATA,

U

N,

UN

R,

AND

U

NJ

PRO

FILE

S (IN

CH

SC

REW

TH

REA

DS)

Refer

ence

On

ly )

HI’16

TPI

Pitch

, P

0.05

4126

59f

1 2

3

IO

0.01

2500

00

0.00

0677

‘2

0.01

3888

89

0.00

0752

i4

0.01

5625

00

0.00

0846

i6

0.01

7857

14

0.00

0967

.8

0.02

0833

33

0.00

1128

.4

0.02

2727

27

0.00

1230

.d

0.02

5000

00

0.00

1353

i6

0.02

7777

78

0.00

1504

12

0.

0312

5000

0.

0016

91

8 0.

0357

1429

0.

0019

33

:7 0.

0370

3704

0.

0020

05

4 0.

0416

6667

0.

0022

55

.O

0.05

0000

00

0.00

2708

8

0.05

5555

56

0.00

3007

6

O.Of

j2500

00

0.00

3383

4

0.07

1428

57

0.00

3866

3

0.07

6923

08

0.00

4164

2

0.08

3333

33

0.00

4511

1.5

0.

0869

5652

0.

0047

07

1 0.

0909

0909

0.

0049

21

0 0.

1000

0000

0.

0054

13

9 0.

1111

1111

0.

0060

14

8 0.

1250

0000

0.

0067

66

7 0.

1428

5714

0.

0077

32

6 0.

1666

6867

0.

0090

21

5 0.

2000

0000

0.

0108

25

4.5

0.22

2222

22

0.01

2028

4

0.25

0000

00

0.01

3532

Hi10

Hi

8 3H

i20

I.086

6025

41

L108

2531

8r

I.129

9038

11

4 5

6

0.00

1083

0.

0013

53

0.00

1624

0.

0012

03

0.00

1504

0.

0018

04

0.00

1353

0.

0016

91

0.00

2030

0.

0015

46

0.00

1933

0.

0023

20

0.00

1804

0.

0022

55

0.00

2706

0.

0019

68

0.00

2460

0.

0029

52

0.00

2165

0.

0027

06

0.00

3248

0.

0024

06

0.00

3007

0.

0036

08

0.00

2706

0.

0033

83

0.00

4059

0.

0030

93

0.00

3866

0.

0046

39

0.00

3208

0.

0040

09

0.00

4811

0.

0036

08

0.00

45

11

0.00

5413

0.

0043

30

0.00

5413

0.

0064

95

0.00

48

11

0.00

6014

0.

0072

17

0.00

5413

0.

0067

66

0.00

8119

0.

0061

86

0.00

7732

0.

0092

79

0.00

6662

0.

0083

27

0.00

9993

0.

0072

17

0.00

9021

0.

0108

25

0.00

7531

0.

0094

13

0.01

1296

0.

0078

73

0.00

9841

0.

0118

09

0.00

8660

0.

0108

25

0.01

2990

0.

0096

23

0.01

2028

0.

0144

34

0.01

0825

0.

0135

32

0.01

6238

0.

0123

72

0.01

5465

0.

0185

58

0.01

4434

0.

0180

42

0.02

1651

0.

0173

21

0.02

1651

0.

0259

81

0.01

9245

0.

0240

56

0.02

8868

0.

0216

51

0.02

7063

0.

0324

76

HI6 7

0.00

1804

0.

0020

05

0.00

2255

0.

0025

77

0.00

3007

0.

0032

80

0.00

3608

0.

0040

09

0.00

45

11

0.00

5155

0.

0053

46

0.00

6014

0.

0072

17

0.00

8019

0.

0090

2 1

0.01

0310

0.

0111

03

0.01

2028

0.

0125

51

0.01

3122

0.

0144

34

0.01

6038

0.

0180

42

0.02

0620

0.

0240

56

0.02

8868

0.

0320

75

0.03

6084

PC

3Hll6

I. 16

2379

761

8

0.00

2030

0.

0022

55

0.00

2537

0.

0029

00

0.00

3383

0.

0036

90

0.00

4059

0.

0045

11

0.00

5074

0.

0057

99

0.00

6014

0.

0067

66

0.00

8119

0.

0090

21

0.01

0149

0.

0115

99

0.01

2491

0.

0135

32

0.01

4120

0.

0147

62

0.01

6238

0.

0180

42

0.02

0297

0.

0231

97

0.02

7063

0.

0324

76

0.03

6084

0.

0405

95

HI4

b.21

6506

351

9 .

0.00

2706

0.

0030

07

0.00

3383

0.

0038

66

0.00

4511

0.

0049

21

0.00

5413

0.

0060

14

0.00

6766

0.

0077

32

0.00

8019

0.

0090

21

0.01

0825

0.

0120

28

0.01

3532

0.

0154

65

0.01

6654

0.

0180

42

0.01

8827

0.

0196

82

0.02

1651

0.

0240

56

0.02

7063

0.

0309

29

0.03

6084

0.

0433

01

0.04

8113

0.

0541

27

PC

HI3

I.288

6751

31

10

0.00

3608

0.

0040

09

0.00

4511

0.

0051

55

0.00

6014

0.

0065

61

0.00

7217

0.

0080

19

0.00

9021

0.

0103

10

0.01

0692

0.

0120

28

0.01

4434

0.

0160

38

0.01

8042

0.

0206

20

0.02

2206

0.

0240

56

0.02

5102

0.

0262

43

0.02

8868

0.

0320

75

0.03

6084

0.

0412

39

0.04

8 11

3 0.

0577

35

0.06

4150

0.

0721

69

3Hi8

1.32

4759

531

11

0.00

4059

0.

0045

11

0.00

5074

0.

0057

99

0.00

6766

0.

0073

81

0.00

8119

0.

0090

21

0.01

0149

0.

0115

99

0.01

2028

0.

0135

32

0.01

6238

0.

0180

42

0.02

0297

0.

0231

97

0.02

4982

0.

0270

63

0.02

8240

0.

0295

24

0.03

2476

0.

0360

84

0.04

0595

0.

0463

94

0.05

4127

0.

0649

52

0.07

2169

’ 0.

0811

90

HI2

I.433

01

2701

12

0.00

5413

0.

0060

14

0.00

6766

0.

0077

32

0.00

902

1 0.

0098

41

0.01

0825

0.

0120

28

0.01

3532

0.

0154

65

0.01

6038

0.

0180

42

0.02

1651

0.

0240

56

0.02

7063

0.

0309

29

0.03

3309

0.

0360

84

0.03

7653

0.

0393

65

0.04

3301

0.

0481

13

0.

0541

27

0.06

1859

0.

0721

69

0.08

6603

0.

0962

25

0.10

8253

(Con

tinue

d)

Cop

yrig

ht A

SM

E In

tern

atio

nal

Pro

vide

d by

IHS

und

er li

cens

e w

ith A

SM

EN

ot fo

r R

esal

eN

o re

prod

uctio

n or

net

wor

king

per

mitt

ed w

ithou

t lic

ense

from

IHS

--``-`-`,,`,,`,`,,`---

I- r

o r-

m r

15



--``-`-`,,`,,`,`,,`---

~ m m w m m ~ m m r b b o a o m ~ m a - o - o a b o ~ o m m a m m ~ o ~ ~ ~ o m o m ~ ~ m r n ~ m o - o m w o ~ o

- - - - ~ ~ ~ ~ n m m b m m w ~ ~ m m m ~ ~ - - - ~ ~ ~ ~ m m ~ o ~ m ~ - m ~ - o m ~ - a m w o o - ~ ~ w o ~ o 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

J

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

16



--``-`-`,,`,,`,`,,`---

ASME B1-30M 92 O759670 0525532 3TO W

u!

n

p / a

c I

II

Ir

m

(u

o o o o ö ö d d d ö ö o ~ d d d d d d d d d d ò o o o o o o o o o o o o c

17



--``-`-`,,`,,`,`,,`---

Ref

) 9H

i16

5Hl8

2Hl3

11H1

16

3Hl4

llH11

2 H

5H14

llH

l8

Pitch

3.

4871

3929

P 3.

5412

6566

P 0.

5773

5027

P 0.

5953

9247

P ( 1

.6160

254O

P ’

( 1.6

4951

905P

D.

7938

5662

P 1.8

6602

54OP

I .

0825

3175

P 1.

1907

8493

P

1 12

13

14

15

16

17

18

19

20

21

0.20

0.09

7428

0.

1082

53

0.11

5470

0.

1190

78

0.12

3205

0.

1299

04

0.15

8771

0.

1732

05

0.25

0.12

1785

0.

1353

16

0.14

4338

0.

1488

48

0.15

4006

0.

1623

80

0.19

8464

0.

2165

06

0.30

0.14

6142

0.

1623

80

0.17

3205

0.

1786

18

0.18

4808

0.

1948

56

0.23

8157

0.

2598

08

0.35

0.17

0499

0.

i a94

43

0.20

2073

0.

2083

87

0.21

5609

0.

2273

32

0.27

7850

0.

3031

09

0.40

0.19

4856

0.

2165

06

0.23

0940

0.

2381

57

0.24

6410

0.

2598

08

0.31

7543

0.

3464

10

0.45

0.21

9213

0.

2435

70

0.25

9808

0.

2679

27

0.27

7211

0.

2922

84

0.35

7235

0.

3897

11

0.50

0.24

3570

0.

2706

33

0.28

8675

0.

2976

96

0.30

8013

0.

3247

60

0.39

6928

0.

4330

13

0.60

0.29

2284

0.

3247

60

0.34

6410

0.

3572

35

0.36

9615

0.

3897

1 i

0.47

6314

0.

5196

15

0.70

0.34

0998

0.

3788

86

0.40

4145

0.

4167

75

0.43

1218

0.

4546

63

0.55

5700

0.

6062

18

0.75

0.36

5354

0.

4059

49

0.43

3013

0.

4465

44

0.46

2019

0.

4871

39

0.59

5392

0.

6495

19

0.80

0.38

971

I 0.

4330

13

0.46

1880

0.

4763

14

0.49

2820

0.

5196

15

0.63

5085

0.

6928

20

1.00

0.48

7139

0.

5412

66

0.57

7350

0.

5953

92

0.61

6025

0.

6495

19

0.79

3857

0.

8660

25

1.25

0.60

8924

0.

6765

82

0.72

1688

0.

7442

41

0.77

0032

0.

8118

99

0.99

2321

1.

0825

32

1.50

0.73

0709

0.

8118

99

0.86

6025

0.

8930

89

0.92

4038

0.

9742

79

1.19

0785

1.

2990

38

1.75

0.85

2494

0.

9472

15

1.01

0363

1.

0419

37

1.07

8044

1.

1366

58

1.38

9249

1.

5155

44

2.00

0.97

4279

1.

0825

32

1.15

4701

1.

1907

85

1.23

2051

1.

2990

38

1.58

7713

1.

7320

51

2.50

1.21

7848

1.

3531

65

1.44

3376

1.

4884

81

1.54

0064

1.

6237

98

1.98

4642

2.

1650

64

3.00

1.46

1418

1.

6237

98

1.73

2051

1.

7861

77

1.84

8076

1.

9485

57

2.38

1570

2.

5980

76

3.50

I, 70

4988

1.

8944

31

2.02

0726

2.

0838

74

2.15

6089

2.

2733

17

2.77

8498

3.

0310

89

4.00

i .94

8557

2.

1650

64

2.30

9401

2.

3815

70

2.46

4102

2.

5980

76

3.17

5426

3.

4641

02

4.50

2.19

2127

2.

4356

96

2.59

8076

2.

6792

66

2.77

2114

2.

9228

36

3.57

2355

3.

8971

14

5.00

2.43

5696

2.

7063

29

2.88

6751

2.

9769

62

3.08

0127

3.

2475

95

3.96

9283

4.

3301

27

5.50

2.67

9266

2.

9769

62

3.17

5426

3.

2746

59

3.38

8140

3.

5723

55

4.36

621

1 4.

7631

40

6.00

2.92

2836

3.

2475

95

3.46

4102

3.

5723

55

3.69

6152

3.

8971

14

4.76

3140

5.

1961

52

8.00

3.89

7114

4.

3301

27

4.61

8802

4.

7631

40

4.92

8203

5.

1961

52

6.35

0853

6.

9282

03

0.21

6506

0.

2706

33

0.32

4760

0.

3788

86

0.43

3013

0.

4871

39

0.54

1266

0.

6495

19

0.75

7772

0.

8118

99

0.86

6025

1.

0825

32

1.35

3165

1.

6237

98

1.89

4431

2.

1650

64

2.70

6329

3.

2475

95

3.78

8861

4.

3301

27

4.87

1393

5.

4126

59

5.95

3925

6.

4951

91

8.66

0254

0.23

8157

0.

2976

96

0.35

7235

0.

4167

75

0.47

6314

0.

5358

53

0.59

5392

0.

7144

71

0.83

3549

0.

8930

89

’ 0.

9526

28

1.19

0785

1.

4884

8 1

1.78

6177

2.

0838

74

2.38

1570

2.

9769

62

3.57

2355

4.

1677

47

4.76

3140

5.

3585

32

5.95

3925

6.

5493

17

7.14

4710

9.

5262

79

L

TABL

E 3

THR

EAD

D

ATA,

M

AN

D

MJ

PRO

FILE

S (M

ETR

IC

SCR

EW

THR

EAD

S)

(Con

t’d)

Cop

yrig

ht A

SM

E In

tern

atio

nal

Pro

vide

d by

IHS

und

er li

cens

e w

ith A

SM

EN

ot fo

r R

esal

eN

o re

prod

uctio

n or

net

wor

king

per

mitt

ed w

ithou

t lic

ense

from

IHS

--``-`-`,,`,,`,`,,`---

AMERICAN NATIONAL STANDARDS FOR SCREW THREADS

(Published by The American Society of Mechanical Engineers)

................................. TITLE OF STANDARD

Unified Inch Screw Threads (UN and UNR Thread Form) B1.1-1989

Screw Thread Gaging Systems for Dimensional Gages and Gaging for Unified Inch Screw Threads ................................ B1.2-1983(R1991)

Acceptability - Inch and Metric Screw Threads (UN. UNR. UNJ. M. and MJ) . . . . . . . . . . . B1.3M-1986 Acme Screw Threads ................................................................. B1.5-1988 Nomenclature. Definitions. and Letter Symbols for Screw Threads . . . . . . . . . . . . . . . Bl.7M-l984(R1992) Stub Acme Screw Threads ............................................................ 81.8-1988

Thread Engagement .......................................................... B1.9-1973(R1992) Unified Miniature Screw Threads ............................................... 81.10-1958(R1988)

Buttress Inch Screw Threads 7"/45" Form With 0.6 Pitch Basic Height of

..................................................

a ...............................................

Microscope Objective Thread 51.1 1-1958(R1989) Class 5 Interference-Fit Thread B1.12M-l987(R1992) Metric Screw Threads - M Profile B1.13M-l983(R1989)

Metric Screw Threads for Commercial Mechanical

Gages for Metric Screw Threads for Commercial Mechanical

........................................... Gages and Gaging for Metric M Screw Threads ................................ Bl.16M-l984(R1992)

Fasteners - Boundary Profile Defined ...................................... Bl.18M-l982(R1987)

Fasteners - Boundary Profile Defined ...................................... BI.19M-l984(R1992) Pipe Threads. General Purpose (Inch) ......................................... B1.20.1-1983(R1992) Dryseal Pipe Threads (Inch) .................................................. B1.20.3-1976(R1982) Dryseal Pipe Threads (Metric Translation of B1.20.3-1976) ...................... B1.20.4-1976(R1982) Gaging for Dryseal Pipe Threads (Inch) .............................................. B1.20.5-1991

of B1.20.5-1978) ............................................................... B1.20.6M-1984

Gages and Gaging for MJ Series Metric Screw Threads ............................... B1.22M-1985

and Rounding Dimensions ........................................................ B1.30M-1992

Gaging for Dryseal Pipe Threads (Metric Translation

Hose Coupling Screw Threads (Inch) B1.20.7-1991 Metric Screw Threads - MJ Profile B1.21M-1978

Screw Threads - Standard Practice for Calculating

................................................ .................................................

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asme b1 30_m_1992

Engineering