Engineering Drawing

and Related Documentation

Practices

ASME Y14.6-2001

[Revision and Consolidation of ANSI Y14.6-1978 (R1998)

and ANSI Y14.6M-1981 (R1998)]

SCREW THREAD REPRESENTATION

An American National Standard

ASME Y14.6

ADOPTION NOTICE

ASME Y14.6, Screw Thread Representation, was adopted on 2 November 2001 for use by the Department of Defense, DoD. Proposed changes by DoD activities must be submitted to the DoD Adopting Activity: Commander, US Army TACOM-ARDEC, ATTN: AMSTA-AR-QAW-E, Picatinny Arsenal, NJ 07806-5000. Copies of this document may be purchased from The American Society of Mechanical Engineers (ASME), 22 Law Drive, P.O. Box 2900, Fairfield NJ 07007- 2900; https://www.asme.org.

Custodians: Adopting Activity:

Army — AR Army — AR

Navy — SA

Air Force — 16 (Project DRPR — 0361)

DLA — DH

Review Activities:

Army — AT, AV, CE, CR, EA, GL, MI, SM, TE Navy — AS, CH, EC, MC, OS, SH, TD, YD

Air Force — 11, 13, 19, 68, 70, 71, 80, 84, 99 DLA — CC, GS, IS

NSA — NS

AMSC N/A AREA DRPR

DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited.

A N A M E R I C A N N A T I O N A L S T A N D A R D

SCREW THREAD REPRESENTATION

ASME Y14.6-2001

[Revision and Consolidation of ANSI Y14.6-1978 (R1998)

and ANSI Y14.6M-1981 (R1998)]

Date of Issuance: September 23, 2002

The next edition of this Standard is scheduled for publication in 2006. There will be no addenda or written interpretations of the requirements 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 Standards 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 that provides an opportunity for additional public input from industry, academia, regulatory agencies, and the public-at-large.

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without the prior written permission of the publisher.

The American Society of Mechanical Engineers Three Park Avenue, New York, NY 10016-5990

Copyright © 2002 by

THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS

All Rights Reserved Printed in U.S.A.

CONTENTS

Foreword v

Committee Roster vi

1. General 1

   1. Scope 1

   2. Application 1

   3. Applicable Documents 1

   4. Definitions 2

2. Thread Types 2

   1. Straight Threads 2

   2. Taper Threads 2

   3. Acme Threads 2

   4. Stub Acme Threads 2

   5. Buttress Threads 2

3. Requirements 2

3.1

3.2

3.3

Tables

Thread Representation 2

Thread Specification 7

Dimensioning 15

1. Thread Series Designations 3

2. Designations for UN, UNJ, UNR, and N Thread Series 4

Figures

1. Simplified Representation of Threads 4

2. Schematic Representation of Threads 4

3. Detailed Representation of Threads 4

4. Simplified Representation of Assembled Threads 5

5. Multiple Thread Representations of Assembled Parts 5

6. Simplified Representation of Helical Coil Inserts 5

7. Simplified Representation of Taper Threaded Parts 5

8. Simplified Representation of Assembled Tapered Parts 5

9. Specifying Incomplete Thread Lengths 6

10. Specifying Shank and Incomplete Thread Lengths 6

11. Specifying Incomplete Thread Lengths and Shoulder Fillet Radius 6

12. Specifying Shank, Unthreaded, and Threaded Lengths and Undercut Diameter 6

13. Specifying Bottoming Relief Radii and Lengths 7

14. Detailed Representation of Helical Coil Inserts 7

15. Screw Thread Designation: Unified Inch Screw Thread, Right Hand 8

16. Screw Thread Designation: Metric External Thread, Right Hand 8

17. Screw Thread Designation: Metric Internal Thread, Right Hand 8

18. Acme Screw Thread Designation 13

19. Taper Thread Designation 14

20. Specifying External Taper Thread Type and Size 14

21. Specifying Internal Taper Thread Type and Size 14

22. Specifying External Taper Thread 14

23. Specifying External Thread With Special Gaging 15

24. Specifying Internal Taper Thread Designations 15

25. Specifying Internal Thread With Special Gaging 15

26. Specifying Tap Hole, Thread, and Special Gaging 15

27. Specifying Special Orifice, Standard Tap Hole, and Thread 15

28. Specifying Thread Length 16

29. Specifying External Chamfer 17

30. Specifying External Chamfer for Rolled Thread Blanks 17

31. Specifying Internal Thread Hole Depth, Size, and Countersink 17

    
    

    FOREWORD

    
    

    This Standard establishes American National Standard drafting practices for depicting screw threads on drawings and other documents. It is beyond the scope of this Standard to present engineering and manufacturing specifications for screw threads.

    The original issue of this Standard was approved on December 13, 1957. It was designated ASA Y14.6-1957, and then redesignated ANSI Y14.6-1957 after the American Standards Association (ASA) became the American National Standards Institute (ANSI) in 1969. The 1957 document was revised and approved as an American National Standard on July 26, 1978. It was designated ANSI Y14.6-1978. A metric supplement was approved on September 21, 1981 and was designated ANSI Y14.6aM-1981.

    This revision consolidates the metric supplement, Y14.6aM, and the basic Y14.6 Standard. It also updates these standards in accordance with the latest issues of ASME B1 series Screw Thread Standards, and provides corrections where necessary.

    Suggestions for the improvement of this Standard will be welcome. They should be sent to The American Society of Mechanical Engineers, Attn: Secretary, Y14 Main Committee, Three Park Avenue, New York, NY 10016-5990.

    This revision was approved as an American National Standard on November 2, 2001.

    
    

    ASME STANDARDS COMMITTEE Y14

    Engineering Drawing and Related Documentation Practices

    
    

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

    
    

    OFFICERS

    F. Bakos, Jr., Chair

    K. E. Wiegandt, Vice Chair

    C. J. Gomez, Secretary

    
    

    COMMITTEE PERSONNEL

    1. R. Anderson, Dimensional Control System, Inc.

J. B. Baker, Textron Automotive

F. Bakos, Jr., Eastman Kodak Co.

D. E. Bowerman, Copeland Corp.

J. V. Burleigh, The Boeing Co.

R. A. Chadderdon, Southwest Consultants

M. E. Curtis, Jr., Rexnord Corp.

D. E. Day, Monroe Community College

C. W. Ferguson, WM Education Services

L. W. Foster, L. W. Foster Associates, Inc.

C. J. Gomez, The American Society of Mechanical Engineers

B. A. Harding, Purdue University

K. S. King, Naval Surface Warfare Center, Dahlgren Division

A. Krulikowski, General Motors Powertrain

H. S. Lachut, ABB Combustion Engineering Inc.

J. G. Liska, Aerojet Propulsion, Division of Gencorp

P. J. McCuistion, Ohio University

P. E. McKim, Caterpillar, Inc.

E. Niemiec, MTD Products, Inc.

R. L. Nieukirk, Alternate, Caterpillar, Inc.

R. L. Rickman, Oklaloosa-Walton Community College

R. W. Stockdale, Consultant

R. P. Tremblay, U. S. Department of the Army, ARDEC

G. H. Whitmire, Gary Whitmire Associates

K. E. Wiegandt, Sandia National Laboratory

B. A. Wilson, The Boeing Co.

P. Wreede, Raytheon Systems Co.

SUBCOMMITTEE 6—SCREW THREAD REPRESENTATION

B. A. Harding, Chair, Purdue University

D. A. Clever, Deere and Co.

A. Herskovitz, Consultant

E. Schwartz, Consultant

G. H. Whitmire, Consultant

ASME Y14.6-2001

ENGINEERING DRAWING AND RELATED DOCUMENTATION PRACTICES

SCREW THREAD REPRESENTATION

1. GENERAL

   
   

   1. Scope

      This Standard establishes requirements for pictorial representation, specification, and dimensioning of screw threads on drawings; it is not concerned with standards for dimensional control of screw threads. Information helpful in the design and selection of screw threads to meet specific requirements is included in the B1 series of the ASME Standards for Screw Threads (see para. 1.3).

      
      

   2. Application

      Straight Unified inch (UN/UNR/UNJ form) and met- ric (M/MJ form) screw threads are emphasized in this Standard in consideration of their wide use and general purpose applications. The same drafting practices apply to straight and taper threads, Acme, Stub Acme, But- tress, thread insert, and interference fit threads except for differences noted.

      
      

   3. Applicable Documents

The following documents form a part of this Standard to the extent specified herein. The latest edition shall apply.

AS 71051, Pipe Threads, Taper, Aeronautical National Form, Symbol ANPT, Design and Inspection Standard

Publisher: Society of Automotive Engineers (SAE), 400 Commonwealth Drive, Warrendale, PA 15096-0001

ASME B1.1, Unified Inch Screw Threads (UN and UNR Thread Form)

ASME B1.3M, Screw Thread Gaging Systems for Dimensional Acceptability-Inch and Metric Screw Threads (UN, UNR, M, and MJ)

ASME B1.5, Acme Screw Threads

ASME B1.7M, Nomenclature, Definitions, and Letter Symbols for Screw Threads

ASME B1.8, Stub Acme Screw Threads ASME B1.9, Buttress Inch Screw Threads

ASME B1.10M, Unified Miniature Screw Threads ASME B1.11, Microscope Objective Thread ASME B1.12, Class 5 Interference-Fit Thread

ASME B1.13M, Metric Screw Threads — M Profile ASME B1.15, Unified Inch Screw Threads (UNJ Thread

Form)

ASME B1.20.1, Pipe Threads, General Purpose (Inch) ASME B1.20.3, Dryseal Pipe Threads (Inch)

ASME B1.20.7, Hose Coupling Screw Threads (Inch) ASME B1.21M, Metric Screw Threads: MJ Profile ASME B18.29.1, Helical Coil Screw Thread Inserts

(Inch Series)

ASME B18.29.2M, Helical Coil Screw Thread Inserts (Metric Series)

ASME Y14.5M, Dimensioning and Tolerancing

Publisher: The American Society of Mechanical Engi- neers (ASME International), Three Park Avenue, New York, NY 10016-5990; ASME Order Department: 22 Law Drive, Box 2300, Fairfield, NJ 07007-2300

CGA V-1, Compressed Gas Cylinder Valve Outlet and Inlet Connections

Publisher: Compressed Gas Association (CGA), 4221 Walney Road, Chantilly, VA 20151-2923

FED-STD-H28, Screw-Thread Standards for Federal Services

FED-STD-H28/2, Unified Inch Screw Threads — UN and UNR Thread Forms

FED-STD-H28/5, Unified Miniature Screw Threads FED-STD-H28/7, Pipe Threads, General Purpose FED-STD-H28/8, Dryseal Pipe Threads

FED-STD-H28/9, Gas Cylinder Valve Outlet and Inlet Threads

FED-STD-H28/10, Hose Coupling and Fire Hose Cou- pling Screw Threads

FED-STD-H28/12, Acme Threads

FED-STD-H28/13, Stub Acme Threads

FED-STD-H28/14, Buttress Screw Threads — 7°/45° Flank Angles

FED-STD-H28/16, Microscope Objective and Nose- piece Threads, 0.8000-36AMO

1