Abstract

Specifies requirements for parallel screw threads having the Unified thread form for the diameter size range No. 0 (0.060 in) to 6 in inclusive. Limits of size for the Unified coarse, fine, extra fine, and constant pitch screws and a supplementary series of Unified threads of diameter greater than 6 in are given. It also covers screw gauges, associated check and setting gauges, and plug gauges with information being given on types of gauges, materials and hardness, general gauge design requirements, marking, and general notes on inspection of screw threads. Appendices give the basis of tabulated values, examples for calculating the limits of size of untabulated screw threads, notes on the production of external threads, notes on pitch and flank angle errors, notes on recommended system for gauging coated threads, and the limiting dimension of screw gauges for the more commonly used Unified threads.

RECONFIRMATION NOTICE
Technical Committee ME-029 has reviewed the content of this publication and in accordance with Standards Australia procedures for reconfirmation, it has been determined that the publication is still valid and does not require change.
Certain documents referenced in the publication may have been amended since the original date of publication. Users are advised to ensure that they are using the latest versions of such documents as appropriate, unless advised otherwise in this Reconfirmation Notice.
Approved for reconfirmation in accordance with Standards Australia procedures for reconfirmation on 16 June 2017.
The following are represented on Technical Committee ME-029:
Association of Accredited Certification Bodies
Association of Wall and Ceiling Industries of Australia
Australian Chamber of Commerce and Industry
Australian Engineered Fasteners and Anchors Council
Australian Industry Group
Australian Steel Institute
AUSTROADS
Bureau of Steel Manufacturers of Australia
Galvanizers Association of Australia
Materials Australia
National Association of Steel-Framed Housing
National Association of Testing Authorities Australia
New Zealand Heavy Engineering Research Association
Society of Automotive Engineers- Australasia
Steel Construction New Zealand
Swinburne University of Technology

Scope

This Standard specifies requirements for parallel screw threads, associated gauges, and gauging practice, having the Unified thread form and covering the diameter size range No 0 (0.060 in) to 6 in inclusive.

The Standard gives information on tolerances, deviations, thread classes, and designations.

A supplementary series of Unified threads (UNS) is given in Appendix A for guidance on Unified threads of diameter greater than 6 in, and non-standard diameter/pitch combinations, which may be required for special applications.

Appendices give the basis of the tabulated values (Appendix B), examples for calculating the limits of size of untabulated screw threads (Appendix C), notes on the production of external threads (Appendix D), notes on pitch and flank angle errors (Appendix F), notes on the function and checking of gauges (Appendix E), notes on a recommended system for gauging coated threads (Appendix G), notes on the setting of adjustable screw ring gauges (Appendix H), and the limiting dimensions of screw gauges for the more commonly used Unified threads (Appendix I).

NOTES:
1. Unified screw threads are also known as the ISO inch series screw threads. These screw threads are obsolescent and should not be used in new designs.
2. Because of the methods adopted for rounding the tabulated values (see Appendix B), the values for the various parameters given in the tables are to be taken as authoritative for the application of this Standard.
3. The information given in Appendix A may also be used for calculating screw thread parameters for diameters greater than 6 in.

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	Standards Australia
ProductNote	Reconfirmed 07/07/2017. This standard has been reconfirmed in Australia in 2017 and remains current in New Zealand. Reconfirmation Notice 07/07/2017
Pages
ISBN
Committee	ME-028
Supersedes	DR 87198 AS B121.1-1962 AS B133.1-1963 AS B133.2-1963 AS B121.4-1965 AS B133.3-1966