Express Software Production

ThreadSpecs3 ™


ESP Web Site Overview Profiles Wires

Acme Threads

Acme threads are characterized in part by short thread height and 14.5° flank angles. Altogether, the software supports five related profiles: General Purpose Acme, Centralizing Acme, Stub Acme, Stub Acme Modified Form 1, and Stub Acme Modified Form 2. All profiles and tolerance classes have allowances for both external and internal threads.

(In the table, p = pitch.)
Profile Thread Height Tolerance Classes Product Reference
General Purpose Acme .5 x p 2G,3G,4G ASME B1.5-1997
Centralizing Acme .5 x p 2C,3C,4C ASME B1.5-1997
Stub Acme .3 x p 2G,3G,4G ASME/ANSI B1.8-1988
Stub Acme Modified Form 1 .375 x p 2G,3G,4G ASME/ANSI B1.8-1988
Stub Acme Modified Form 2 .25 x p 2G,3G,4G ASME/ANSI B1.8-1988

Gage References : For all profiles, see the product references, except :


Note on using this software : Multi-Start Threads

The software has an option to use Nonmandatory Appendix B of ASME 1.5-1997. Otherwise, this software does not apply Appendix B, so dimensions are calculated the same as for single-start threads.


Gages

Working Thread Rings are used to gage external product threads. The "GO" ring should assemble with the product it is gaging, whereas the "NOT GO" ring should not. Generally, the minimum major diameter is specified, without a tolerance.

Working Thread Plugs are used to gage internal product threads. The "GO" plug should assemble with the product it is gaging, whereas the "NOT GO" plug should not. Generally, the maximum minor diameter is specified, without a tolerance.

Setting Rings are used to set indicating gages for internal product threads. GO rings are used to set gages to the maximum material size, NOT GO for the minimum material size. Generally, the minimum major diameter is specified, without a tolerance.

Setting Plugs are used to set indicating gages for external product threads, in addition to adjustable working ring gages. GO plugs are used to set gages to the maximum material size, NOT GO for the minimum material size. Generally, the maximum minor diameter is specified, without a tolerance.


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