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2.75-8 Stub Acme M2 - 2G

2.75-8 Stub Acme M2 - 2G

2.75-8 Stub Acme M2 - 2G

(OP)
Can anyone tell me if the thread form of Stub Acme M2 and standard Stub Acme are the same? I know the pitch and minor diameter's are different, but what about the thread form itself? Thanks in advance.

RE: 2.75-8 Stub Acme M2 - 2G

Check out Machinery's Handbook, it has all the thread forms in detail - including ACME.

RE: 2.75-8 Stub Acme M2 - 2G

They are not.

                2.750 - 8 Stub Acme-2G
                 c/w 45 Deg End Chmf
       EXTERNAL (A)                INTERNAL (B)
Major Dia. 2.7500/2.7437     Minor Dia. 2.6750/2.6812
Pitch Dia. 2.6992/2.6786     Pitch Dia. 2.7125/2.7331
Minor Dia. 2.6550/2.6344     Major Dia. 2.7700/2.7906

               2.750 - 8 Stub Acme-2G-M2
                  c/w 45 Deg End Chmf
       EXTERNAL (A)                INTERNAL (B)
Major Dia. 2.7500/2.7437     Minor Dia. 2.6875/2.6938
Pitch Dia. 2.7055/2.6849     Pitch Dia. 2.7188/2.7393
Minor Dia. 2.6675/2.6469     Major Dia. 2.7700/2.7906

Both have the same lead for single start thread.  The M2 is somewhat taller and fatter in the root of the thread (0.0413,0.0527), compared with the standard Stub Acme alternative (0.0475, 0.0511).  But both use the same wire in the three wire measure when gauging, 0.07217 diameter.  All measures given are imperial inches.

Hope this helps.

Regards,
Cockroach

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