ACME Stub Threads Size Designation Table Chart | Engineers ...
ASME/ANSI B1.8-1988 (R2001) provides for the Stub Acme screw thread for those unusual applications where, due to mechanical or metallurgical considerations, a coarse pitch thread of shallow depth is required. The fit of Stub Acme threads corresponds to the Class 2G General Purpose Acme thread in American National Standard ANSI B1.5-1988.