ASME B1.13M-2005 Metric Screw Threads: M Profile

An American National Standard. The American Society of Mechanical Engineers (ASME). Revision of ASME B1.13M-2001. 82p. This Standard contains general metric standards for a 60 deg symmetrical screw thread with a basic ISO 68-1 profile designated M profile. The M profile threads of tolerance class 6H/6g are intended for metric applications where inch class 2A/2B have been used. At the minimum material limits, the 6H/6g results in a looser fit than the 2A/2B. Tabular data is also provided for a tighter tolerance fit external thread of class 4g6g, which is approximately equivalent to the inch class 3A but with an allowance applied.