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ASME B1.13M-2001
- Metric Screw Threads-M Profile
- standard by ASME International, 08/01/2002
- Publisher: ASME
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This Standard contains general metric standards for a 60 deg. symmetrical screw thread with a basic ISO 68 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 4G/6G which is approximately equivalent to the inch class 3A but with an allowance applied. Formulation and tolerancing data is included for applications requiring other fits.