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Machine Processing - Tolerance Grades

Machine processing and tolerance grades.

A tolerance is the total permissible variation of size. where the tolerance is the difference between the limits of size.

Range of tolerance grades that various machine processes may produce under normal conditions:

Machine Processing - Tolerance Grades
Tolerance Grades
45678910111213
Lapping and Honing
Cylindrical Grinding
Surface Grinding
Diamond Turning
Diamond Boring
Broaching
Reaming
Turning
Boring
Milling
Planning and Shaping
Drilling

ANSI B4.1 Standard Tolerances are indicated in the diagram below:

Machine processing and tolerance grades - ANSI B4.1 Standard Tolerances

  • 1 in (inch) = 25.4 mm
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