Machine Processing and Tolerance Grades

Relation of machine processes to tolerance grades

Machining processes that under normal conditions will produce work within the tolerances indicated.

Tolerance Grades
4 5 6 7 8 9 10 11 12 13
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:

ANSI B4.1 Standard Tolerances

  • 1 in (inch) = 25.4 mm

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