Machine Processing - 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:
| 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:
- 1 in (inch) = 25.4 mm
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