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Tolerance class | ||||||||||||
Tolerance class for plug gauges (internal threads) | Tolerance class for ring gauges (external threads) | Application | ||||||||||
1B | 1A | where quick assembly is needed even when threads are dirty / damaged, wide tolerances for male and female threads | ||||||||||
2B | 2A | corresponds to medium fit and used for general applications which requires free assembly | ||||||||||
3B | 3A | where closer fit is required |