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BS ISO 965-3:2021
ISO general purpose metric screw threads. Tolerances Limit deviations for screw threads (British Standard)
This document specifies limit deviations for pitch and crest diameters for ISO general purpose metric screw threads (M) conforming to ISO 261 having basic profile in accordance with ISO 68-1.
The limit deviations specified are derived from the fundamental deviations and tolerances specified in ISO 965-1.
This document is applicable to ISO general purpose metric screw threads with the recommended tolerance classes.
British Standards Institution [bsi]