International Organization for Standardization (ISO)
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ISO 6157-2:1995
Scope
Establishes limits for various types of surface discontinuities on nuts with nominal thread diameters from 5 mm up to and including 39 mm. Applies also for all mechanical property classes according to ISO 898-2 and ISO 898-6.
ISO 6157-2:1995 history
1995ISO 6157-2:1995 Fasteners - Surface discontinuities - Part 2: Nuts