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Overview ISO 6157-1:1988 - "Fasteners - Surface discontinuities - Part 1: Bolts, screws and studs for general requirements" defines permissible surface discontinuities and inspection principles for b…
Overview ISO 6157-2:1995 - “Fasteners - Surface discontinuities - Part 2: Nuts” defines acceptable limits and inspection practices for surface defects on nuts. It covers nuts with nominal thread diam…
Overview ISO 6157-3:1988 - Fasteners: Surface discontinuities - Part 3 covers acceptance limits, inspection and sampling for surface discontinuities specifically in bolts, screws and studs for specia…
1 Scope This part of ISO 6157 establishes limits for various types of surface discontinuities on nuts. It applies to nuts with – nominal thread diameters from 5 mm up to and including 39 mm; – produc…