Abstract / scope
Specifies the widths to be used in the respective product standards; it sets out a logical ratio between underhead (or nut) bearing area and the tensile stress area of the screw thread.
ISO 272:1982Published
Fasteners — Hexagon products — Widths across flats
Éléments de fixation — Produits hexagonaux — Dimensions des surplats
A new edition is under development: ISO/DIS 272.