Property class
Material
Steel boltsISO 898-1 (JIS B 1051)In property class X.Y, X times 100 is the tensile strength, and that multiplied by Y/10 is the yield strength.Stainless steel fastenersISO 3506-1 (JIS B 1054-1)The rule differs from steel: the class number multiplied by 10 is the minimum tensile strength.Non-ferrous fastenersISO 8839 (JIS B 1057)Copper alloys and aluminium alloys. These are set by material group and alloy number, not by property class.Effect of temperatureJIS B 1054-1 Annex FMechanical properties away from room temperature. Only stainless steel has figures per temperature in the standard.
Notes
- Property classes are defined differently depending on the material. For steel, X×100 of
X.Yis the tensile strength; for stainless steel, ten times the class value is the minimum tensile strength; non-ferrous fasteners have no property class at all. - The values here are for room temperature. Mechanical properties change at high and low temperatures, so do not apply these values directly.
- Sources: JIS B 1051 (including Annex B), JIS B 1054-1 (including Annex F), JIS B 1057