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Property classes of stainless steel fasteners

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.
ClassMain steel gradesProperty classApplicable nominal diameterTensile strength
Min. [N/mm2]		0.2 % proof strength
Min. [N/mm2]

Notes

  • The main steel grades are given for reference only. Ferritic-austenitic (duplex) grades are outside the scope of JIS B 1054.
  • The martensitic grades (C1, C3, C4) and the ferritic grade (F1) have different upper limits on nominal diameter. F1 goes up to 24 mm, austenitic grades up to 39 mm.
  • Source: JIS B 1054-1
Property classes of stainless steel fasteners | Updraft - Mechanical Engineering Calculators