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ASTM F593

  • Standard Specification for Stailness Steel Bolts, Hex Cap Screws and Studs.

    ASTM F593 covers seven alloy groups of stainless steel bolting. This will only address Alloy Groups 1(304ss only) and 2(316ss only) in the Cold Worked condition as these are common to Bay Standard. Complete information can be found in the ASTM F593 standard.

  • Alloy Groups Covered

    Group Alloy Condition
    1 304 Stainless Cold Worked
    2 316 Stainless Cold Worked
  • ASTM F593 Mechanical Properties

    Alloy Group Condition Marking Diameter Tensile, Ksi Yield, Ksi Rockwell Hardness
    1 CW1 F593C 1/4 to 5/8 100 to 150 65 B95 to C32
    304ss CW2 F593D 3/4 to 1-1/2 85 to 140 45 B80 to C32
    Alloy Group Condition Marking Diameter Tensile, Ksi Yield, Ksi Rockwell Hardness
    2 CW1 F593G 1/4 to 5/8 100 to 150 65 B95 to C32
    316ss CW2 F593H 3/4 to 1-1/2 85 to 140 45 B80 to C32
  • ASTM F593 Chemical Properties

    Element Group 1(304ss) % Group 2(316ss) %
    Carbon(Max) 0.08 0.08
    Manganese 2.00 2.00
    Phosphorus 0.045 0.045
    Sulfur 0.030 0.030
    Silicon 1.00 1.00
    Chromium 18.0 to 20.0 16.0 to 18.0
    Nickel 8.0 to 10.5 10.0 to 14.0
    Copper 1.00 N/A
    Molybdenum N/A 2.00 to 3.00
  • ASTM F593 Recommended Hardware

    Nuts Washers
    ASTM F594 304ss or 316ss 304ss or 316ss