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  • ASTM A325 Heavy Hex Bolts
    • Structural Bolts, Steel, Heat Treated, 120/105 ksi Minimum Tensile Strength
  • ASTM A490 Heavy Hex Bolts
    • Structural Bolts, Alloy Steel, Heat Treated, 150 ksi Minimum Tensile Strength


  • ASTM F436 Flat Washers
    • Hardened Steel Washers
  • ASTM F959 Direct Tension Indicators (DTIs)
    • Raised arches, or “bumps,” on washers that deform when a bolt is tightened sufficiently
    • Better than the turn-of-nut method for bolt tightening. Use a feeler gauge to check for proper tensioning
  • ASTM F959 Squirter Direct Tension Indicators (Squirter® DTIs and DuraSquirt® DTIs)
    • Like standard DTIs, with the addition of orange silicone that provides a visual indicator of correct tensioning—enabling quicker installation and inspection
  • Nuts
    • A563 Grade DH Heavy Hex Nuts
      • Carbon Steel Nuts
    • A194 Grade 2H Heavy Hex Nuts (acceptable substitute for A563 Grade DH)
      • Carbon Steel Nuts for Bolts for High Pressure or High Temperature Service
Structural Fasteners
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Structural Fasteners