Imperial 20131 USS Hex Head Cap Screw, Grade 5, 5/16x2-1/2, Pkg/100

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Conforms to SAE Grade 5 physical and mechanical specifications, Zinc plated for corrosion resistance, Size: 5/16X2-1/2, Thread pitch: 5/16-18 UNC, Pkg/100
SKU: 42619662
MFG: 20131
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  • Size: 5/16X2-1/2
  • Thread pitch: 5/16-18 UNC
  • Zinc plated for corrosion resistance
  • Conforms to SAE Grade 5 physical and mechanical specifications.
  • Pack of 100

Technical Data:

  • D ecarburation: SAE J121
  • Discontinuities: SAE J1061
  • Material and Mechanical Properties of SAE J429
  • Dimensions: ANSI/ASME B18.2.1 Hex Head Cap Screws
  • Th reads: Radius Root Class 2A to ANSI/ASME B1.1
  • Proof Load: 1/4" - 1" Nominal Diameter 85,000 psi; over 1" Nominal Diameter 74,000 psi
  • Hardness: 1/4" - 1" Nominal Diameter Rockwell C25-C34; over 1" Nominal Diameter C19-C30
  • Tensile: 1/4" - 1" Nominal Diameter 120,000 psi (minim um) over 1" Nominal Diameter 105,000 psi (minimum)

Rule of thumb to figure bolt thread length:

  • For bolts under 6": Twice the bolt diameter plus a 1/4"
  • For bolts over 6": Twice the bolt diameter plus a 1/2"
  • This gives you the approximate bolt thread length available


MFR: 20131
SKU: 42619662
Brand: Imperial