Imperial 20139 USS Hex Head Cap Screw, Grade 5, 5/16x5, Pkg/50

buy nuts, bolts, screws & fasteners at cheap rate in bulk. wholesale & retail home hardware tools store. home décor ideas, maintenance, repair replacement parts
Zinc plated for corrosion resistance, Conforms to SAE Grade 5 physical and mechanical specifications, Thread pitch: 5/16-18 UNC, Pkg/50
SKU: 42619721
MFG: 20139
Shop more products by Imperial.

Best home hardware tools store to buy Nuts, Bolts, Screws & Fasteners. Save big with Life and Home discount coupons

Sold out
Sold Out
Request a Bulk Quote

Thank you for your quote request. We will be in touch.




  • Size: 5/16X5
  • Thread pitch: 5/16-18 UNC
  • Conforms to SAE Grade 5 physical and mechanical specifications
  • Zinc plated for corrosion resistance
  • Pack of 50

Technical Data:

  • 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)
  • D ecarburation: SAE J121
  • Discontinuities: SAE J1061

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: 20139
SKU: 42619721
Brand: Imperial