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5/16"-18 x 2-1/4" KM-USA High Head Grade 8 (USS) Hex Head Cap Screw - 50 Pack
5/16"-18 x 2-1/4" KM-USA High Head Grade 8 (USS) Hex Head Cap Screw - 50 Pack thumbnail 1
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5/16"-18 x 2-1/4" KM-USA High Head Grade 8 (USS) Hex Head Cap Screw - 50 Pack

Diameter: 5/16"
Length: 2-1/4"
Thread Type: Coarse
Package Quantity: 50
View All Product Variations
Item #: 380518
Package Weight: 2.7 lbs

Complete Your Assembly

Product Details

To complete your set up check out our Fastener Shop Setups and our KM-USA High Head Cap Screw Assortments.

To complete your assembly:

  • 34-3805 5/16"-18 Grade 8 (USS) Hex Nut - 100 Pack
  • 34-4805 5/16"-18 Grade C (USS) Ultra-Lock Nut - 50 Pack
  • 34-8405 5/16"-18 Grade 8 (USS) Nylon Insert Lock Nut - 50 Pack
  • 37-3805 5/16" Grade 8 (USS) Yellow Zinc Alloy Steel Flat Washer - 100 Pack
  • 37-3905 5/16" Grade 8 (SAE) Yellow Zinc Alloy Steel Flat Washer - 100 Pack
  • 37-4805 5/16" Grade 8 Yellow Zinc Alloy Steel Split Lock Washer - 100 Pack

Product Features:

  • 100% made in the U.S.A. from raw material melted and rolled in the U.S.A.
  • 100% lot traceability back to raw material.
  • 20% higher head provides increased wrenchability.
  • Special high strength chrome alloy steel.
  • 30° head point provides easier alignment in a threaded hole or with a hex nut.
  • Roll formed threads with 60° flank angle provide superior fatigue resistance.
  • UN Class 2A formed thread fit; post plating is considered Class 3A per ASME B1.1-2003 (R2008) and provides enhanced thread engagement.
  • RoHS Compliant Zinc-Yellow Trivalent Plated.
  • Tensile strength 150,000 P.S.I. minimum.

Please note that supply chain shortages may require us to temporarily substitute some non-domestic products, including in assortments.

Product Specification

Brand:  Kimball Midwest
Category:  Grade 8 Hex Head Cap Screws
Diameter:  5/16"
Finish:  Zinc, Yellow Trivalent
Grade:  8
Head Style:  Hex Head
Length:  2-1/4"
Material:  Medium Carbon Alloy Steel
Measurement Type:  USS
Minimum Thread Length:  7/8"
Series:  KM-USA High Head
Tensile Strength:  150,000 psi
Thread Length:  Partially Threaded
Thread Pitch:  18
Thread Size:  5/16"-18
Thread Type:  Coarse
Warranty:  30 Day
Width Across Flats:  1/2"

Product Documents

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