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Hex Head Cap ScrewThread Size 18, Length under Head 2-1/2", Stainless Steel, PK, 5 close
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Hex Head Cap ScrewThread Size 18, Length under Head 2-1/2", Stainless Steel, PK, 5

Price $43.35 / pkg. of 5

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  • Item # 5NA58
  • Mfr. Model # CCLDZZZZOAAZZ
  • UNSPSC # 31161501
  • Catalog Page # N/A
  • Shipping Weight 0.3 lbs.
Country of Origin USACountry of Origin is subject to change.
Note: Product availability is real-time updated and adjusted continuously. The product will be reserved for you when you complete your order. More

Technical Specs

  • ItemHex Head Cap Screw
  • Head TypeHex
  • Diameter5/16"
  • Grade18-8 (304)
  • MaterialStainless Steel
  • FinishPlain
  • Thread Size18
  • Thread TypeUNC (Coarse)
  • Length under Head2-1/2"
  • Thread Length7/8"
  • Head Height13/64"
  • Head Width37/64"
  • Thread StylePartially Threaded
  • Thread DirectionRight Hand
  • Seal TypeO-Ring
  • Seal MaterialSilicone Rubber
  • Temp. Range-160 Degrees to 500 Degrees F
  • Tensile Strength70,000 psi
  • Rockwell HardnessB70
  • Meets/ExceedsROHS Compliant
  • Dia./Thread Size5/16"-18
  • Min. Thread Length7/8"
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Compliance and Restrictions



The hex head cap screw is a common fastener in construction and machine assembly. The screw head is designed to fit ratchet or spanner torque wrenches for tightening to exact specifications. As an alternative to welds or rivets, cap screw fasteners offer easy disassembly for repairs and maintenance.

These screws are manufactured with 18-8 stainless steel, which helps them resist rust and corrosion. They are recommended for prolonged outdoor use and exposure to salt spray and chemical fumes.

Each screw also features a vibration-resistant, silicone O-ring under the head to seal out air, water, lubricants, and liquid and gas contaminants.

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