[225 PKG] Hex Head Cap Screws Grade 5 Steel Plain 5/16-18 x 8

Mutual ScrewSKU: 31128CH5PBB

Price:
Sale price$166.92per 225( $0.74 each)
Pieces 225
Measurement type Inch
Thread size 5/16-18
Diameter 5/16
Length 8
Material Steel
Grade Grade 5
Finish Plain
Head style Hex
Threads per inch 18
Thread style Partially Threaded
Weight 40.0 lb

WARNING: This product can expose you to chemicals including lead and lead compounds, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to https://www.P65Warnings.ca.gov.

Description

Hex Head Cap Screws Grade 5 Steel Plain 5/16-18 x 8 — a high-strength fastener designed for durable, reliable joining in mechanical assemblies, automotive, and construction projects.

Featuring a coarse 5/16-18 UNC thread and a robust hex drive, these screws deliver strong clamping force and easy installation across a variety of materials. The plain finish means there is no coating, making them suitable for finishing processes or future plating as needed.

Specifications

  • Size: 5/16-18
  • Length: 8 inches
  • Thread type: Coarse UNC (18 TPI)
  • Head: Hex head cap screw
  • Material: Grade 5 steel
  • Finish: Plain (uncoated)
  • Drive: Hex

Applications

Ideal for heavy-duty assemblies in machinery, automotive components, and equipment mounting where a secure, high-strength fastener is required. The plain finish provides flexibility for painting, plating, or additional finishing as part of your manufacturing process.

Care and Installation

  • Use the appropriate hex driver to achieve proper seating and avoid stripping.
  • Store in a dry environment to minimize rust on uncoated steel.
  • Torque should be set according to your engineering specifications and material compatibility.

Can We Help?

If you’re not sure that this product is right for you, give us a call!
800-222-0324

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