Hex Head Cap Screws Grade 8 Steel Plain 5/16-18 x 4
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Hex Head Cap Screws Grade 8 Steel Plain 5/16-18 x 4

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[400 BULK] Hex Head Cap Screws Grade 8 Steel Plain 5/16-18 x 4

Mutual ScrewSKU: 3164CH8PBB
Price:
$150.75per 400( $0.38 each)
Pieces 400
Measurement type Inch
Thread size 5/16-18
Diameter 5/16
Length 4
Material Steel
Grade Grade 8
Finish Plain
Head style Hex
Threads per inch 18
Thread style Partially Threaded
Weight 37.0 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

Engineered for strength and reliability, the Hex Head Cap Screws Grade 8 Steel Plain 5/16-18 x 4 delivers high-torque performance for demanding assemblies. Crafted from Grade 8 steel with a plain (unplated) finish, these screws provide superior tensile strength and durability for mechanical, automotive, and industrial applications.

Designed for high-load fastening, these hex head cap screws resist loosening under vibration and heavy use, making them ideal for critical equipment assemblies and maintenance projects.

Specifications

  • Head type: Hex
  • Material: Grade 8 steel
  • Finish: Plain (unplated)
  • Diameter: 5/16 in
  • Thread pitch: 18 TPI (5/16-18 UNC)
  • Length: 4 in
  • Usage: Hex Head Cap Screws

Applications

Ideal for machinery, automotive repair, equipment mounting, and construction projects that demand a strong, dependable fastener.

Installation and care

  • Compatibility: Use with nuts and washers rated for 5/16-18 threads.
  • Torque: Apply torque per standard Grade 8 fastener guidelines to achieve proper clamping force without over-tightening.

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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