5/16-18 X 2-1/4" Flat Head Cap Screws | Nylon Patch | Alloy Steel Thermal Black Oxide (100 / Pkg.)

Mutual ScrewSKU: 3136CSFPBB

Price:
Sale price$107.95per 100( $1.08 each)
Pieces 100
Measurement type Inch
Thread size 5/16-18
Length 2-1/4
Material Alloy Steel
Finish Thermal Black Oxide
Drive Hex Socket
Head style Flat
Thread style Partially Threaded
Weight 1.0 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 demanding assemblies, the Cap Screws Flat Socket Nylon Patch Alloy Thermal Black Oxide 5/16-18 X 2 1/4 delivers dependable holding power with insulation and abrasion resistance. Designed for electrical and mechanical applications, this flat socket cap screw blends strong alloy construction with a nylon patch and a durable thermal black oxide finish.

Key specifications

  • Thread size: 5/16-18
  • Length: 2 1/4" (2.25 in)
  • Head style: Flat Socket Cap Screw
  • Material: Alloy with Nylon Patch
  • Finish: Thermal Black Oxide

Benefits

  • High-strength alloy for reliable fastening in heavy-duty applications.
  • Nylon patch provides electrical insulation and vibration dampening where needed.
  • Thermal black oxide finish adds corrosion resistance and wear protection for longer service life.
  • Flat socket design offers a clean, recessed appearance and secure driver engagement.

Ideal applications

  • Automotive assemblies and automotive aftermarket projects
  • Industrial machinery and equipment housings
  • Electrical enclosures and panels requiring insulating fasteners
  • Any project needing a robust, corrosion-resistant fastener with vibration dampening

For best results, install using standard tools appropriate for 5/16-18 fasteners and follow general torque guidelines from the hardware manufacturer. This fastener is designed to pair with compatible components in environments demanding both strength and electrical insulation.

Can We Help?

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

Recently viewed