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

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

Mutual ScrewSKU: 3140CSFBB
Price:
$72.82per 100( $0.73 each)
Pieces 100
Measurement type Inch
Thread size 5/16-18
Length 2-1/2
Material Alloy Steel
Finish Thermal Black Oxide
Drive Hex Socket
Head style Flat
Thread style Partially Threaded
Weight 5.14 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

Cap Screws Flat Socket Alloy Thermal Black Oxide 5/16-18 X 2 1/2 are high-strength fasteners designed for dependable assembly in machinery, automotive, and industrial equipment. Featuring a flat socket head, these cap screws sit flush to maintain a clean, professional finish in tight spaces.

Constructed from alloy steel and finished with a thermal black oxide coating, they combine strength with a durable, low-gloss appearance suitable for wet, oily, or dusty environments where corrosion protection is adequate for standard industrial use.

Key Features

  • Thread size: 5/16-18 UNC
  • Length: 2-1/2 inches
  • Flat socket head cap screw
  • Material: Alloy steel
  • Finish: Thermal black oxide

Specifications

  • Thread: 5/16-18 UNC
  • Length: 2-1/2 in
  • Head style: Flat socket
  • Drive type: Hex socket
  • Material: Alloy steel
  • Finish: Thermal black oxide

Applications

  • Machinery assembly
  • Automotive and heavy equipment
  • Industrial manufacturing and maintenance

Why choose these cap screws? They provide a strong, reliable fastening solution with a low-profile head that reduces snag risk in confined spaces. The thermal black oxide finish adds a durable, professional appearance and helps conceal wear over time. Ideal for standard industrial environments where 5/16-18 UNC threads and 2-1/2" length are required.

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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