Mutual Screw & Supply

5/16-18 X 2-1/4" Socket Cap Screws | Hex Socket Drive | Nylon Patch | Partially Threaded | Alloy Steel Thermal Black Oxide (100 / Pkg.)

5/16-18 X 2-1/4" Socket Cap Screws | Hex Socket Drive | Nylon Patch | Partially - Main image
$71.21 $97.55 In stock

These 5/16-18 x 2-1/4" socket cap screws are manufactured from Alloy Steel Thermal Black Oxide, featuring a hex socket drive. They are well suited to machinery, tooling, jigs, and precision assemblies.

  • Material and finish: Alloy Steel Thermal Black Oxide
  • Drive: Hex Socket Drive
  • Thread style: Partially Threaded
  • Thread size: 5/16-18
  • Length: 2-1/4"
  • Applications: Machinery, tooling, jigs, and precision assemblies

Specifications

  • Product type: Socket Cap Screws
  • Material: Alloy Steel
  • Finish: Thermal Black Oxide
  • Drive type: Hex Socket Drive
  • Thread style: Partially Threaded
  • Thread size: 5/16-18
  • Length: 2-1/4"
  • Threads per inch: 18
  • Measurement type: Inch
  • Pack quantity: 100 per package
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Standard Shipping · United States: $0.00

Express Shipping · United States: $3.99

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United States · Return window (days after delivery): 30. Return method: By mail. Return postage: Seller pays.

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Customer Reviews (5.0 / 5 · 5 reviews)

Zoe ★★★★★

The black oxide finish blends in perfectly on my jig, and the partial threading gives just the right grip for the clamping pressure I need.

Harper ★★★★★

The nylon patch really does hold them tight once seated, so I don't have to worry about vibration loosening things on my jig. I was pleasantly surprised how consistent the threading is across all 100 pieces—usually you get a few duds in a pack this size.

Hazel W. ★★★★★

The black oxide finish on these screws gives them a nice, non-reflective look, and the nylon patch held them firmly in place during assembly without any extra threadlocker. They threaded cleanly into my steel jig frame and seated flush with the surface.