Mutual Screw & Supply

5/16-18 X 1-1/4" Socket Cap Screws | Flat Head Hex Socket Drive | USA Made | Alloy Steel Thermal Black Oxide (100 / Pkg.)

5/16-18 X 1-1/4" Socket Cap Screws | Flat Head Hex Socket Drive | USA Made | - Main image
$55.64 $78.37 In stock

These 5/16-18 x 1-1/4" 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
  • Head style: Flat Head
  • Drive: Hex Socket Drive
  • Thread size: 5/16-18
  • Length: 1-1/4"
  • Applications: Machinery, tooling, jigs, and precision assemblies

Specifications

  • Product type: Socket Cap Screws
  • Head style: Flat Head
  • Material: Alloy Steel
  • Finish: Thermal Black Oxide
  • Drive type: Hex Socket Drive
  • Thread size: 5/16-18
  • Length: 1-1/4"
  • 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 (4.8 / 5 · 5 reviews)

Victoria ★★★★★

The black oxide finish on these gives them a nice, uniform look right out of the bag, which I appreciate for visible tooling. I've torqued a few down hard on a fixture and the hex drive hasn't stripped once. Solid fasteners for the price, and the 100-count pack means I've got spares for the next pro

Nicholas Y. ★★★★★

Used a full pack on a jig build and every single screw threaded clean without a single stripped head. The hex socket drive bites perfectly, and the thermal black oxide finish held up to shop oil without spotting. Glad I went with the USA made option this time.

Christopher ★★★★★

The black oxide finish on these is even and smooth, no flaking or uneven spots across the whole hundred. They seat flush in my jig plates without any binding on the flat head, and the alloy steel feels solid under torque.