Mutual Screw & Supply

1/4-20 X 1-3/8" Socket Cap Screws | Flat Head Hex Socket Drive | Fully Threaded | Alloy Steel Thermal Black Oxide (100 / Pkg.)

1/4-20 X 1-3/8" Socket Cap Screws | Flat Head Hex Socket Drive | Fully Threaded - Main image
$39.1 $52.13 In stock

These 1/4-20 x 1-3/8" 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 style: Fully Threaded
  • Thread size: 1/4-20
  • Length: 1-3/8"
  • 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 style: Fully Threaded
  • Thread size: 1/4-20
  • Length: 1-3/8"
  • Threads per inch: 20
  • 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 (4.2 / 5 · 5 reviews)

Emma ★★★★★

Got these for a jig I’m building, and the hex socket drive makes driving them into tight spots easy. The black oxide finish also seems more durable than the plain zinc ones I’ve used before.

Christopher ★★★★★

Bought these for a custom jig I'm building and the hex socket drive grabs perfectly with my Allen wrench, no stripping even on a few I torqued down hard. The 1-3/8" length is exactly what I needed for the through-holes on my fixture plate.

Chloe ★★★★★

The black oxide coating is even and consistent across every screw in the entire bag, and the flat head sits perfectly flush on my jig. For once, a socket cap screw that doesn’t strip out on the first tighten and holds at full torque.