Mutual Screw & Supply

1/4-28 X 3/8" Socket Cap Screws | Hex Socket Drive | Nylon Pellet | Fully Threaded | Alloy Steel Thermal Black Oxide (100 / Pkg.)

1/4-28 X 3/8" Socket Cap Screws | Hex Socket Drive | Nylon Pellet | Fully - Main image
$86.02 $121.16 In stock

These 1/4-28 x 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
  • Drive: Hex Socket Drive
  • Thread style: Fully Threaded
  • Thread size: 1/4-28
  • Length: 3/8"
  • 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: Fully Threaded
  • Thread size: 1/4-28
  • Length: 3/8"
  • Threads per inch: 28
  • 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)

Christopher U. ★★★★★

Finally, a fastener that holds its torque on my jig without stripping—that nylon pellet keeps things snug even after repeat adjustments. The black oxide finish also feels slick and settled into the machine nicely, no residue on my fingers. These are going straight into my precision assembly kit for

Sofia A. ★★★★★

The nylon pellet locking feature is exactly what I needed for a jig that kept vibrating loose—these hold firm without any thread locker mess. All 100 came out of the bag with a consistent finish and no burrs, and the 3/8" length sat perfectly flush in my fixture.

Henry N. ★★★★★

The black oxide finish is a nice touch—they look clean and uniform straight out of the bag, and the hex socket drive seated perfectly in my allen key. I’ve been using them to hold a jig together under constant vibration and not one has loosened up on me yet. Solid little screws for the price.