Mutual Screw & Supply

1/4-20 X 3/8" Socket Cap Screws | Hex Socket Drive | Nylon Patch | Fully Threaded | Alloy Steel Thermal Black Oxide (200 / Pkg.)

1/4-20 X 3/8" Socket Cap Screws | Hex Socket Drive | Nylon Patch | Fully - Main image
$33.46 $55.76 In stock

These 1/4-20 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: 1/4-20
  • 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: 1/4-20
  • Length: 3/8"
  • Threads per inch: 20
  • Measurement type: Inch
  • Pack quantity: 200 per package
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Standard Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

Express Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

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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)

Ava ★★★★★

The hex socket drive bit into my driver cleanly, and the thermal black oxide finish looks uniform across all 200 pieces. Threading them into my jig fixtures was smooth without any cross-threading fuss. These are exactly what I needed for precision assembly work.

Hazel ★★★★★

The nylon patch on these screws holds fast even under vibration, which saved me from having to use threadlocker on a tooling fixture. The black oxide finish looks clean and hasn't flaked during installation.

Eva ★★★★★

Just finished a small jig build and these 1/4-20s threaded in perfectly with no binding—the nylon patch held them snug without needing lock washers. The hex socket drive made it easy to get them seated in tight spots.