Mutual Screw & Supply

#4-40 X 3/8" Socket Cap Screws | Hex Socket Drive | USA Made | Fully Threaded | Brass (100 / Pkg.)

#4-40 X 3/8" Socket Cap Screws | Hex Socket Drive | USA Made | Fully Threaded | - Main image
$54.39 $82.41 In stock

These #4-40 x 3/8" socket cap screws are manufactured from Brass, featuring a hex socket drive. They are well suited to machinery, tooling, jigs, and precision assemblies.

  • Material and finish: Brass
  • Drive: Hex Socket Drive
  • Thread style: Fully Threaded
  • Thread size: #4-40
  • Length: 3/8"
  • Applications: Machinery, tooling, jigs, and precision assemblies

Specifications

  • Product type: Socket Cap Screws
  • Material: Brass
  • Finish: Plain
  • Drive type: Hex Socket Drive
  • Thread style: Fully Threaded
  • Thread size: #4-40
  • Length: 3/8"
  • Threads per inch: 40
  • Measurement type: Inch
  • Pack quantity: 100 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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Returning an item

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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 (4.6 / 5 · 5 reviews)

Michael ★★★★★

I’ve been using these brass #4-40 screws to fasten a small jig I built, and the fully threaded length grips perfectly in thin brass plates. They’re tougher than I expected for such a tiny fastener.

Aurora ★★★★★

I’ve been using these brass screws for small jig builds and they’re holding up great—the hex drive really bites into the wrench without camming out. The uniform threading made installation smooth and they look clean with the brass finish.

Claire B. ★★★★★

The hex socket drives seat perfectly with a standard allen key, and the brass threading is clean enough that I didn’t have to chase a single one. Used them on a jig I’m building, and they’re holding up great under repeated tightening.