Mutual Screw & Supply

HOLO-KROME 77504 3/8-24 X 4" Socket Cap Screws | Hex Socket Drive | Alloy Steel Thermal Black Oxide (50 / Pkg.)

HOLO-KROME 77504 3/8-24 X 4" Socket Cap Screws | Hex Socket Drive | Alloy Steel - Main image
$73.09 $98.77 In stock

These 3/8-24 x 4" socket cap screws are manufactured from Alloy Steel Thermal Black Oxide, featuring a socket drive. They are well suited to machinery, tooling, jigs, and precision assemblies.

  • Material and finish: Alloy Steel Thermal Black Oxide
  • Drive: Socket Drive
  • Thread size: 3/8-24
  • Length: 4"
  • Applications: Machinery, tooling, jigs, and precision assemblies

Specifications

  • Product type: Socket Cap Screws
  • Material: Alloy Steel
  • Finish: Thermal Black Oxide
  • Drive type: Socket Drive
  • Thread size: 3/8-24
  • Length: 4"
  • Threads per inch: 24
  • Measurement type: Inch
  • Pack quantity: 50 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)

Edward ★★★★★

I put these in a drilling jig fixture and the black oxide finish held up perfectly against the cutting fluid. The 3/8-24 thread engagement felt precise all the way down.

Hannah R. ★★★★★

The black oxide finish cleaned up nicely with just a rag, and these threads started by hand without any binding. I'm using them for a jig setup and the extra length is exactly what I needed.

Samuel ★★★★★

I needed some longer bolts for a custom jig I was building, and the black oxide finish on these matches my other tooling nicely. The hex socket drive made installation a breeze with my Allen wrench, even in tight spots.