Mutual Screw & Supply

HOLO-KROME 72180 3/8-16 X 4" Socket Cap Screws | Hex Socket Drive | Alloy Steel Thermal Black Oxide (50 / Pkg.)

HOLO-KROME 72180 3/8-16 X 4" Socket Cap Screws | Hex Socket Drive | Alloy Steel - Main image
$53.85 $86.85 In stock

These 3/8-16 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: 3/8-16
  • 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: 3/8-16
  • Length: 4"
  • Threads per inch: 16
  • Measurement type: Inch
  • Pack quantity: 50 per package
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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)

Lucy ★★★★★

The black oxide finish on these screws gives them a nice, uniform look and seems like it will hold up well against rust in my shop. They threaded cleanly into my fixture plate without any binding or wobble, which is always a relief. Exactly what I needed for jig assembly work.

Claire E. ★★★★★

I needed some high-strength bolts for a jig I was building, and these 3/8-16 x 4" cap screws came in a handy 50-pack. The hex socket drive made installation a breeze with my allen wrench, no slippage at all. They're solid alloy steel with that thermal black oxide, exactly what I expected for tooling

Grace Y. ★★★★★

The black oxide finish held up perfectly during assembly, no galling at all. Each screw threaded smoothly into tapped holes without binding, which saved me a ton of time on my latest fixture.