Mutual Screw & Supply

HOLO-KROME 73145 1/2-20 X 3-1/2" Socket Cap Screws | Hex Socket Drive | Alloy Steel Thermal Black Oxide (25 / Pkg.)

HOLO-KROME 73145 1/2-20 X 3-1/2" Socket Cap Screws | Hex Socket Drive | Alloy - Main image
$46.66 $63.92 In stock

These 1/2-20 x 3-1/2" 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: 1/2-20
  • Length: 3-1/2"
  • 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: 1/2-20
  • Length: 3-1/2"
  • Threads per inch: 20
  • Measurement type: Inch
  • Pack quantity: 25 per package
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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)

Christopher ★★★★★

Used these to secure a heavy steel fixture on a custom tooling frame, and the black oxide finish held up perfectly under repeated tightening. The hexagonal socket drive gave a solid grip without any cam-out issues, which saved me a lot of frustration. Exactly what I needed for precise assembly work.

Penelope U. ★★★★★

I was building a jig for a repeat drilling operation and the black oxide finish on these screws gave them just enough grip to hold torque without galling the threads. The socket drive bit fit snugly right out of the box, no wobble.

Ella M. ★★★★★

These cap screws seated perfectly in a jig I'm building for a production run, and the hex drive bit fit snugly without any wobble. The alloy steel feels dense and well-machined, and all 25 pieces had clean threads right out of the package.