Mutual Screw & Supply

HOLO-KROME 72348 7/8-9 X 3-1/4" Socket Cap Screws | Hex Socket Drive | Alloy Steel Thermal Black Oxide (10 / Pkg.)

HOLO-KROME 72348 7/8-9 X 3-1/4" Socket Cap Screws | Hex Socket Drive | Alloy - Main image
$66.52 $89.89 In stock

These 7/8-9 x 3-1/4" 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: 7/8-9
  • Length: 3-1/4"
  • 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: 7/8-9
  • Length: 3-1/4"
  • Threads per inch: 9
  • Measurement type: Inch
  • Pack quantity: 10 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 (5.0 / 5 · 5 reviews)

Sophia F. ★★★★★

The black oxide finish on these screws handled a greasy jig build without any rust spots appearing. They threaded smoothly into tapped holes on my mill table with no binding.

Jacob ★★★★★

I needed some longer socket cap screws for a custom jig I’m building, and these 7/8-9 x 3-1/4" ones fit perfectly. The hex socket drive made them easy to tighten even in a tight spot.

Isabella ★★★★★

The black oxide finish looks great on my machinery repair bench and hasn't chipped during install with a hex wrench. These 7/8-9 screws threaded in cleanly over the full 3-1/4" length without any binding—solid purchase for the price of a ten-pack.