Mutual Screw & Supply

HOLO-KROME 86172 #4-40 X 7/8" Socket Cap Screws | Hex Socket Drive | Alloy Steel Thermal Black Oxide (100 / Pkg.)

HOLO-KROME 86172 #4-40 X 7/8" Socket Cap Screws | Hex Socket Drive | Alloy - Main image
$23.37 $32.91 In stock

These #4-40 x 7/8" 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: #4-40
  • Length: 7/8"
  • 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: #4-40
  • Length: 7/8"
  • Threads per inch: 40
  • Measurement type: Inch
  • Pack quantity: 100 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 (4.6 / 5 · 5 reviews)

Eli ★★★★★

I use these for small jigs and fixtures, and the black oxide finish has held up well without any rust. The hex socket drive makes them easy to tighten in tight spots compared to slotted screws.

Aurora ★★★★★

These #4-40 screws fit perfectly into a new jig I'm building, and the black oxide coating seems like it'll resist rust well. The hex drive made installation quick without stripping the head.

Harper ★★★★★

Exactly what I needed for a small jig I was building — the black oxide finish on these #4-40 screws looks clean and the hex drive makes installation quick. They're definitely sturdy enough for precision assemblies, and the 100-count pack should last me a while.