Mutual Screw & Supply

HOLO-KROME 720000290 #5-40 X 5/16" Socket Cap Screws | Hex Socket Drive | Alloy Steel Thermal Black Oxide (100 / Pkg.)

HOLO-KROME 720000290 #5-40 X 5/16" Socket Cap Screws | Hex Socket Drive | Alloy - Main image
$19.5 $31.97 In stock

These #5-40 x 5/16" 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: #5-40
  • Length: 5/16"
  • 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: #5-40
  • Length: 5/16"
  • Threads per inch: 40
  • Measurement type: Inch
  • Pack quantity: 100 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 (5.0 / 5 · 5 reviews)

John I. ★★★★★

The black oxide finish on these screws looks great and held up perfectly during assembly of a small precision fixture. They seated cleanly with a hex driver and the threads were crisp—no binding or galling at all. Exactly what I needed for this tooling job.

Carter ★★★★★

Used a full pack of these on a jig I'm building and not a single one stripped or rounded out, which is more than I can say for some cheaper hardware. The black oxide finish has a nice uniform look and the alloy steel feels properly heat-treated. For a hundred pieces at this price, they're the kind o

Riley ★★★★★

The drive sockets fit snugly on my hex key with zero wobble, and the black oxide finish looks even better up close on the machine jig I’m building. Threads started cleanly into the tapped holes, so no fighting or cross-threading on the first few pieces.