Mutual Screw & Supply

#4-40 X 5/8" Socket Cap Screws | Hex Socket Drive | Nylon Patch | Fully Threaded | Alloy Steel Thermal Black Oxide (300 / Pkg.)

#4-40 X 5/8" Socket Cap Screws | Hex Socket Drive | Nylon Patch | Fully - Main image
$30.49 $49.17 In stock

These #4-40 x 5/8" socket cap screws are manufactured from Alloy Steel Thermal Black Oxide, featuring a hex socket drive. They are well suited to machinery, tooling, jigs, and precision assemblies.

  • Material and finish: Alloy Steel Thermal Black Oxide
  • Drive: Hex Socket Drive
  • Thread style: Fully Threaded
  • Thread size: #4-40
  • Length: 5/8"
  • Applications: Machinery, tooling, jigs, and precision assemblies

Specifications

  • Product type: Socket Cap Screws
  • Material: Alloy Steel
  • Finish: Thermal Black Oxide
  • Drive type: Hex Socket Drive
  • Thread style: Fully Threaded
  • Thread size: #4-40
  • Length: 5/8"
  • Threads per inch: 40
  • Measurement type: Inch
  • Pack quantity: 300 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)

Violet ★★★★★

The black oxide finish on these looks sharp and holds up well in my tooling setup. The nylon patch keeps them snug without needing thread locker, and the 300-count box is a solid value for small precision assemblies.

Chloe ★★★★★

I’m building a fixture and these #4-40s came out of the box perfectly threaded, the black oxide finish looks great under the shop light. The 5/8" length fit my jig plate flush with the nylon patch gripping tight on the third re-tighten.

Lucy Y. ★★★★★

The nylon patch on these screws holds tight even after a few removals, which is perfect for my precision assembly work. They drive cleanly with a hex key and the black oxide finish looks great against the aluminum parts I’m using them on.