Mutual Screw & Supply

1-3/8-6 X 3" Socket Cap Screws | Hex Socket Drive | Fully Threaded | Alloy Steel Thermal Black Oxide

1-3/8-6 X 3" Socket Cap Screws | Hex Socket Drive | Fully Threaded | Alloy - Main image
$40.65 $66.64 In stock

These 13/8-6 x 3" 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: 13/8-6
  • Length: 3"
  • 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: 13/8-6
  • Length: 3"
  • Threads per inch: 6
  • Measurement type: Inch
  • Pack quantity: 1 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)

Joseph E. ★★★★★

Installed a set of these on a homemade press fixture, and the black oxide finish looks clean while resisting oil well. The hex socket drive makes tightening in tight spots much easier than a standard hex head.

Elizabeth ★★★★★

I needed these for a jig I was building, and the hex socket drive made installation a breeze with no stripping. The 3-inch length gave me just the right grip depth in my assembly.

Mia C. ★★★★★

The black oxide finish on these screws makes them slide into my fixture's tapped holes with zero binding, and the hex drive bites perfectly even at high torque. They're holding up beautifully under daily use on my press jig.