Mutual Screw & Supply

1-1/4-7 X 3-1/2" Socket Cap Screws | Flat Head Hex Socket Drive | Fully Threaded | Alloy Steel Thermal Black Oxide

1-1/4-7 X 3-1/2" Socket Cap Screws | Flat Head Hex Socket Drive | Fully - Main image
$27.54 $45.15 In stock

These 11/4-7 x 3-1/2" 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
  • Head style: Flat Head
  • Drive: Hex Socket Drive
  • Thread style: Fully Threaded
  • Thread size: 11/4-7
  • Length: 3-1/2"
  • Applications: Machinery, tooling, jigs, and precision assemblies

Specifications

  • Product type: Socket Cap Screws
  • Head style: Flat Head
  • Material: Alloy Steel
  • Finish: Thermal Black Oxide
  • Drive type: Hex Socket Drive
  • Thread style: Fully Threaded
  • Thread size: 11/4-7
  • Length: 3-1/2"
  • Threads per inch: 7
  • Measurement type: Inch
  • Pack quantity: 1 per package
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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)

Abigail X. ★★★★★

Used a dozen of these to rework a jig I've had for years—the black oxide finish left zero residue on my fingers, which was a nice surprise for a thermal-treated screw. Threads cut cleanly into the alloy steel frame without any binding, and the flat head sits flush enough that my calipers didn't snag

David J. ★★★★★

The black oxide finish on these screws is holding up perfectly on my milling machine jig, no rust after three weeks. Tightened them down with a hex key and the fit was snug, exactly what I needed for the tooling setup.

Jason C. ★★★★★

Installing these on a jig I'm building and the hex socket drive gives a really solid grip, no stripping at all. The black oxide finish seems durable and the threads are clean all the way down. Exactly what I needed for heavy-duty tooling work.