Mutual Screw & Supply

1-8 X 3-1/4" Socket Cap Screws | Hex Socket Drive | USA Made | Alloy Steel Thermal Black Oxide (30 / Pkg.)

1-8 X 3-1/4" Socket Cap Screws | Hex Socket Drive | USA Made | Alloy Steel - Main image
$316.63 $510.69 In stock

These 1-8 x 3-1/4" 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 size: 1-8
  • Length: 3-1/4"
  • 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 size: 1-8
  • Length: 3-1/4"
  • Threads per inch: 8
  • Measurement type: Inch
  • Pack quantity: 30 per package
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Express Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

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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)

Ellie ★★★★★

I grabbed these for a jig I'm building, and the black oxide finish handles machine oil and handling without smudging. The hex drive seated perfectly in my Allen keys, no stripping at all.

Julian C. ★★★★★

I’ve been using these to secure a jig on my milling table, and the hex drive made installation effortless. The black oxide finish looks clean and seems resistant to rust so far.

William L. ★★★★★

These 1-8 x 3-1/4" screws fit perfectly into my milling machine's jig setup. The black oxide coating looks durable and the hex drive makes installation straightforward.