Mutual Screw & Supply

M4-0.7 X 40mm Socket Cap Screws | Flat Head Hex Socket Drive | Partially Threaded | Class 12.9 Alloy Steel Thermal Black Oxide (400 / Pkg.)

M4-0.7 X 40mm Socket Cap Screws | Flat Head Hex Socket Drive | Partially - Main image
$33.82 $51.24 In stock

These M4-0.7 x 40mm 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: Partially Threaded
  • Thread size: M4-0.7
  • Length: 40mm
  • Applications: Machinery, tooling, jigs, and precision assemblies

Specifications

  • Product type: Socket Cap Screws
  • Head style: Flat Head
  • Material: Alloy Steel
  • Finish: Thermal Black Oxide
  • Grade: Class 12.9
  • Drive type: Hex Socket Drive
  • Thread style: Partially Threaded
  • Thread size: M4-0.7
  • Length: 40mm
  • Measurement type: Metric
  • Pack quantity: 400 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)

Aurora Z. ★★★★★

Needed a batch of high-strength fasteners for a jig project and these M4s fit the bill perfectly. The flat head sits flush, and the 12.9 alloy steel feels noticeably tougher than standard hardware store screws.

Brian M. ★★★★★

For the price, getting 400 Class 12.9 alloy steel screws this precise is a steal. They threaded cleanly into my aluminum jig without any binding, and the hex drive held up perfectly under torque.

Ruby ★★★★★

The black oxide finish is exactly what I wanted for tooling—no glare under shop lights, and the partial threads grip cleanly without binding. For a 400-count box at this grade, these are a solid value for precision work.