Mutual Screw & Supply

M3-0.5 X 40mm Socket Cap Screws | Button Head Hex Socket Drive | Fully Threaded | Class 12.9 Alloy Steel Thermal Black Oxide (200 / Pkg.)

M3-0.5 X 40mm Socket Cap Screws | Button Head Hex Socket Drive | Fully Threaded - Main image
$30.44 $44.76 In stock

These M3-0.5 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: Button Head
  • Drive: Hex Socket Drive
  • Thread style: Fully Threaded
  • Thread size: M3-0.5
  • Length: 40mm
  • Applications: Machinery, tooling, jigs, and precision assemblies

Specifications

  • Product type: Socket Cap Screws
  • Head style: Button Head
  • Material: Alloy Steel
  • Finish: Thermal Black Oxide
  • Grade: Class 12.9
  • Drive type: Hex Socket Drive
  • Thread style: Fully Threaded
  • Thread size: M3-0.5
  • Length: 40mm
  • Measurement type: Metric
  • Pack quantity: 200 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 (4.6 / 5 · 5 reviews)

Victoria ★★★★★

Was pleasantly surprised at how consistent the threading is across all 200 screws—every single one threaded smoothly into my aluminum jig without binding. The black oxide finish looks good and seems like it’ll hold up to shop use.

Sebastian ★★★★★

Installed these in a 3D printer carriage assembly and the black oxide finish gives them a nice, uniform look. The 12.9 alloy steel feels extremely strong compared to standard stainless, no stripping so far.

Joseph ★★★★★

Finally found some M3 screws in 40mm length that actually thread smoothly into tight holes without binding. The 12.9 alloy steel feels properly tough for clamping down jig components.