Mutual Screw & Supply

M5-0.8 X 55mm Socket Cap Screws | Flat Head Hex Socket Drive | Partially Threaded | Class 12.9 Alloy Steel Thermal Black Oxide (200 / Pkg.)

M5-0.8 X 55mm Socket Cap Screws | Flat Head Hex Socket Drive | Partially - Main image
$49.85 $69.24 In stock

These M5-0.8 x 55mm 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: M5-0.8
  • Length: 55mm
  • 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: M5-0.8
  • Length: 55mm
  • Measurement type: Metric
  • Pack quantity: 200 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)

Matthew R. ★★★★★

These flat heads sit flush without any wobble, and the black oxide finish looks professional on my tooling fixtures. The partial threading gave just the right grip depth for a 10mm plate I was mounting.

Stella ★★★★★

Needed a fresh batch for jig rebuilds, and these 12.9-grade screws take torque far better than the hardware-store alternatives. The black oxide finish held up perfectly against oil and minor chips during the first week of use.

Ava ★★★★★

I grabbed these for a precision fixture at work and the 12.9 grade held up perfectly under repeated clamping loads. The black oxide finish also seems to resist oil staining better than plain steel, which is a nice bonus.