براغي رأس أسطوانية M20-2.5 × 180 مم | محرك سداسي | خيط جزئي | فولاذ سبائكي فئة 12.9 أسود حراري (10 / عبوة)

The hex socket drive on these M20 screws gripped perfectly without any cam-out, which was a relief. The thermal black oxide finish looked clean and professional on my tooling setup.

Used these on a heavy jig I was building and the partial threading made alignment much easier than full-thread bolts would have. The black oxide finish is holding up well against shop grime so far.

I needed high-strength fasteners for a jig I’m building, and the black oxide finish on these screws gives a nice, non-reflective surface that resists corrosion. The hex socket drive made installation effortless with my Allen key, and the 12.9 alloy steel feels incredibly rigid.