براغي رأس أسطوانية M2-0.4 X 8mm | رأس زرية محرك سداسي داخلي | سنون كاملة | فولاذ سبائكي فئة 12.9 أكسيد أسود حراري (400/عبوة)

I needed a bulk pack for assembling small jigs, and the Class 12.9 alloy steel feels incredibly tough for such tiny screws. The black oxide finish held up well against my fingers during installation.

The hex socket drive on these M2 screws grips the driver perfectly without any stripping, and the black oxide finish looks very clean on my 3D printer carriage. I've already used about half the bag for jig assemblies, and every single one threaded smoothly into tapped holes.

Was a bit skeptical about the black oxide finish holding up, but after using a dozen of these in a jig build, they threaded cleanly and the coating hasn't chipped at all. The hex socket drive gives a solid grip without stripping.