براغي رأس مقبس M2-0.4 × 16 مم | محرك سداسي | كامل الخيوط | فولاذ سبائك فئة 12.9 أكسيد أسود حراري (600 / عبوة)

The black oxide finish looks proper on these, and the hex socket drive seated cleanly on my driver without stripping. I used them for a jig assembly and the 12.9 alloy steel feels reassuringly solid.

Needed a handful of these for a small robotics jig I’m building, and the black oxide finish gives them a nice, uniform look against the steel. The hex socket drive bites perfectly with a 1.5mm driver—no slipping even at high torque. Definitely rugged for their tiny size.

I was a little worried about the 12.9 alloy steel being too brittle for my jig, but these black oxide screws threaded in smoothly and held tight without any stripping. The 600-count pack will last me through several projects.