براغي رأس مقبس M10-1.5 × 115 مم | محرك مقبس سداسي | خيط جزئي | فولاذ سبائكي فئة 12.9 أكسيد أسود حراري (50 / عبوة)

Needed 50 of these for a jig assembly and the class 12.9 hardness gave me zero worry about stripping during torque. The partial threading seated cleanly through a 10mm plate, and they came out of the bag evenly coated without any of that flaky black residue I've seen on cheaper screws.

The black oxide finish on these screws holds up nicely in my fixture table, no rust after a few weeks of oil exposure. I was a little worried about the partial thread for clamping, but it works perfectly with my tooling setup.

These bolts threaded into my jig perfectly, no wobble. The thermal black oxide finish seems like it will hold up better than plain steel against chips and coolant. Exactly the strength I needed for a heavy-duty press fixture.