M16-1.5 X 25mm براغي رأس تجويف سداسي | محرك سداسي تجويف | كامل الخيط | فئة 12.9 فولاذ سبائكي أكسيد أسود حراري (50 / عبوة)

Used a couple of these to mount a heavy steel jig in my press, and the black oxide finish held up nicely against the grease and grime. The hex socket drive made tightening them in a tight spot way easier than a standard hex head would have.

These screws handled the torque perfectly when I was tightening down a set of heavy-duty jig fixtures. The black oxide finish seems robust and didn't flake at all during assembly. Exactly the quality I was hoping for in a Class 12.9 fastener.

For a precision assembly I was building at the shop, these M16 socket caps seated perfectly and the black oxide finish feels properly durable. The hex drive engaged firmly without any stripping, which is exactly what I need when torquing in tight spots.