براغي رأس مقبس سداسي M14-1.5 × 30 مم | محرك سداسي | كامل الخيوط | فولاد سبائكي فئة 12.9 مع أكسيد أسود حراري (50 / عبوة)

Installed a set of these on a jig fixture at work, and the Class 12.9 hardness is immediately noticeable compared to standard grade 8.8. No stripped hex sockets during installation, which is a relief.

The black oxide finish on these M14 socket cap screws looks clean and professional on my tooling fixture. They threaded smoothly into tapped holes with no binding, which I appreciated for a precise assembly.

Installing these into a jig for a new production run and the 12.9 alloy steel feels incredibly solid, no stripping risk even under heavy torque. The black oxide finish also seems like it'll resist a bit of shop grime better than plain steel.