براغي ذات رأس تجويفي M16-2 × 60 مم | رأس زر محرك تجويف سداسي | ملولبة بالكامل | فئة 12.9 فولاذ سبائكي أكسيد أسود حراري (25 قطعة/عبوة)

The black oxide finish on these screws really holds up well in my jig setup, no chipping after repeated use. The hex socket drive gave me a solid bite with my Allen key, so they torqued down smoothly without stripping. Exactly what I needed for this precision tooling job.

These M16 bolts tightened down evenly with no binding, and the hex drive didn't strip under moderate torque. The black oxide finish wiped clean easily and looks consistent across all 25 pieces.

My existing jig for heavy steel plates was getting sloppy, but these M16-2 screws tightened down with zero play thanks to the hex socket drive and full threading. The black oxide finish also seems to resist oil and grime better than the plain steel ones I had before.