براغي رأس أسطوانية M16-2 × 40 مم | رأس زرية بمحرك سداسي | ملولبة بالكامل | فولاذ سبائكي فئة 12.9 بأكسيد أسود حراري (50 / عبوة)

These bolts hold firm on my milling jig with no wobble at all. The hex socket drive makes installation easy even in tight spots, and the black oxide finish seems to resist oil staining so far.

The black oxide finish on these M16 screws held up perfectly in my press tooling setup—no galling after repeated tightening. For a hardened 12.9-grade cap screw at this price, the hex drive engagement feels solid and precise.

The black oxide finish on these screws looks clean and professional, and the hex socket drive made installation a breeze with my torque wrench. I used them to secure a heavy jig on my milling machine, and the 12.9 grade steel feels incredibly solid under load.