براغي رأس أسطوانية M36-4 × 100 مم | محرك سداسي داخلي | سنون كاملة | فولاذ سبائكي فئة 12.9 مؤكسد أسود حراريًا (2 / عبوة)

Needed heavy-duty screws for a large jig fixture, and the 12.9 grade alloy steel handled the torque without any sign of stripping. The black oxide coating looks clean and professional.

Used these for mounting a heavy jig plate on our press brake – the 12.9 alloy steel held torque beautifully without any deformation. The thermal black oxide finish also seems to resist shop grime better than plain steel.

The hex socket drive engaged perfectly with my torque wrench, and the black oxide finish looks like it will hold up well on the tooling fixture I'm building. These fasteners feel heavier and more precise than the standard hardware I've used before.