براغي ذات رأس أسطواني M6-1 × 45 مم | محرك سداسي | ملولبة جزئياً | فولاذ سبائك فئة 12.9 أكسيد أسود حراري (400 / عبوة)

The black oxide finish on these M6 screws held up perfectly during my jig setup—no chips or wear after multiple tightenings. The hex socket drive made installation straightforward even in tight spaces. Exactly what I needed for precision assemblies.

Used these for a robotic arm assembly in a small shop, and the Class 12.9 hardness really held up under heavy torque without stripping. The black oxide finish on the threads made alignment a breeze during installation.

These went straight into a jig I'm building and the 12.9 alloy steel feels seriously tough for the price. The black oxide finish has a nice, even look and they thread in clean without any grit. A solid 400 pack means I won't be running out for a while.