براغي رأس كبس M30-3.5 × 55 مم | محرك سداسي | ملولبة بالكامل | فئة 12.9 من سبائك الفولاذ بأكسيد أسود حراري (3/عبوة)

Installed these on a jig I’ve been building and the black oxide finish gives them a nice, uniform look that resists fingerprints well. The 55mm length was exactly what I needed for a thick steel bracket.

I was a bit skeptical about the price for just three screws, but the 12.9 alloy steel feels incredibly tough and the black oxide finish looks really clean on my jig. They fit snugly without any wobble during assembly.

These hefty bolts threaded in perfectly on my jig setup, and the black oxide finish looks clean on the assembly. The hex socket drive held up well under my torque wrench without any stripping. Exactly what I needed for this tooling project.