براغي رأس أسطواني M3-0.5 × 6mm | محرك سداسي داخلي | كامل الخيوط | فئة 12.9 من سبائك الصلب مؤكسد أسود حراري (800/عبوة)

The black oxide finish on these M3 screws gives them a nice, uniform look for hobby jig work. Threading went smooth into pre-tapped holes, and the 12.9 alloy feels solid for the size.

I needed a batch of small, strong fasteners for a jig I’m building, and these 12.9 alloy steel screws feel far more durable than the usual stainless ones I’ve used. The black oxide coating seems evenly applied, and every screw in the pack threaded cleanly into my tapped holes without any binding.

The hex socket drive seats perfectly without any stripping, and the black oxide finish gives them a nice, uniform look on my precision assembly jig.