براغي رأس أسطوانية M4-0.7 X 10mm | محرك سداسي | كاملة الخيوط | فولاذ سبائكي فئة 12.9 أكسيد أسود حراري (900 / عبوة)

I needed a bulk pack for a jig I'm building, and the 12.9 alloy steel feels much tougher than the standard stainless I've used before. The black oxide finish went on smoothly without any residue gumming up the threads.

I was pleasantly surprised by the hardened finish on these little screws—they went into my aluminum jig plate without stripping. The black oxide coating gives them a nice, uniform look that matches my fixture perfectly.

Put these to work on a small jig I’m building, and the hex drive engages nicely even with a cheap Allen key. The black oxide finish seems consistent across all 900 pieces. Only wish the packs were labeled a bit clearer so I didn’t have to count to confirm the size.