M4-0.7 X 6mm 소켓 캡 나사 | 버튼 머리 육각 소켓 드라이브 | 전체 나사산 | 10.9급 합금강 열처리 흑색 산화 (1200개/팩)

The black oxide finish on these M4 screws cleaned up beautifully with just a rag before assembly, no oil residue at all. I’ve used them on a small fixture and the hex drive seated perfectly every time, even in tight spots. Exactly what I needed for precision work.

I needed a bunch for a jig I was building, and the black oxide finish held up perfectly without any flaking during assembly. The hex socket drive gripped well even at higher torque, and the 1200-pack means I won't be reordering anytime soon.

Got these for my jig builds and they're impressively consistent — every single one in the bag threads clean without any burs or binding. The black oxide finish feels solid and they've held up through repeated tightening without stripping.