M12-1.75 X 20mm 소켓 캡 나사 | 버튼 헤드 육각 소켓 드라이브 | 전체 나사산 | 클래스 12.9 합금강 열처리 블랙 옥사이드 (100개/팩)

Finally got these to finish a tooling fixture rebuild, and the 12.9 grade alloy steel really feels solid under torque. The black oxide coating looks consistent across all 100 pieces, no burrs on the threads.

I was replacing some worn jig hardware and these M12 button heads fit perfectly, the hex drive seated without any cam-out. The thermal black oxide seems consistent across all 100 screws, which is nice for a uniform look in the assembly.

The black oxide finish looks sharp in a fixture, and the hex socket drive gripped cleanly without stripping. Threads ran smooth into a tapped M12 hole, though the 20mm length is shorter than it looks in photos—measure twice if you're not sure.