M12-1.25 X 50mm 소켓 캡 나사 | 육각 소켓 드라이브 | 전체 나사산 | 클래스 12.9 합금강 열처리 블랙 옥사이드 (50개/팩)

The black oxide finish on these screws hasn’t chipped or scratched during assembly, which is a relief for tooling work. They threaded smoothly into pre-tapped holes without any binding, making my jig build much faster than expected.

I've been using these in my jig setup and the black oxide finish is holding up well against minor abrasion. The hex socket drive engages cleanly with my wrench, and the 12.9 grade steel gives me confidence in high-torque applications.

Installing these on a precision fixture — the threads cut clean and the black oxide finish seems durable. Fit perfectly in a jig for a production run and no galling.