M12-1.75×35mm 소켓 캡 나사 | 육각 소켓 드라이브 | 풀 나사산 | 클래스 12.9 합금강 아연 도금 (50개/팩)

The zinc plating looks clean and even across all 50 pieces, and the hex socket drive sat snug on my Allen key with zero wobble. Class 12.9 hardness gives me confidence these won't strip out in my tooling fixtures.

Threaded these into a jig for a repeat drilling fixture, and the Class 12.9 steel feels noticeably harder than the typical hardware-store bolts. Every one of the 50 seated clean and flush, with no burrs on the threads or socket.

Got a full box of 50 and every single one threaded clean into my jig plate with no binding. The zinc coating looks uniform and the hex socket grips perfectly without stripping.