M16-1.5 X 55mm 소켓 캡 나사 | 육각 소켓 드라이브 | 전체 나사산 | 클래스 12.9 합금강 열처리 블랙 옥사이드 (25개/팩)

Used a full pack mounting a heavy-duty fixture to a steel table and every bolt threaded cleanly without binding. The 12.9 grade gives me real confidence in the clamping force for high-stress tooling setups.

The black oxide finish on these gives them a proper industrial look, and the hex socket drive seated perfectly with my torque wrench—no rounding on the first few uses. Threads cut cleanly into my jig plate and held firm at 55mm length. Solid set for the price.

I needed a bolt that wouldn't strip under high torque for a tooling fixture, and these M16s with the hex socket drive held up perfectly. The black oxide finish looks clean and seems to resist oil and grime well in the shop.