M6-1 x 40mm 소켓 캡 나사 | 육각 소켓 드라이브 | 부분 나사산 | 클래스 12.9 합금강 아연 도금 (200개/팩)

The threading is clean and consistent across all 200, so they seat smoothly without any cross-threading hassle. For jig work and precision fixtures, the 12.9 alloy steel and partial thread hold up well under repeated torque. Only wish they came in a resealable bag, but that's a minor nitpick for the

Pulled these out of the pack and the zinc plating looks evenly done, no rough edges on the threads. The 12.9 alloy steel feels seriously rigid; I torqued one into a fixture and it held without any flex. A full box of 200 for this price is hard to argue with.

I needed 40mm length for a couple of jig builds and these threaded perfectly without binding. The zinc plating looks uniform and clean.