M5-0.8 x 40mm 소켓 캡 나사 | 육각 소켓 드라이브 | 풀 스레드 | 10.9급 합금강 열처리 블랙 옥사이드 (400개/팩)

The black oxide finish is evenly applied and the threads are clean all the way down—no burrs or binding when I ran them into tapped holes. I used about 80 of these for a fixture setup and every single one seated flush without issue. For the price per piece, these are hard to beat for any jig or prec

Threads are clean and uniform across all 400 pieces, which saved me a ton of time on a light fixture assembly where I needed exact lengths. The black oxide finish grips well without any galling when I’m torquing them down, and the hex drive seated perfectly on my driver. These are solidly built for

Installed these in a jig I’m building for a production run and the black oxide finish handled the oily shop environment without rusting. The hex socket drive bit fit snugly, no wobble at all.