M3-0.5 x 30mm 소켓 캡 나사 | 육각 소켓 드라이브 | 부분 나사산 | 12.9급 합금강 열처리 블랙 옥사이드 (400개/팩)

I was pleasantly surprised by the machining precision on these M3 socket screws—the hex socket drive engages perfectly every time. The black oxide finish seems durable, and the 30mm length worked great for securing a jig on my CNC router table.

Finally got my tooling project dialed in with these M3 socket cap screws. The hex socket drive grabbed perfectly with my standard driver, and the 30mm length gave me just the right bite into the metal jig plate.

Packed these into a jig I’m building, and the 12.9 alloy steel feels noticeably tougher than the standard 10.9 grade I used before. The thermal black oxide finish gives them a nice grip in the hex driver without any slipping. Exactly what I needed for a tight M3 thread.