M5-0.8×18mm 소켓 캡 나사 | 플랫 헤드 육각 소켓 드라이브 | 풀 스레드 | 클래스 12.9 합금강 열처리 블랙 옥사이드 (600개/팩)

Used these for a jig build and the hex socket drive made tightening in tight spots much easier. The black oxide finish held up well against minor oil exposure. For the price per piece, you're getting a solid 12.9 grade screw.

Installed a batch into a new jig today and every single screw seated perfectly without any stripped threads. The hex socket drive gripped my Allen key solidly, even at higher torque. These 12.9 alloy steel screws feel far more rigid than the 8.8 grade I used before.

The black oxide finish looks sharp on my precision fixture, and the hex socket drive makes seating them in tight spots a breeze. All 600 pieces came sorted clean and thread-checked, so I didn't have to cull a single one for the assembly line.