M16-2 X 50mm 소켓 캡 나사 | 접시머리 육각 소켓 드라이브 | 풀 스레드 | Class 10.9 합금강 열처리 블랙옥사이드 (50개/팩)

I’ve been using these in a custom fixture build and the hex socket drive seats perfectly with my Allen key—no stripping even under torque. The 10.9 alloy steel feels sturdy, and the thermal black oxide gives them a clean, uniform look that resists fingerprints.

The black oxide finish on these screws resisted scratching when I tightened them with my hex key, which surprised me. They threaded smoothly into my steel fixture without any binding. Exactly the strength I needed for heavy-duty tooling.

Got my jig assembly back together with these and the hex socket drive took torque really well, no stripping at the head. The fully threaded shaft seated flush like I needed for the fixture plate, and the black oxide coating looks even and clean out of the pack.