M27-3 x 180mm 소켓 캡 나사 | 육각 소켓 드라이브 | 부분 나사산 | 클래스 12.9 합금강 열처리 블랙 옥사이드 (5개/팩)

The hex socket drive seated the Allen key perfectly, no wobble or stripped edges even under full torque. The black oxide finish has a consistent, matte look that fits right in with my tooling setup, and the 12.9 grade gives me confidence these won't shear on the press.

Used these 180mm screws for a heavy jig build—the hex socket drive made tightening them in tight spots much easier than I expected. Thread engagement felt solid and precise right out of the box. Definitely glad I went with the 12.9 alloy steel for this job.

The thermal black oxide finish on these screws held up perfectly during assembly—no chipping or galling at all. I used them for a custom jig setup, and the hex socket drive made tightening much easier than a standard hex head.