1-3/8-6 x 18" 소켓 캡 나사 | 육각 소켓 드라이브 | 부분 나사산 | 합금강 열처리 블랙 옥사이드

The black oxide finish on these screws gives them a clean, uniform look that made them easy to tell apart from my older hardware. The 18-inch length and partial threading worked perfectly for aligning my jig setup, and the hex socket drive gripped firmly without any stripping.

Installed these on a heavy-duty press jig and the hex socket drive made tightening them a breeze, even in tight spots. The black oxide finish seems tough and hasn't shown any wear after a few weeks of use.

I needed extra-long screws for a custom jig setup, and these 18-inch socket caps fit perfectly in my drill press table. The hex drive made tightening them into tight spots much easier than with a standard bolt.