1/2-13 x 2-1/2" 소켓 캡 나사 | 육각 소켓 드라이브 | 나일론 패치 | 부분 나사산 | 합금강 열처리 블랙 옥사이드 (50개/팩)

The nylon patch on these screws is a lifesaver—they held fast on my milling fixture through a full day of vibration without a single one backing out. The black oxide finish looks sharp and the hex socket drive made torquing them down in tight spots a breeze.

Needed a reliable fastener for a tooling fixture, and the nylon patch on these is a real time-saver since it holds them in place without needing a separate lock washer. The black oxide finish feels solid and the hex socket drives cleanly with an Allen key. Easily worth the money for a fifty-pack.

I used these to mount a heavy jig on my mill table, and the nylon patch holds tight under vibration. The black oxide finish looks good and seems to resist surface rust better than plain steel. Would have given five stars if they were fully threaded for more grip options.