3/8-24 x 5-1/4" 소켓 캡 나사 | 육각 소켓 드라이브 | 부분 스레드 | 합금강 열처리 블랙 옥사이드 (50개/팩)

I needed deep socket head bolts for a heavy jig, and these partially threaded ones match the spec exactly. Threading into the tapped holes was smooth, and the thermal black oxide coating looks clean and durable.

The black oxide finish on these is exactly what I look for in jig hardware—it resists the occasional coolant splash without any surface rust. Threads were clean and the hex sockets drove smoothly into my fixture blocks on the first try.

I needed a batch of partially threaded screws for a jig I’m building, and these 3/8-24 x 5-1/4" socket caps fit perfectly—the hex socket drive made tightening them in tight spots a breeze. The alloy steel feels solid, and the black oxide finish seems durable so far.