3/8-16 x 5-3/4 英吋 內六角螺絲 | 六角驅動 | 部分螺紋 | 合金鋼 熱處理黑色氧化 (50 顆/包)

Installed these on a jig I'm building for work, and the alloy steel feels much tougher than the cheap zinc ones I used before. The thermal black oxide finish hasn't chipped or scratched during tightening either.

The partially threaded length is exactly what I needed for a jig build, and the hex socket drive made tightening them in tight spots a breeze. They seated firmly without any stripping, and the thermal black oxide looks clean and consistent across all 50 pieces.

The black oxide finish on these screws is exactly what I needed for a tooling fixture that sees constant handling—no glare, no rust after a week of assembly work. The partial threading gives you that extra grip where it counts, and the hex socket drive makes them a breeze to torque down in tight spo