1/4-28 X 3" 內六角螺絲 | 圓頭內六角驅動 | 全螺紋 | 合金鋼熱處理黑氧化 (100 個/包)

Installed these in a custom jig and the hex socket drive held up perfectly to repeated torquing with no stripping. The entire batch looks uniformly black-oxided, which is a nice touch for a non-decorative fastener.

The hex drive on these screws fits perfectly with my standard Allen wrench—no slippage at all. The black oxide finish looks professional on the jig I built, and the threads cut cleanly into the steel plate. Exactly what I needed for a precision assembly project.

I’d been hunting for fasteners that could hold up in my fixture jig, and the black oxide coating on these is perfect for both corrosion resistance and tool life. The hex socket drive makes installation with a standard Allen wrench a breeze, so I’ll definitely be using them for future precision assem