5/8-11 X 4" 內六角螺絲 | 圓頭內六角驅動 | 全牙 | 合金鋼熱處理黑氧化物 (10個/包)

Installed these on a drill press jig and the black oxide finish gave them a clean look while resisting oil stains from the shop. The threads cut smoothly into the predrilled holes without any binding.

The hex drive on these 5/8-11 x 4" screws gripped my hex key perfectly without any cam-out, which was a relief for the jig I was building. The black oxide finish is consistently dark and uniform across all ten pieces in the package.

The black oxide finish on these screws isn't just for looks—it handled my wrench without a single slip, and the full threading made seating them in my fixture a breeze. They’re solidly made and exactly the length I needed for a heavy tooling jig.