1-1/8-7 x 4" 內六角螺絲 | 六角驅動 | 部分螺紋 | 合金鋼熱處理黑色氧化 (2個/包)

Used these to secure a heavy jig on the drill press table, and the partial threading gave just the right grip depth. The black oxide finish feels tougher than standard zinc, and they haven't budged under vibration. Exactly the kind of hold I needed for precision work.

The partially threaded design on these made installation into my tooling block much easier than fully threaded bolts would have. The black oxide finish looks like it'll hold up well to shop use.

Needed some heavy-duty bolts for a jig I was rebuilding, and these 4-inch socket cap screws fit perfectly with their thermal black oxide finish. The hex drive seated securely without any stripping, even under decent torque.