M42-4.5 x 160mm 內六角圓柱頭螺絲 | 內六角驅動 | 半牙 | 12.9級合金鋼熱處理黑色氧化

The black oxide finish on these screws looks great and seems like it will hold up well in my shop jigs. The hex socket drive made installation straightforward with a standard Allen key, and the partial threading gives good grip. Exactly what I needed for a precise assembly project.

Used these for a heavy-duty jig setup in the shop, and the 160mm length gave just the right grip in thick steel. The partially threaded design made alignment a breeze during assembly.

The black oxide finish on these is flawless, and the threads are cut so cleanly they seated into my jig without any binding. For a 160mm screw this size, the class 12.9 hardness gives me real confidence in the tooling setup.