HOLO-KROME 76192 M6-1 x 45mm 內六角螺絲 | 六角驅動 | 合金鋼 熱處理黑色氧化 (100顆/包)

Finally found these exact M6-1 x 45mm screws locally, and the thermal black oxide finish is holding up great against my workshop oils. They thread smoothly into my jig holes without binding.

The black oxide finish on these M6 cap screws looks clean and even, and all 100 in the bag have crisp, functional hex sockets—no duds or stripped threads. They’ve held up well in a tooling fixture I’ve been testing for the past few weeks.

The black oxide finish makes them look sharp in my jigs, and threading them into blind holes was effortless with the hex drive. I’ve used a few dozen already on a machine fixture and none have stripped or bent under torque.