M12-1.75 X 45mm 內六角螺絲 | 六角驅動 | 全牙 | 12.9級合金鋼熱處理黑氧化 (100顆/包)

The black oxide finish on these screws is perfect for my tooling setup—no glare and they fit snugly into the jig holes. Threads were clean with no burrs right out of the package.

Needed exactly 45mm for a jig I’m building, and these threaded perfectly into the tapped hole without binding. The black oxide finish gives them a nice, uniform look that should hold up well in my workshop.

The black oxide finish on these is tough as nails, and the hex socket drive seated perfectly with my torque wrench. I've got them holding a precision assembly together and the class 12.9 hardness gives me serious peace of mind.