M12-1.75 X 40mm 內六角螺絲 | 平頭內六角驅動 | 全牙 | 等級10.9 合金鋼 熱處理黑色氧化 (100 / 包)

The hex socket drive sits flush so my fixture plates close up tight without snagging, and the black oxide finish feels properly oiled right out of the bag. Drilled and tapped a few test holes, torqued them to spec, and the threads ran smooth the whole way. For a hundred pieces at this price, they're

The black oxide finish on these screws looks great and seems really durable for jig work. I used them on a recent tooling fixture and the hex socket drive seated perfectly without stripping. They're fully threaded, which gave me exactly the grip length I needed for this M12 application.

The hex socket drive seated my Allen wrench perfectly with no wobble, and the fully threaded length gave me solid clamping force on my jig build. Only gripe is the thermal black oxide scuffs a little too easily if you're not careful with the tool.