M8-1.25 X 90mm 內六角螺絲 | 六角驅動 | 半牙 | 12.9級合金鋼 熱處理黑色氧化 (100/包)

I used these M8 socket cap screws to build a precision assembly fixture, and the thermal black oxide coating handled the shop oil and handling without any surface rust. The hex socket drive seated perfectly every time, and the 90mm length was just right for my 12mm plate jig setup.

Installing these in a jig for a custom tool build, and the 12.9 grade steel feels incredibly solid—way more durable than the standard stuff I've used. The black oxide finish also seems to hold up well without any immediate marring from the socket driver.

The threads on these M8 bolts are clean and cut smoothly, making them perfect for my jig setup. The 90mm length gave me just the right grip for a heavy-duty fixture, and the black oxide finish looks professional.