M22-2.5 X 75mm 內六角螺絲 | 內六角驅動 | 全牙 | 12.9級 合金鋼 熱處理黑色氧化 (10 顆/包)

Installed these in a heavy jig I’m building and the black oxide finish held up well against minor scuffs during assembly. The 12.9 grade steel gives me confidence they won’t strip under load. Only wish they came in a slightly larger pack.

The threads are perfectly cut and the hex socket engages cleanly without any slop — these went into my jig fixture and held alignment through a full day of drilling. For 12.9 alloy steel at this price, they’re a solid buy.

The black oxide finish on these M22 screws held up perfectly in my jig setup, no galling even under heavy clamping torque. They threaded cleanly into the tapped holes without binding on the first pass.