M10-1.25 X 90mm 內六角螺絲 | 六角驅動 | 部分螺紋 | 12.9級合金鋼熱處理黑色氧化 (50顆/包)

The black oxide finish on these screws looks uniform and professional, which is exactly what I wanted for a precision assembly jig. They drove in cleanly with a hex key and the partial threading gave me just the right grip for clamping.

Installed these on a milling fixture and the 12.9 alloy steel held up perfectly under heavy clamping torque—no stripping or yielding. The black oxide finish also feels more durable than expected for the price.

Used a few of these to repair a jig at work, and the 12.9 grade held up perfectly under heavy clamping force. The black oxide finish also seems durable enough to resist rust in a damp shop environment.