M12-1.75 x 150mm 內六角螺絲 | 內六角驅動 | 部分螺紋 | 12.9 級合金鋼熱處理黑色氧化 (25/包)

Needed some heavy-duty bolts for a vise restoration, and these Class 12.9 alloy steel screws handled the torque perfectly without stripping. The black oxide finish already looks great against the cast iron.

The partial threading leaves plenty of grip for clamping thick flanges, and the hex socket drive seated perfectly with my torque wrench without stripping. These 12.9s feel rock solid for jig building, and the black oxide coating has a nice even look.

The black oxide finish on these M12s is a nice touch—they slide into tapped holes without any binding, and the hex socket drive grabs cleanly with standard Allen keys. The partial threading gives just enough grip for my fixture plates while leaving room for stack-ups. Pack of 25 is solid value for s