M10-1.5 X 180mm 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 (25 顆/包)

Installed these in a tooling fixture and the black oxide finish held up perfectly under assembly torque. The partial threading gave just the right grip depth without bottoming out, and the 12.9 alloy steel feels noticeably stiffer than standard bolts I've used before.

Used these to secure a new lifting jig on a press brake, and the 180mm length gave me just enough thread engagement. The black oxide finish slid into the tapped holes cleaner than I expected.

Was surprised how tight the threads cut on these black oxide screws when I threaded them into a hardened jig plate. They seated perfectly with no wobble, and the 180mm length gave me exactly the reach I needed for a deep assembly.