M20-2.5 X 230mm 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 (5/包)

Had to swap out a stripped bolt on a heavy-duty press fixture, and these M20s handled the torque without flexing. The 12.9 alloy steel with black oxide looks solid and should resist rust well in the shop.

The black oxide finish looks sharp and the hex drive seated perfectly with my torque wrench—these M20s feel rock solid for jig building. Threads cut clean going into tapped holes, no binding at all.

The partially threaded design on these 230mm screws made installing into my machine jig much faster than using fully threaded ones, and the black oxide finish looks clean. They snugged up tight with a hex key without any stripping or wobble—solid hardware for precision work.