M8-1 X 50mm 內六角螺絲 | 六角驅動 | 部分螺紋 | 12.9級合金鋼鍍鋅 (100 / 包)

The hex socket drove in smoothly with a standard Allen key, and the zinc plating gives them a clean, professional look. These 12.9 grade screws held firm when I torqued them down on a tooling jig, no stripping at all.

I needed partially threaded bolts for a machinery rebuild, and these fit the bill perfectly with their precise M8x1 thread pitch. The zinc plating looks uniform and the hex socket drive engaged cleanly without any slop.

Bought these for a custom tooling fixture, and the 12.9 alloy steel is noticeably tougher than standard bolts. Partial threading gave me clean grip for the clamping section without extra length getting in the way.