M16-2 X 50mm 內六角螺絲 | 六角驅動 | 全牙 | 12.9級合金鋼鍍鋅 (25入/包)

The threads are cut clean and the zinc plating looks uniform across all 25 pieces, which is exactly what I want for a jig I'm building. They torqued down smoothly without any galling, and the 12.9 hardness gives me confidence they'll hold up under repeated stress.

I needed some heavy-duty fasteners for a jig I was building, and these definitely delivered. The Class 12.9 rating gives me confidence they won't strip under full torque.

Installed these on a heavy-duty jig I’m building, and the hex socket drive made tightening them in tight spots much easier than I expected. The zinc plating looks clean and the threads are consistent out of the package.