M14-1.5 X 55mm 內六角螺絲 | 內六角驅動 | 全螺紋 | Class 12.9 合金鋼鍍鋅 (25 顆/包)

Needed a strong bolt for a heavy machinery mount, and these hex socket screws held torque perfectly with no stripping. The zinc coating looks durable, and the fully threaded design made installation straightforward.

Installed these on a custom jig and the Class 12.9 hardness really holds up under clamping force. The hex socket drive made tightening in tight spots much easier than expected.

The hex socket drive worked perfectly with my standard Allen key, and the zinc plating on these M14s seems like it will hold up well against rust. I used them to secure a heavy-duty tooling fixture, and the 55mm length gave me plenty of thread engagement without bottoming out.