M12-1.75 x 50mm 內六角螺絲 | 平頭內六角驅動 | 全螺紋 | 等級10.9 合金鋼鍍鋅 (100顆/包)

Had to order these for a heavy-duty jig I was building, and the 10.9 alloy steel is noticeably tougher than standard hardware store bolts. The hex drive seated perfectly without any stripping. Exactly what precision work calls for.

Used them on a custom tooling fixture and the 10.9 alloy steel held up through a full shift without a single stripped head. The zinc plating looks clean and the flat heads sit flush just like I needed. Came in a sturdy box of 100, which is exactly what a shop like mine goes through.

Installed a full set of these on a jig fixture and every single one threaded in perfectly without any binding. The zinc plating looks consistent, no burrs on the threads, and the flat heads sit flush just as needed for precision work.