M16-2 x 80mm 內六角螺絲 | 平頭內六角驅動 | 部分螺紋 | 強度等級12.9 合金鋼鍍鋅 (25入/包)

Installed these in a jig for a production run and the hex socket held up to repeated high-torque tightening without any stripping. Class 12.9 alloy steel feels seriously tough for the price.

The partial threading on these M16 screws made them ideal for a jig I was building, grabbing cleanly without bottoming out. They feel solid in the hand and the zinc plating looks uniform across all 25 pieces. Exactly what I needed for heavy-duty tooling work.

The hex socket drive seated perfectly on my wrench, and the zinc plating has a clean, uniform finish. These 12.9 alloy steel screws feel substantial in hand and threaded into my fixture without any binding. Exactly the precision I expect for tooling work.