M16 x 55mm 杯端內六角止付螺絲 | 合金鋼鍍鋅 (25 / 包)

The hex socket drive made installing these in tight spaces much easier than I expected. They threaded smoothly and feel really solid with the alloy steel construction.

I needed these for a maintenance job where vibration was an issue, and the hex socket drive let me tighten them down securely. The zinc plating on the alloy steel is holding up well so far.

The cup point grips firmly into the shaft, and the zinc plating shows no rust after a week in a damp garage. Installed them on a heavy-duty jig I’m building, and they hold adjustment perfectly under vibration.