M3-0.5 X 10mm 內六角圓頭螺絲 | 杯頭六角孔驅動 | 全牙 | 10.9級合金鋼鍍鋅 (800顆/包)

The zinc plating looks even and clean on every single screw, which matters when they're visible on a fixture. Threads cut smoothly into aluminum without any binding, and the hex socket grips the driver firmly at 10.9 hardness.

Put a few of these into a jig I was building and the 10.9 grade held up perfectly under heavy clamping force. The zinc plating looks even and hasn't chipped off during assembly.

I've been using these M3 button head screws for mounting small PCBs and jigs, and the 10.9 alloy steel gives them a noticeably tough feel compared to cheaper stainless ones. The zinc plating hasn't shown any rust after a few months in a slightly humid workshop.