M3-0.5 X 30mm 內六角螺絲 | 六角驅動 | 部分螺紋 | 12.9級合金鋼鋅鍍 (400個/包)

Needed exactly 400 for a batch of jig fixtures, and the 12.9 alloy steel gives me confidence they won't strip under load. The zinc plating looks uniform and clean, which is a nice bonus for a functional fastener.

The hex socket drive on these M3 screws is machined so cleanly that my Allen wrench seats perfectly every time, no wobble or stripped corners even after repeated tightening. I’ve got them holding a jig together under constant vibration and they’ve stayed rock solid for weeks.

Used a full package of these on a custom jig I’m building, and the hex socket drive bit into the driver perfectly without any stripping. The 12.9 alloy steel feels noticeably tougher than the cheaper screws I’ve used before, and the zinc coating has held up well even with some heavy clamping force.