M3-0.5 x 20mm 內六角螺絲 | 平頭六角凹槽驅動 | 全螺紋 | 12.9級合金鋼 鍍鋅 (400 個/包)

The hex socket drive bites cleanly without stripping, even at 12.9 grade hardness, and the zinc plating held up fine during assembly. For 400 pieces at this price, they’re a no-brainer for fixture work.

I've been using these in a few jigs on the bench and the hex socket drive takes a standard allen key without any stripping. The threads are consistent across all 400 pieces, which is exactly what I need for precision work.

The zinc plating on these M3-0.5×20mm screws is even and smooth, so they thread into my fixture plates without any binding or stripped heads. The class 12.9 alloy steel feels properly hard, and the hex socket drive seated perfectly with a 2mm Allen key.