M5-0.8 x 18mm 內六角螺絲 | 六角驅動 | 全螺紋 | 12.9級合金鋼 鍍鋅 (400個/包)

The packaging is solid, and these M5 screws thread smoothly into my jig fixtures without binding. They’re strong enough for the precision assemblies I’m building, and the zinc coating looks clean and even.

The heads are perfectly formed, so my hex key seats without any wobble — a small thing, but it makes a difference when you're assembling precision jigs. The 12.9 alloy steel feels seriously sturdy for this price, and a full box of 400 means I won't be reordering for a while.

The threads cut clean and the zinc plating looks uniform across all 400 pieces, which is a relief for a batch this size. I've used them for jig assembly and the class 12.9 hardness gives me confidence they'll hold up under repeated torque.