M5-0.8 x 25mm 內六角螺絲 | 內六角驅動 | 全螺紋 | 合金鋼 12.9 級熱處理黑色氧化 (600 / 包)

Needed a bulk order for a jig fixture and these came out of the box with a uniform black oxide finish that looks clean and feels grippy. The 12.9 alloy steel is definitely stiff when torquing, no stripping or flex across the 600 pieces I've used so far.

The black oxide finish looks properly done — no flaking or uneven spots across the 600 pieces, which matters when you’re building jigs that sit on a bench all day. Threads cut cleanly into tapped holes without any binding, and the hex drive grabs solidly. Exactly what I’d expect from a 12.9-grade fa

I needed a full pack of 12.9-grade screws for a clamping fixture, and these black oxide M5s look exactly like the precision fasteners I'm used to in tooling shops. The hex socket drive engages cleanly with no wobble, so I can torque them down confidently for my jig assembly.