M2-0.4 X 25mm 內六角螺絲 | 內六角驅動 | 12.9級合金鋼熱處理黑氧化物 (200 / 包)

Used a handful of these for mounting a small jig on my CNC, and the 25mm length was just right for the grip I needed. The hex socket drive engaged cleanly and the black oxide finish already seems to resist slight shop oil smudges.

I bought these for a robotics jig I'm building, and the black oxide coating looks much more professional than plain steel. The hex socket drive gave a secure grip with no stripping during installation. They fit perfectly into the pre-tapped holes.

Finally, a socket cap screw that doesn't strip on the first tighten — the 12.9 alloy steel feels properly rigid even at this tiny M2 size, and the black oxide finish gives them a nice, uniform look. Used a dozen on a jig build and every one seated clean with the hex key.