M4-0.7 X 25mm 內六角螺絲 | 內六角驅動 | 全牙 | 8.8級合金鋼熱處理黑氧化物（600 / 包）

I’ve been using a few dozen of these M4-0.7 x 25mm screws to assemble jigs in my workshop, and the 8.8 grade alloy steel holds torque way better than the cheaper stuff I’ve tried. The hex socket drive engages cleanly every time, and the black oxide finish seems to resist minor scuffs without flaking

The black oxide finish on these screws is both sleek and practical, resisting scratches during installation. They drove smoothly into my jig fixture without any cam-out, and the 25mm length was exactly what I needed. For precision work like this, the 600-pack will last me a good while.

Finally got around to swapping out some old bolts on my milling fixture—these M4s threaded in smoothly and the black oxide finish looks much cleaner than plain steel.