HOLO-KROME 76180 M6-1 x 30mm 內六角螺絲 | 六角驅動 | 合金鋼熱處理黑氧化物 (100個/包)

The black oxide finish on these M6 screws is much more consistent than other fasteners I've tried, and the hex socket drive makes them a breeze to install in tight spots on my tooling setup. They thread smoothly into aluminum without needing to pre-tap, which saved me a lot of time on my latest proj

Used these for a jig I was building and the hex drive seated perfectly every time, no stripped heads. The thermal black oxide finish held up well even after some contact with cutting fluid, which is more than I can say for cheaper screws I've tried.

The black oxide finish is exactly what I needed for a jig I'm assembling — the heads seat cleanly in the hex driver without any slipping. Threads cut smoothly into the tapped holes, and the 30mm length is spot on for my fixture plates.