HOLO-KROME 76248 M8-1.25 X 35mm 內六角螺絲 | 六角驅動 | 合金鋼熱處理黑氧化物 (100顆/包)

Used these for a precision fixture at work—the threads cut clean and seated flush without any binding. The black oxide finish is holding up nicely against light oil residue so far.

Working on a jig that gets a lot of vibration, and these M8 bolts haven't loosened or stripped at all after weeks of use. The black oxide coating seems to handle shop oil and minor moisture better than standard zinc.

These hold up great in my precision assembly fixtures; the black oxide finish hasn't chipped or corroded even after months of regular use. The hex socket drive is crisp, so my Allen key fits snugly every time without any stripping.