HOLO-KROME 76400 M12-1.75 x 75mm 內六角帽螺絲 | 六角內六角驅動 | 合金鋼熱處理黑色氧化 (50 / 包)

Put these into a jig for some repeat drilling operations, and the black oxide finish held up perfectly against the chips and coolant. The hex drive seated firmly without any cam-out, even under repeated torque.

Bought these for a vise restoration and the black oxide finish feels way more durable than standard zinc plating. The hex drive seated perfectly without any cam-out, and they’re exactly the M12-1.75 length I needed.

I needed some reliable fasteners for a jig I was building, and these M12 socket cap screws fit perfectly. The black oxide finish seems tough and the hex drive seated nicely without any stripping.