HOLO-KROME 72312 3/4-10 x 2-1/2" 內六角螺絲 | 六角插座驅動 | 合金鋼熱處理黑色氧化 (25 / 包)

Black oxide finish looks sharp and the threads cut cleanly with no chatter when I torqued them down on my jig fixture. The 3/4-10 size fits perfectly in the counterbore I machined, and all 25 in the pack had consistent depth on the hex socket. These are solid enough for heavy machinery work.

The black oxide finish on these screws handled the oil in my press jig without any rust or mess, which was a relief. They threaded cleanly into the tapped holes and held firm with no stripping. Exactly the quality I was hoping for in a heavy machine repair.

I needed a strong fastener for a new press fixture and these cap screws threaded in smoothly with no binding. The black oxide finish feels durable and should resist rust well in my shop.