HOLO-KROME 72100 1/4-20 X 1英吋 內六角螺絲 | 六角驅動 | 合金鋼 熱處理黑色氧化 (100顆/包)

The thermal black oxide finish on these screws gives them a nice, uniform look and seems to resist wear well. I used a full box for a new jig setup and every single one seated cleanly without any burs.

These hex socket screws drove perfectly into my jig setup without any cam-out or stripping. The alloy steel feels noticeably more rigid than the standard hardware I've used in the past.

Put a whole batch of these in a drill press jig this afternoon and the black oxide finish held up perfectly with no galling. The hex drive fits snug and the threads are clean all the way down.