HOLO-KROME 61054 1/2-20 X 1-1/4" 內六角螺絲 | 平頭內六角驅動 | 合金鋼熱處理黑氧化 (50 / 包)

The flat head sits perfectly flush in my jig’s counterbore, and the hex drive made tightening them a breeze without stripping. These feel sturdy enough for the machine tool rebuild I’m doing.

The black oxide finish is flawless across all 50 pieces, and the flat head sits perfectly flush in my precision fixture without any wobble. Thread engagement feels smooth and consistent on every single screw, which is exactly what I need for repeated assembly work in my shop.

Installing these in a jig I'm building—the black oxide finish looks sharp and the threads cut cleanly without any binding. They fit the flat head countersink perfectly, and the 50-count box will last me a while.