HOLO-KROME 87156 M10-1.5 X 25mm 內六角圓頭螺絲 | 平頭六角驅動 | 合金鋼熱處理黑色氧化 (100入/包)

Installing these into jig fixtures was a breeze, the black oxide finish gives them a nice uniform look under shop lights. They threaded cleanly into tapped holes without any binding, which saved me time on assembly.

The flat head sits perfectly flush in the counterbore, which was exactly what I needed for a tight assembly on a jig fixture. The black oxide finish feels durable and should resist rust well in my shop environment.

Installed a full set of these on a custom jig I'm building, and the black oxide coating is holding up perfectly against all the clamping pressure. The flat head sits flush without any wobble.