HOLO-KROME 72210 7/16-14 x 3" 內六角螺絲 | 六角驅動 | 合金鋼熱處理黑色氧化 (25 / 包)

The thermal black oxide finish on these screws resists wear way better than the plain steel ones I've used before. They threaded smoothly into my precision assembly jig without any binding. Exactly what I needed for a clean, professional build.

The black oxide finish on these screws gives them a nice grip without being too slick, and the hex drive fit my allen wrench perfectly. Used them to rebuild an old press fixture, and they torqued down solid without any stripping.

Needed some strong fasteners for a jig I was building, and these black oxide socket cap screws worked perfectly. The hex socket drive engaged cleanly without any stripping.