HOLO-KROME 72356 7/8-9 X 5" 內六角螺絲 | 內六角驅動 | 合金鋼 熱處理黑色氧化 (10顆/包)

These replaced some old bolts on a jig that had been giving me grief, and the black oxide finish is a nice touch for the shop floor. The threads cut clean and the alloy steel feels solid under load, no question about holding up in a precision assembly.

The black oxide coating on these screws makes them look clean and professional in my fixture assembly. The 5-inch length was perfect for the deep reach I needed in this tooling project, and the hex socket drive held the Allen key securely during tightening.

Put these in a jig I'm building and the threads cut smooth as butter, no binding at all. The 5-inch length is perfect for getting through thick brackets with room for a washer. Exactly what you need when precision matters.