براغي رأس مقبس HOLO-KROME 65030 5/16-24 × 5/8" | رأس زر بمحرك سداسي | فولاد سبائك أكسيد أسود حراري (100 / عبوة)

The thermal black oxide finish on these screws looks great and seems to resist wear—installed a batch into a tooling fixture and they seated perfectly with a hex key.

Used these for a precision assembly jig and the socket drive seated perfectly, no stripping even with repeated torque. The thermal black oxide coating hasn’t shown a single speck of rust after a week in a humid shop, which is more than I can say for cheaper hardware. Hundred in the pack means I’ve g

The black oxide finish on these screws is holding up great in my tooling setup, no rust after a week of use. Fit perfectly into my precision assemblies with tight tolerances. At 100 count for the price, I've got plenty for future projects.