HOLO-KROME 87068 M5-0.8 X 20mm براغي رأس مقبس | رأس مسطح محرك مقبس سداسي | فولاذ سبائكي أكسيد أسود حراري (100 / عبوة)

I was worried about stripping the hex drive on these, but the thermal black oxide coating gave them a nice grip and they seated cleanly into my tooling jig. Sharp threading right out of the package.

These bolts fit perfectly in my precision assembly fixture and the black oxide finish seems like it'll hold up well against wear. For twenty bucks you get a solid hundred pieces that feel tougher than the standard zinc-plated ones I've used before.

I needed some solid M5 bolts for a jig I’m building, and these 20mm socket cap screws threaded in smoothly with no binding—the black oxide finish looks clean and hasn’t shown any wear yet.