HOLO-KROME 76188 براغي رأس أسطوانية M6-1 × 40 مم | محرك سداسي | فولاذ سبائكي أسود حراري (100 / عبوة)

The black oxide finish on these screws gives them a nice, uniform look and seems to resist rust well so far. I’ve used them to rebuild a couple of jigs and they drive in smoothly with a hex wrench, no stripped heads. Exactly what I needed for precision assembly work.

I needed a solid batch of M6 socket cap screws for a jig build, and the 40mm length was perfect for my thicker clamping plates. The hex socket drive seated cleanly with my wrench.

The black oxide coating on these is holding up perfectly on my machine tooling, no chips after a week of adjustments. The hex socket drive engages cleanly without any wobble.