HOLO-KROME 32244 5/8-11 X 1-1/4" Spitzkegel-Innensechskant-Gewindestifte | Legierter Stahl thermisch schwarz oxidiert (25/St.)

The hex socket drive made torquing these down into the tapped holes straightforward, and the thermal black oxide finish looks consistent across all 25 pieces. They’ve held a pulley firmly on a shaft for two weeks of daily use without backing out, which is exactly what I needed from a set screw this

The cup point bites into the shaft exactly where I need it, and the thermal black oxide finish makes them easy to grip even with oily fingers. Twenty-five per pack means I’ve got plenty of spares for the next job.

I used these to lock a sprocket onto a keyless shaft, and the black oxide coating seems like it’ll hold up well in a dirty environment. The hex socket drove in smoothly without stripping.