براغي تثبيت رأس كبس بنقطة كوب M4 X 20mm | فولاذ سبائكي (500 / عبوة)

Installed these on a small gearbox shaft and they held firm without stripping. The cup point digs in nicely on hardened steel, and the hex socket made tightening in a cramped spot much easier than a slotted set screw would have.

Used these to lock down a pulley on a motor shaft and the cup point really dug in without stripping the hex drive. The 20mm length gave just enough reach in a tight spot, and the alloy steel feels solid for the price.

The hex socket drive made installing these in tight spots on my machine much easier than I expected. Each screw held firm with the cup point digging in nicely. This pack of 500 should last me through several projects.