4mm Flanged Wheel Lock Nuts (10)

I’m using these for a small cart axle I built, and the nylon locking insert holds tight even after a few bumps. The flange is just wide enough to spread the load without needing a washer.

These little flanged nuts have totally fixed the loose wheel issue on my kids' go-kart. The nylon locking feature keeps them snug even after a full afternoon of hard turns.

I was tired of wheels wobbling on my RC car, but these 4mm flanged nuts grip the axle securely thanks to the nylon locking insert. The flanged base distributes pressure evenly, so I don’t need separate washers. A solid set of 10 for the price.