Swivel Hub

The swivel hub provides a compact way to create radial motion between parallel surfaces.  There are steel balls between the top and the bottom aluminum sides which run inside a groove and offer a low coefficient of friction for the swivel hub.  Note that swivel hubs are intended for low RPM and for back and forth movements and best when the hub is oriented horizontally.  For wheel applications and those that demand several turns in one direction, consider using a shaft and bearings.