Igus RJ260UM-02-20, Bearing with 28mm Outside Diameter

DryLin polymer linear bearing, dimensionally compatible with compact bearings
Low friction, long life, and totally maintenance-free
Grooved design allows for thermal expansion and running in dirty and dusty environments

Self-Lubricating Bushes - Drylin™

Drylin™ bearings are manufactured from high performance polymers. They run without lubrication and require no maintenance. They consist of a polymer liner located in an aluminium housing. Both standard and self-compensating styles are available in closed and split configurations. Features include very low friction, suitability for high speed and acceleration use, high load bearing capacity and self-wiping design. The bearings run on aluminium, steel and ceramic shafts.