Linear ball bearings
These are composed of an outer ring, steel balls, and a cage, where the steel balls circulate the ball bearing. The result is a smooth and precise infinite linear motion.
Linear roller bearings
These contain cylindrical rollers capable of circulating within the block (orbital unit), enabling smooth linear motion on a flat surface. The cylindrical rollers are retained and guided by the cage (separator) and the ribs of the block.
The construction does not allow contact between adjacent rollers, meaning the friction coefficient is low.
Linear flat roller bearings
These are composed of a needle roller integrated into a flat cage. Linear flat roller bearings can be inserted on two planes to ensure smooth reciprocating motion with less friction coefficient.