WBC Thrust Ball Bearings can be separated is comprised of inner ring, outer ring, transmissioner(ball) and retainer.

 Thrust Ball Bearings can sustain weight on the direction of axis and is usually used at low and medium
 speed. On a slope, the Thrust Ball Bearings become sensitive and can firmly support in the direction of axis.
 In order to absorb impact of a slope in any case, a washer is used.
 There are a single direction Thrust Ball Bearingsthat receives load only in the direction of axis and a double
 direction thrust bearing that receives load in both direction of axis.
 Single thrust ball bearing / double thrust ball bearing / miniature thrust bearing / king pin trust bearing.