WD water pump bearings use once lubrication and also it is a kind of lifetime lubrication. It is normal for a small quantity of grease to come out of the seal lip. WD can supply the water pump bearing with below structures:

WB: double-row ball water pump spindle bearing

WR: single-row ball and single roller water pump spindle bearing

WB..C: double-row ball water punp angular contact bearing

WR..C:single-row ball and single roller water pump spindle bearing(four-point angular contact)

Usually, WR & WB can satisfy the most of loading requirements. Only under some special condition ,the inner structure will be designed as the high-hardness,like WB..C and WR..C series water pump bearing.