... .Material: Bearing steel, 4.Various size and type, 5.15-30days delive Auto water pump bearings are combined bearings only for auto water pumps. ... double row bearings, We can supply all kinds of water pump bearing ball-ball and ball-roller. With high-quality material ... hardness of outer ring is 60-64HRC Application of water pump bearings: Widely used in auto, machine,etc Water pump bearing WB series