... steel, 4.Various size and type, 5.15-30days delive Auto water pump bearings are combined bearings only ... rows of balls; WIB, BWF, WS, WK, 885000 series, etc. 2) Ball-roller: With one row of ... one row of rollers; WIR, WN, WKH, 665000 series, etc. 2 Material: Mainly the chrome Steel (GCr15) ... ring is 60-64HRC Application of water pump bearings: Widely used in auto, machine,etc Water pump bearing W series