... apindle bearings(four-point angular contact) 1) Ball-ball: With two rows of balls; WIB, BWF, WS, WK, 885000 series, etc. 2 ... of balls, one row of rollers; WIR, WN, WKH, 665000 series, etc. 2 Material: Mainly the chrome Steel (GCr15) High-chrome ... : Widely used in auto, machine,etc Water pump bearing WB series