... or as required2.Series:W, W-S, WN, WS, WNS, WK, WKN3.ISO9001:20004.OEM supplier5. Water pump bearing is the ... ); WS Series (Ball-ball Type); WNS Series (Ball-roller Type); WK Series ( Ball-ball Type); WKN Series (Ball-roller TypeW, W ... -S, WN, WS, WNS, WK, WKN7.Application: automotive, motorcycles, engineering equipment, electro-motive tools, textile ...