... pump bearing 1.Material:stainless steel or as required2.Series:W, W-S, WN, WS, WNS, WK, WKN3.ISO9001:20004.OEM supplier5. Water ... high speed revolution6.We can supply these series:W Series (Ball-ball Type); W-S Series (Ball-ball Type); WN Series (Ball- ... ); WK Series ( Ball-ball Type); WKN Series (Ball-roller TypeW, W-S, WN, WS, WNS, WK, WKN7.Application: automotive, motorcycles, engineering equipment ...