... coefficient of friction3 Competitive price4 Variations of structure :A) Machined Type Needle roller bearing NA49, NA59, NA69,NKI, NKIS, BRI, TAFI ... ,NAO, NA...2RS, etcB) Machined Type Needle roller bearing without inner ringRNA49, RNA59, RNA69,NK, NKS ... ,FH,SN,MF,MFH,MFH,SCE,BCE,SCH,BCH,BA,B,BH,M,MH,HK...OH,etcD) Drawn Cup Needle Roller ...