tapered roller bearing 31308 size:d=40mm,D=90mm,T=25.25mm,B=23mm tapered roller bearing 31308 size:d=40mm,D=90mm,T=25.25mm,B=23mm1.material:chrome steel2.quality certification:ISO9001:2000 system3.precision level:P0,P64.service:prompt delivery,OEM available5.Advantage:competitive prices with excellent quality Tapered Roller Bearing 31308