Tapered roller Bearing 31308 size:d=40mm,D=90mm,T=25.25mm,B=23mm The Description of Tapered Roller Bearing------ ... file in the products based on user requirements given, don't need to adjust by the user. ------Tapered roller bearings taper ... , metallurgical, plastic machinery, etc. Tapered roller Bearing 31308 size:d=40mm,D=90mm,T=25.25mm,B=23mm1.material:chrome steel2.quality certification ...