Tapered roller bearing consist of an inner ring (cone), an outer ring (cup), a cage and rollers which are profiled to distribute the load evenly. They are mainly used in automobile rear axle wheel hub, heavy machine tool main shaft, big power reduction gear, axletree axle box, roller wheel of transportation device etc. 1) Taper roller bearings are generally used to support combined load mainly consisting of radial load. Their cups are separable for easy assembling. During mounting and using, radial clearance and axial clearance can be adjusted and preloaded mounting can be made. 2) includes: 30202~30222 30302~30320 32204~32222 32304~32313 32005x~32022x 3)Gcr 15 (AISI 52100/DIN 100Cr6/JIS SUJ2)chrome steel material 4)Tolerance standard: GB/T307(ISO492) 5)Hardness: HRC60-HRC65 6)ISO9001 certificate 7)single color box or tube or industrial paper packing