Tapered Roller Bearings utilize conical rollers and raceways arranged so that the rollers and raceways meet at a common apex. The rollers are guided by contact between the large end of the roller and a rib on the inner ring. This provides high capacity for radial and single thrust loads. NTN Tapered Roller Bearing, Type TDO Round Bore, 320 mm Bore Dia, 480 mm Outside Dia, 2 Rows, 151 mm W, Open Closure, 3100000 N, Through Hardened Steel Bearing, Steel Cage