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. Bower® Tapered Roller Bearing, Round Bore, Series: J Series, 68.263 mm Bore Dia, 127 mm Outside Dia, 36.512 mm W, Open Closure, 259000 N, Case Carburized Steel Bearing, -40 to 120 °C