Heavy duty needle roller bearings consists of a machined and ground channel-shaped outer ring with a complement of needle rollers and a cage. The high-strength cage retains and guides the rollers. An optional lubrication groove and hole in the outer ring facilitates re-lubrication. These bearings can be used with or without machined and ground inner ring, depending on the suitability of the shaft as a raceway surface. Koyo Needle Roller Bearing, Caged Heavy Duty, Series: NK Metric Series, 26 mm Bore, 34 mm OD, 20 mm Width, Open Closure, 19.7 kN Dynamic/32 kN Static Load, Steel Cage, 11000 RPM Grease/17000 RPM Oil Maximum, 250 °F