Cylindrical roller bearing, the rollers and raceways are in linear contact. Consequently this type of bearing can support a larger radial load than a point-contact ball bearing. Also, its structure is suitable for high-speed operation. A cylindrical roller bearing used for the main spindle of a machine tool can have either a double- or single row configuration, and certain variants have a tapered bore so the radial internal clearance can be adjusted. NTN Precision Cylindrical Roller Bearings, Series: NN3, 25 mm Bore Dia, 47 mm Outside Dia, 2 Rows, 16 mm W, Open Closure, 30000 N, Hardened Alloy Steel Bearing, Machined Brass Cage, 14000 RPM Grease/17000 RPM Oil Maximum, -40 to 120 °C