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, 40 mm Bore Dia, 68 mm Outside Dia, 2 Rows, 21 mm W, Open Closure, 55500 N, Hardened Alloy Steel Bearing, Machined Brass Cage, 9700 RPM Grease/11000 RPM Oil Maximum, -40 to 120 °C