This single row cylindrical roller bearing NU309-E-XL-M1-C3 has a bore of 45.0 mm, an outside diameter of 100.0 mm, and a width of 25.0 mm, with a net mass of 0.98 kg. The outer ring carries two ribs while the inner ring is smooth (design type NU), making it a non-locating bearing that allows axial displacement between inner and outer ring. It features a machined brass cage (M1), the reinforced E design for increased load capacity, and radial internal clearance C3. Limiting speed is rated at 12800 1/min, with a reference speed of 6400 1/min. The non-locating NU configuration permits free axial movement, so this bearing suits positions where the shaft needs to compensate for thermal expansion without introducing axial preload. The C3 clearance accommodates tighter fits or moderate thermal growth without risking excessive internal load, while the P6 running accuracy class supports applications requiring tighter running tolerances than standard P0. As supplied, the bearing is unshielded and open, intended for oil or grease lubrication applied by the end user according to operating conditions.