Timken 2MM311WICRDUL Angular Contact Ball Bearing

The Timken 2MM311WICRDUL is a factory-matched duplex set of super precision single-row angular contact ball bearings from the Timken Fafnir 300WI series, designed for high-speed machine tool spindles where rigidity, low runout, and precise shaft positioning are critical, with MPN 2MM311WICRDUL, Manufacturing Part Number 2MM311WI DUL, and World Part Number 7311C-T-P4S-DUL. This 55 mm bore, 120 mm outside diameter duplex pair provides 29 mm per bearing width (58 mm total), a 15° contact angle, light preload (DUL), and uses a CR outer land riding cage with an MBR phenolic cage. It delivers ISO P4S precision (ABEC 7/9 equivalent) with dynamic radial load ratings of 98,700 N per bearing (Ce), 89,800 N ISO dynamic (C1), and a static rating of 58,300 N (C0), plus limiting speeds of 9,300 rpm grease and 15,800 rpm oil. Common applications include CNC machining centers, high-speed milling, grinding machines, jig borers, and precision lathes requiring high rigidity and thermal stability.