Timken 2MM9306WICRDUL Angular Contact Ball Bearings

The Timken 2MM9306WICRDUL is a factory-matched duplex set of super-precision single-row angular contact ball bearings from the Timken Fafnir 9300WI series, designed for high-speed machine tool spindles requiring exceptional rigidity, low runout, and precise shaft positioning. This light-preload DUL arrangement provides increased spindle stiffness and reduced vibration, with a 15° contact angle and a duplex width of 18 mm (two 9 mm-wide bearings) that share axial and radial loads for stable operation. Specifications include bore 30 mm, outside diameter 47 mm, single bearing width 9 mm, total duplex width 18 mm, ISO P4S (ABEC 7/9 equivalent) precision, and CR outer land riding cage with an MBR phenolic cage material. Dynamic radial load rating is 6.61 kN (1,486 lbf) per bearing and static radial load rating is 9.54 kN (2,145 lbf) per bearing. Limiting speeds are 29,000 rpm under grease lubrication and 58,000 rpm under oil lubrication; maximum shaft fillet radius and housing fillet radius are both 0.6 mm. It is intended for high-speed spindle applications where accuracy, rigidity, and thermal stability matter, including CNC machining centers, high-speed milling machines, grinding machines, machining spindles, jig borers, and precision lathes. The bearing set is manufactured by Timken Fafnir, with World Part Number 71906C-T-P4S-DUL and Manufacturer Part Number 2MM9306WICRDUL.