Timken 2MM9108WICRDUM Super Precision Bearing Set

The Timken 2MM9108WICRDUM is a factory-matched duplex set of super-precision single-row angular contact ball bearings from the Timken Fafnir 9100WI series, designed for high-speed machine tool spindles that require exceptional rigidity, low runout, and precise shaft positioning. This duplex, medium-preload arrangement has 40 mm bore, 68 mm outside diameter, and 15 mm single bearing width (30 mm total for the pair), a 15° contact angle, ISO P4S precision, CR outer land riding cage, and MBR phenolic cage material. The MPN is 2MM9108WICRDUM (Manufacturing Part Number: 2MM9108WI DUM) with World Part Number 7008C-T-P4S-DUM, providing dynamic radial load ratings of 21,900 N per bearing, static rating of 14,900 N, and limiting speeds of 19,900 rpm (grease) and 39,800 rpm (oil). It is commonly used in CNC machining centers, high-speed milling and grinding machines, machining spindles, and other high-accuracy machine tools requiring super-precision guidance and thermal stability.