TIMKEN 2MM9108WICRDUM SUPER PRECISION BEARING SET

Description:

The Timken 2MM9108WICRDUM (Manufacturing Part Number: 2MM9108WI DUM, World Part Number: 7008C-T-P4S-DUM) is a matched duplex set of super precision single-row angular contact ball bearings from the Timken Fafnir® 9100WI series. Factory matched with DUM (medium preload), this bearing set is designed for high-speed machine tool spindles requiring exceptional rigidity, low runout, and precise shaft positioning. It is commonly used in CNC machining centers, milling machines, grinding machines, jig borers, precision lathes, and other high-accuracy manufacturing equipment.

Applications:

The Timken 2MM9108WICRDUM bearing set is engineered for high-speed spindle applications where accuracy, rigidity, and thermal stability are critical. Its duplex medium preload arrangement increases spindle stiffness, improves rotational accuracy, and minimizes vibration, making it ideal for CNC machining centers, high-speed milling machines, grinding machines, machining spindles, routers, and other industrial machine tools requiring super precision bearings.

Technical Specifications:

• Manufacturer Part Number (MPN): 2MM9108WICRDUM (Manufacturing Part Number: 2MM9108WI DUM)
• World Part Number: 7008C-T-P4S-DUM
• Manufacturer: Timken Fafnir
• Product Type: Super precision angular contact ball bearing set
• Bearing Type: Duplex matched single-row angular contact ball bearings
• Series: 9100WI (ISO 7008C)
• Bore Diameter (ID): 40 mm
• Outside Diameter (OD): 68 mm (2.677 in)
• Bearing Width (Single): 15 mm (0.591 in)
• Total Width (Duplex Set): 30 mm (1.181 in)
• Contact Angle: 15°
• Arrangement: Duplex matched pair
• Preload: DUM (Medium preload)
• Ball Material: Steel
• Cage Type: CR outer land riding cage
• Cage Material: MBR phenolic cage
• Precision Rating: ISO P4S (ABEC 7/9 equivalent)
• Dynamic Radial Load Rating (Ce): 21,900 N (4,920 lbf) per bearing
• ISO Dynamic Radial Load Rating (C1): 19,900 N (4,470 lbf) per bearing
• Static Radial Load Rating (C0): 14,900 N (3,360 lbf) per bearing
• Limiting Speed (Grease): 19,900 rpm
• Limiting Speed (Oil): 39,800 rpm
• Maximum Shaft Fillet Radius: 1.0 mm (0.039 in)
• Maximum Housing Fillet Radius: 1.0 mm (0.039 in)
• Function: Supports combined radial and axial loads in high-speed precision spindle applications.
• Features: Factory-matched duplex set, medium preload, super precision construction, low runout, high rigidity, optimized for machine tool spindles, and excellent thermal stability.

Common Replacements:

• Timken 2MM9108WICRDUM super precision bearing set
• SKF 7008 CD/P4A duplex bearing set
• NSK 7008CTYNSULP4 duplex bearing set