Timken 2MM311WI DUL Fafnir

Description:

The Timken 2MM311WICRDUL (Manufacturing Part Number: 2MM311WI DUL, World Part Number: 7311C-T-P4S-DUL) is a matched duplex set of super precision single-row angular contact ball bearings from the Timken Fafnir® 300WI series. Factory matched with DUL (light 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 2MM311WICRDUL bearing set is engineered for high-speed spindle applications where accuracy, rigidity, and thermal stability are essential. Its duplex light preload arrangement improves spindle stiffness, minimizes vibration, and provides outstanding rotational accuracy, making it suitable 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): 2MM311WICRDUL (Manufacturing Part Number: 2MM311WI DUL)
• World Part Number: 7311C-T-P4S-DUL
• Manufacturer: Timken Fafnir
• Product Type: Super precision angular contact ball bearing set
• Bearing Type: Duplex matched single-row angular contact ball bearings
• Series: 300WI (ISO 7311C)
• Bore Diameter (ID): 55 mm
• Outside Diameter (OD): 120 mm (4.724 in)
• Bearing Width (Single): 29 mm (1.142 in)
• Total Width (Duplex Set): 58 mm (2.283 in)
• Contact Angle: 15°
• Arrangement: Duplex matched pair
• Preload: DUL (Light 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): 98,700 N (22,200 lbf) per bearing
• ISO Dynamic Radial Load Rating (C1): 89,800 N (20,200 lbf) per bearing
• Static Radial Load Rating (C0): 58,300 N (13,100 lbf) per bearing
• Limiting Speed (Grease): 9,300 rpm
• Limiting Speed (Oil): 15,800 rpm
• Maximum Shaft Fillet Radius: 2.0 mm (0.079 in)
• Maximum Housing Fillet Radius: 2.0 mm (0.079 in)
• Function: Supports combined radial and axial loads in high-speed precision spindle applications.
• Features: Factory-matched duplex set, light preload, super precision construction, low runout, high rigidity, optimized for machine tool spindles, and excellent thermal stability.

Common Replacements:

• Timken 2MM311WICRDUL super precision bearing set
• SKF 7311 CD/P4A duplex bearing set
• NSK 7311CTYNSULP4 duplex bearing set