71904 CD/P4ADBC
71900 Series Super Precision Angular Contact Ball Bearings
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71904 CD/P4ADBC Bearing Product Overview & Core Advantages
The 71904 CD/P4ADBC is a precision angular contact ball bearing designed for demanding applications requiring high rotational accuracy and rigidity. This duplex back-to-back (DB) arrangement is preloaded (Moderate / Class C) to provide exceptional system stiffness and stability under combined loads, effectively managing both radial and axial forces. Manufactured to a P4A tolerance class, it guarantees superior running accuracy, making it ideal for high-speed, high-precision machinery where reliability is paramount.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 71904 | Basic bearing series and size designation (20mm bore, 37mm OD, 18mm width). |
| CD | Indicates a duplex bearing in a Back-to-Back (DB) arrangement. |
| P4A | Specifies the high-precision tolerance class, exceeding ABEC 7 standards. |
| DBC | Denotes a moderate preload (Class C) applied to the duplex set. |
71904 CD/P4ADBC Bearing Structural Features & Performance Benefits
High Rigidity & Stability: The back-to-back duplex configuration creates a wide, rigid support system that effectively resists moment loads and shaft deflection, ensuring precise alignment and minimal runout under operation.
Superior Load Capacity: With a 15° contact angle and duplex design, this bearing is engineered to handle significant combined radial and axial loads simultaneously, providing reliable performance in challenging load conditions.
Optimized High-Speed Performance: The lightweight phenolic resin cage minimizes centrifugal forces and inertial friction, contributing to a high limiting speed of 80,000 rpm. The bearing is pre-lubricated for immediate operation.
Precision Engineering: Manufactured from high-grade chrome steel for rings and balls, and held to P4A dimensional tolerances, this bearing delivers exceptional running accuracy, low noise, and low vibration levels.
71904 CD/P4ADBC Bearing Typical Application Areas
The 71904 CD/P4ADBC is ideally suited for high-performance applications, including:
- Machine Tool Spindles
- High-Frequency Machining Centers
- Precision Grinding Spindles
- High-Speed Robotic Drives
- Medical and Dental Equipment Spindles
