71904 CD/P4ADBA
71900 Series Super Precision Angular Contact Ball Bearings
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71904 CD/P4ADBA Bearing Product Overview & Core Advantages
The 71904 CD/P4ADBA is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. This duplex back-to-back (DB) matched set provides superior stability and can accommodate combined loads, handling significant radial loads and axial loads in both directions simultaneously. Manufactured to P4A tolerance class, it ensures ultra-precise running accuracy, making it ideal for high-speed spindles and other high-precision machinery. The phenolic cage and optimized internal geometry contribute to its excellent high-speed performance and smooth operation.
71904 CD/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
- 71904: Basic bearing series and size designation (20mm bore, 37mm OD, 18mm width)
- C: 15° contact angle, optimized for high-speed applications
- D: Duplex bearing configuration
- P4A: High precision tolerance class with specific runout requirements
- DB: Back-to-back mounting arrangement for increased moment rigidity
- A: Extra light preload for minimal friction and optimal high-speed operation
71904 CD/P4ADBA Bearing Structural Features & Performance Benefits
High Rigidity & Stability: The duplex back-to-back configuration creates a rigid bearing system that effectively resists moment loads and shaft deflection, ensuring precise shaft positioning under combined loads.
Superior Precision: Manufactured to P4A tolerance class with tight dimensional tolerances (bore: -0.004mm to 0, OD: -0.004mm to 0), this bearing delivers exceptional running accuracy and minimal vibration.
High-Speed Capability: The phenolic cage and 15° contact angle are optimized for high-speed operation up to 80,000 rpm, reducing centrifugal forces and maintaining stability at elevated speeds.
Enhanced Load Capacity: With a dynamic load rating of 2194 lbf and static load rating of 1440 lbf, this bearing set provides reliable performance under demanding operating conditions.
71904 CD/P4ADBA Bearing Typical Application Areas
The 71904 CD/P4ADBA is specifically engineered for high-precision, high-speed applications including:
- Machine Tool Spindles - for CNC machining centers, grinding machines, and milling equipment
- Precision Instrumentation - in measuring devices and analytical equipment
- High-Speed Motors - for spindle drives and precision servo applications
- Medical Equipment - in dental handpieces and surgical tools requiring high precision
- Aerospace Components - for guidance systems and precision actuators
