71902 CD/P4ADBA
71900 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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Product Overview and Core Advantages
The 71902 CD/P4ADBA is a precision angular contact ball bearing designed for applications requiring exceptional accuracy and rigidity. As a duplex back-to-back (DB) matched set, this bearing configuration delivers superior high rigidity and moment load capacity. It features an extra light preload (Class A) for optimal performance in high-speed applications while maintaining precise rotational accuracy. Manufactured to P4A tolerance class, this bearing is engineered for machine tool spindles and other precision equipment where combination loads and thermal stability are critical factors.
71902 CD/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning | Performance Benefit |
|---|---|---|
| CD | Duplex Back-to-Back arrangement with 15° contact angle | Provides high moment stiffness and thermal stability |
| P4A | High precision tolerance class (ABEC 7 equivalent) | Ensures exceptional running accuracy and low vibration |
| DB | Matched set of two bearings in back-to-back configuration | Optimized for combined radial and axial load handling |
Structural Features and Performance Benefits
High Rigidity Design: The duplex back-to-back arrangement creates a wide effective spread between load centers, significantly enhancing moment stiffness and system stability under complex loading conditions.
Precision Performance: Manufactured to P4A tolerance standards with bore and outside diameter tolerances of -0.004mm to 0, ensuring minimal runout and vibration for smooth operation in high-speed applications.
Optimized Internal Geometry: Featuring a 15° contact angle and phenolic resin cage, this bearing achieves excellent high-speed capability with a limiting speed of 230,000 rpm while maintaining dimensional stability across the operating temperature range.
Premium Material Construction: Manufactured from chrome steel for both rings and balls, providing high fatigue resistance and durability under demanding operating conditions.
71902 CD/P4ADBA Bearing Typical Application Areas
- Machine Tool Spindles: High-precision machining centers, grinding spindles, and milling applications requiring exceptional accuracy and rigidity
- Precision Instrumentation: Measuring equipment, optical instruments, and laboratory apparatus demanding minimal vibration and runout
- High-Speed Rotary Systems: Dental handpieces, small precision motors, and turbo-molecular pumps operating at elevated speeds
- Robotics and Automation: Precision robot joints, CNC rotary tables, and positioning systems requiring high stiffness and accuracy
