71928 CD/P4ADBB
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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71928 CD/P4ADBB Bearing Product Overview & Core Advantages
The 71928 CD/P4ADBB is a precision duplex angular contact ball bearing designed for applications requiring exceptional rotational accuracy and rigidity. This matched back-to-back (DB) arrangement provides superior stability and can accommodate combined radial and axial loads from both directions. Manufactured to P4A tolerance class and featuring a light preload (Class B), this bearing is engineered for high-speed operation and demanding conditions where high rigidity and precise shaft positioning are critical.
71928 CD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71928 | Basic bearing series and size designation |
| C | 15° contact angle |
| D | Duplex (paired) bearing set |
| P4A | High-precision tolerance class (exceeding ABEC 7) |
| DB | Back-to-Back arrangement for maximum moment stiffness |
| B | Light preload classification |
71928 CD/P4ADBB Bearing Structural Features & Performance Benefits
Optimized Rigidity and Load Capacity: The duplex back-to-back configuration creates a wide effective spread, significantly enhancing system rigidity and moment load capacity. This design enables the bearing to handle substantial combined radial and axial loads simultaneously.
High-Speed Performance: The phenolic resin cage provides excellent strength-to-weight ratio, reducing centrifugal forces and enabling operation at limiting speeds up to 11,000 rpm. The 15° contact angle further optimizes the bearing for high-speed applications.
Precision Engineering: Manufactured to P4A tolerance standards with tight dimensional control (bore and OD tolerance: -0.004mm to 0), this bearing ensures minimal runout and vibration for precision applications.
Material Excellence: Constructed from chrome steel for both rings and balls, providing high hardness, wear resistance, and long service life under demanding operating conditions.
71928 CD/P4ADBB Bearing Typical Application Areas
- Machine Tool Spindles: High-precision milling, grinding, and turning centers requiring exceptional rigidity and accuracy
- High-Speed Machining Centers: Applications demanding both high rotational speeds and precise positioning
- Precision Gearboxes: Industrial transmission systems where minimal deflection and high load capacity are critical
- Robotic Systems: High-accuracy robotic arms and automation equipment
- Medical Equipment: Diagnostic imaging systems and surgical tools requiring smooth, precise motion
