71912 CB/P4A
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 71912 CB/P4A is a single-row angular contact ball bearing designed for high-precision applications requiring exceptional rotational accuracy and rigidity. Engineered to support combined loads (simultaneous radial and axial loads), this bearing features a 15° contact angle optimized for axial load capacity. Its P4 (ABEC-7) tolerance class ensures minimal runout and vibration, making it ideal for high-speed spindles and precision machinery. The phenolic cage and preload availability contribute to its high-speed capability and stable operation under demanding conditions.
71912 CB/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71912 | Basic bearing designation (60mm bore, 85mm OD, 13mm width) |
| CB | Specific internal design with 15° contact angle and optimized internal clearance |
| P4A | P4 tolerance class (equivalent to ABEC-7) with specific dimensional and running accuracy requirements |
Structural Features and Performance Benefits
High Precision Construction: Manufactured to P4 tolerance standards, this bearing delivers exceptional dimensional stability and minimal runout for precision applications.
Optimized Load Capacity: The 15° contact angle provides superior axial load carrying capability while maintaining excellent radial load performance, making it suitable for combined loading conditions.
High-Speed Performance: The phenolic resin cage offers excellent strength-to-weight ratio, reducing centrifugal forces and enabling operation at limiting speeds up to 32,000 rpm.
Thermal Stability: Phenolic cage material maintains dimensional stability across the operating temperature range of -30°C to 110°C.
Preload Availability: Designed to accommodate preload, enhancing system rigidity and reducing vibration in high-precision applications.
71912 CB/P4A Bearing Typical Application Areas
- Machine tool spindles and high-speed machining centers
- Precision grinding spindles and dental equipment
- High-frequency motor spindles and robotics
- Aerospace positioning systems and navigation instruments
- Medical equipment requiring high rotational accuracy
- Test and measurement equipment spindles
