71912 CD/P4AQBCD
71900 Series Super Precision Angular Contact Ball Bearings
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71912 CD/P4AQBCD Bearing Product Overview & Core Advantages
The 71912 CD/P4AQBCD is a precision quadruplex angular contact ball bearing designed for applications requiring exceptional rigidity and load capacity. This metric system bearing features a back-to-back matched arrangement (QBC) and a heavy preload (Class D), making it ideal for machine tool spindles and other high-precision machinery where maximum stiffness and rotational accuracy are critical. Its design is optimized to handle combined radial and axial loads simultaneously, providing stable performance under demanding operating conditions.
71912 CD/P4AQBCD Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71912 | Basic bearing designation (60mm bore, 85mm OD, 52mm width) |
| C | 15° contact angle |
| D | Heavy preload (Class D) |
| P4A | High-precision tolerance class (equivalent to ABEC 7) |
| QBC | Quadruplex Back-to-Back matched arrangement |
71912 CD/P4AQBCD Bearing Structural Features & Performance Benefits
This bearing's performance is defined by its sophisticated construction:
- Exceptional Rigidity: The quadruplex back-to-back arrangement and heavy preload create an extremely stiff bearing system that minimizes deflection under load, crucial for maintaining precision in machining operations.
- Superior Load Capacity: With a radial dynamic load rating of 11,700 lbf and static load rating of 13,950 lbf, it reliably handles significant combined loads while maintaining dimensional stability.
- Precision Performance: Manufactured to P4A tolerance class with tight dimensional controls (bore/OD tolerance: -0.004mm to 0), ensuring consistent high-precision operation.
- Optimized Internal Design: Features 24 chrome steel balls with 7.938mm diameter arranged in a phenolic cage, providing excellent guidance and stability at high speeds.
- Wide Temperature Range: Suitable for operations from -30°C to 110°C, accommodating various industrial environments.
71912 CD/P4AQBCD Bearing Typical Application Areas
The 71912 CD/P4AQBCD is specifically engineered for high-performance applications including:
- Machine Tool Spindles - High-speed milling, grinding, and turning centers
- Precision Rotary Tables - Indexing and positioning systems
- High-Rigidity Industrial Machinery - Where minimal deflection is critical
- Advanced Motion Control Systems - Robotics and automation equipment
- Specialized Medical Equipment - High-precision diagnostic and surgical devices
