71911 CD/P4ADT
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 71911 CD/P4ADT is a precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and reliability. This duplex tandem (DT) arrangement provides superior axial rigidity and is preloaded for optimal performance. Its key advantages include the ability to handle combined loads efficiently, high limiting speed capabilities supported by a phenolic cage, and outstanding dimensional stability due to its P4A tolerance class. This configuration is ideal for compact, high-precision spindle designs.
71911 CD/P4ADT Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71911 | Bearing series and size designation (55mm bore, 80mm OD, 26mm width) |
| C | 15° contact angle, optimized for high-speed applications |
| D | Duplex bearing designation |
| P4A | High precision tolerance class (exceeds ABEC 7/ISO P4) |
| DT | Duplex Tandem arrangement for maximum axial load capacity in one direction |
Structural Features and Performance Benefits
High Rigidity and Load Capacity: The duplex tandem configuration combines two bearings to create an exceptionally rigid system capable of handling heavy axial loads in one direction while maintaining excellent radial load capacity. The 15° contact angle provides an optimal balance between radial and axial load performance.
Precision Performance: Manufactured to P4A tolerance class, this bearing ensures minimal runout and vibration, critical for high-speed applications. The tight dimensional tolerances (-0.004mm to 0 on bore and OD) guarantee precise fit and consistent performance.
High-Speed Capability: The phenolic cage enables superior performance at high rotational speeds (up to 34,000 rpm), offering excellent strength-to-weight ratio and compatibility with various lubricants. The bearing comes pre-lubricated for immediate operation.
Material Excellence: Constructed from chrome steel for both rings and balls, providing high hardness, wear resistance, and dimensional stability under varying temperature conditions (-30°C to 110°C).
71911 CD/P4ADT Bearing Typical Application Areas
The 71911 CD/P4ADT is specifically engineered for high-performance applications requiring precision and reliability:
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and precision lathes
- Precision Instruments: Measuring equipment, optical instruments, and laboratory apparatus
- High-Speed Motors: Spindle motors, high-frequency motors, and servo drives
- Aerospace Components: Gyroscopes, navigation systems, and auxiliary power units
- Medical Equipment: Dental handpieces, surgical tools, and diagnostic imaging systems
