71905 CD/P4ADBC
71900 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
71905 CD/P4ADBC Bearing Product Overview & Core Advantages
The 71905 CD/P4ADBC is a precision duplex angular contact ball bearing designed for applications requiring exceptional rigidity and rotational accuracy. This matched back-to-back (DB) arrangement is preloaded to Moderate / Class C specifications, delivering superior system stability and resistance to complex combined loads. Its P4A tolerance class ensures ultra-precise running accuracy, making it ideal for high-speed spindles and other demanding precision machinery where high rigidity and minimal runout are critical.
71905 CD/P4ADBC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71905 | Basic bearing designation indicating a 25 mm bore, 42 mm OD, and 18 mm width. |
| C | 15° contact angle, optimized for carrying combined radial and axial loads. |
| D | Indicates the bearing is part of a duplex pair. |
| DB | Back-to-Back mounting arrangement, which provides high moment rigidity. |
| P4A | High precision tolerance class for superior running accuracy and low vibration. |
| Open | No seals or shields, allowing for higher limiting speeds in clean environments. |
71905 CD/P4ADBC Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex back-to-back (DB) design creates a wide, rigid support system that effectively resists moment loads and complex combined loads. The moderate preload (Class C) eliminates internal clearance, ensuring precise shaft positioning and enhanced system stiffness.
High-Speed Performance: The lightweight phenolic cage and open design contribute to low friction and lower centrifugal forces, enabling a high limiting speed of 100,500 rpm. The 15° contact angle provides an excellent balance between radial load capacity and high-speed axial load performance.
Precision & Material Quality: Manufactured to P4A tolerance class with chrome steel rings and balls, this bearing guarantees exceptional dimensional stability, low noise, and long-term precision under demanding operating conditions.
71905 CD/P4ADBC Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning centers requiring extreme accuracy and rigidity.
- Precision Rotary Systems: Indexing tables, rotary encoders, and measuring instruments.
- High-Frequency Motors: Spindles for PCB drilling and other high-RPM applications.
- Medical Equipment: High-speed centrifuges and dental handpieces.
