71948 CD/P4ADBB
71900 Series Super Precision Angular Contact Ball Bearings
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71948 CD/P4ADBB Bearing Product Overview & Core Advantages
The 71948 CD/P4ADBB is a duplex back-to-back angular contact ball bearing designed for applications requiring high precision and exceptional rigidity. This P4A tolerance class bearing is preloaded (Light / Class B) and comes as a matched set of two bearings, enabling it to handle combined radial and axial loads simultaneously. Its optimized design is engineered for high-speed operation and delivers superior performance in demanding, precision machinery.
71948 CD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71948 | Basic bearing series and size designation. |
| C | Designates a 15° contact angle, optimized for high-speed applications requiring high rigidity. |
| D | Indicates the bearing is supplied as a duplex pair. |
| DB | Specifies the Back-to-Back (DB) arrangement of the matched pair, providing high moment rigidity. |
| P4A | Denotes a high precision tolerance class with enhanced running accuracy. |
71948 CD/P4ADBB Bearing Structural Features & Performance Benefits
High Rigidity and Load Capacity: The duplex back-to-back (DB) arrangement creates a large effective spread between load centers, significantly increasing the bearing's moment stiffness and ability to withstand combined loads. The 15° contact angle is ideal for applications where high axial stiffness is required alongside radial support.
High-Speed Performance: The phenolic cage is lightweight and robust, contributing to lower centrifugal forces and stable operation at the high limiting speed of 7,500 rpm. The bearing is pre-lubricated for immediate operation.
Precision Engineering: Manufactured to P4A tolerance class with tight dimensional control on the bore diameter, outside diameter, and width, this bearing ensures minimal runout and superior rotational accuracy.
Durability: Constructed from chrome steel for both rings and balls, the bearing offers high fatigue life and reliability under demanding operating conditions within a temperature range of -30°C to 110°C.
71948 CD/P4ADBB Bearing Typical Application Areas
The 71948 CD/P4ADBB is ideally suited for high-precision, high-rigidity applications, including:
- Machine Tool Spindles (e.g., milling, grinding, and turning centers)
- High-frequency Precision Spindles
- Industrial Pumps and Compressors
- High-performance Gearboxes
