71940 CD/P4ADBB
71900 Series Super Precision Angular Contact Ball Bearings
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71940 CD/P4ADBB Bearing Product Overview & Core Advantages
The 71940 CD/P4ADBB is a precision angular contact ball bearing configured as a duplex back-to-back (DB) matched set. Engineered for high rigidity and exceptional performance in demanding applications, this bearing is preloaded to Light / Class B standards, ensuring minimal deflection under combined loads. Its P4A tolerance class guarantees superior running accuracy, making it ideal for high-speed spindles and precision machinery where stability and reliability are paramount.
71940 CD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71940 | Basic bearing designation, indicating a high-precision angular contact ball bearing series. |
| C | Specifies a 15° contact angle, optimized for handling combined radial and axial loads. |
| D | Indicates the bearing is part of a duplex (matched pair) set. |
| P4A | Denotes a high precision tolerance class, exceeding ABEC 7/ISO P4 standards for dimensional and running accuracy. |
| DB | Specifies the Duplex Back-to-Back arrangement of the matched set, providing high moment stiffness. |
| B | Indicates the Light preload level applied to the matched set. |
71940 CD/P4ADBB Bearing Structural Features & Performance Benefits
High Rigidity & Moment Load Capacity: The duplex back-to-back (DB) arrangement creates a wide effective spread between load centers, significantly increasing the bearing's ability to resist moment loads and providing exceptional system rigidity. This is critical for maintaining precision under heavy combined loads.
Optimized Load Handling: With a 15° contact angle, this bearing is engineered to efficiently support substantial radial loads alongside axial loads in both directions, a key characteristic of angular contact ball bearings.
High-Speed Capability: The phenolic resin cage offers low weight and excellent sliding properties, contributing to lower friction and stable operation at the high limiting speed of 6,300 rpm. The bearings are supplied lubricated for immediate operation.
Precision Performance: Manufactured to P4A tolerance class with tight bore and outside diameter tolerances, this bearing ensures minimal runout and vibration, which is essential for high-speed and high-precision applications.
71940 CD/P4ADBB Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning centers requiring high rigidity and running accuracy.
- Precision Gearboxes: Applications demanding precise shaft positioning and low vibration.
- High-Frequency Motors and Spindles: Where high-speed performance and thermal stability are critical.
- Industrial Pumps and Compressors: For robust support under significant radial and axial combined loads.
