71948 ACD/P4AQBCA
71900 Series Super Precision Angular Contact Ball Bearings
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71948 ACD/P4AQBCA Bearing Product Overview & Core Advantages
The 71948 ACD/P4AQBCA is a precision angular contact ball bearing configured in a quadruplex back-to-back (QBC) arrangement. Engineered for high rigidity and exceptional performance in demanding applications, this matched set is preloaded to Extra Light (Class A) standards. Its design is optimized to handle significant combined loads (radial and axial) simultaneously, making it an ideal choice for high-precision machinery requiring superior rotational accuracy and stability. The P4A tolerance class ensures ultra-precise dimensions and running accuracy.
71948 ACD/P4AQBCA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71948 | Basic bearing series and size designation. |
| ACD | Angular Contact design with a 25° contact angle. |
| P4A | Indicates a high-precision tolerance class, superior to ABEC 7. |
| QBC | Specifies a Quadruplex Back-to-Back matched set arrangement. |
71948 ACD/P4AQBCA Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The quadruplex back-to-back (QBC) arrangement creates a highly rigid bearing system that effectively resists moment loads. This configuration allows the set to handle substantial combined radial and axial loads. The 25° contact angle is optimized for supporting significant axial loads in one direction.
Precision & Speed Performance: Manufactured to P4A tolerance class, this bearing guarantees minimal runout and vibration. The phenolic cage contributes to smooth operation at high speeds, with a limiting speed of 7,500 rpm. The cage's lightweight properties reduce centrifugal forces, enhancing high-speed capability.
Material & Durability: Constructed from chrome steel for both rings and balls, the bearing offers high fatigue life and wear resistance. The set is pre-lubricated, ensuring immediate operational readiness and protection during the initial run-in period.
71948 ACD/P4AQBCA Bearing Typical Application Areas
This high-precision, high-rigidity bearing set is specifically designed for critical applications in:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers requiring extreme accuracy and rigidity.
- Precision Gearboxes: Especially in industrial robotics and high-performance automotive systems.
- High-Frequency Motors and Spindles: Where rotational stability and minimal runout are paramount.
