71948 ACD/P4AQBCB
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
71948 ACD/P4AQBCB Bearing Product Overview & Core Advantages
The 71948 ACD/P4AQBCB is a precision angular contact ball bearing configured in a Quadruplex Back-to-Back (QBC) matched set. Engineered for applications demanding the highest levels of accuracy and rigidity, this bearing is designed to accommodate combined loads (radial and axial) simultaneously. Its P4A tolerance class ensures exceptional dimensional and running accuracy, making it ideal for high-precision, high-reliability machinery where superior rotational stability is paramount. The matched set configuration provides outstanding system rigidity and moment load capacity.
Model Code Breakdown
| 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 (equivalent to ABEC 7/ISO P4), with enhanced running accuracy requirements. |
| QBC | Signifies the bearing is supplied as part of a Quadruplex Back-to-Back matched set of 4 bearings. |
| B | Denotes a Light preload (Class B) applied to the matched set for optimal rigidity and rotational accuracy. |
71948 ACD/P4AQBCB Bearing Structural Features & Performance Benefits
High Rigidity and Load Capacity: The Quadruplex Back-to-Back (QBC) arrangement creates an extremely rigid bearing system capable of withstanding heavy combined loads and significant moment loads. This configuration provides exceptional operational stability under demanding conditions.
Precision Performance: Manufactured to P4A tolerance class, this bearing guarantees minimal runout and vibration, which is critical for applications requiring high positional accuracy and smooth operation.
Optimized High-Speed Capability: The phenolic cage offers excellent strength-to-weight ratio, reducing centrifugal forces and allowing for higher limiting speeds. The 25° contact angle provides a balanced capacity for both radial and axial loads at high rotational velocities.
Durable Construction: Manufactured from chrome steel for both rings and balls, the bearing ensures high fatigue life and durability. The open seal type allows for optimal lubrication management in controlled environments.
71948 ACD/P4AQBCB Bearing Typical Application Areas
The 71948 ACD/P4AQBCB is engineered for the most demanding high-precision and high-rigidity applications, including:
- Machine Tool Spindles (e.g., grinding, milling, and turning centers)
- High-Speed Precision Spindles
- Industrial Robotics (precision rotary joints and arms)
- Aerospace Test Rigs and positioning systems
- Advanced Medical Equipment (e.g., CT scanner gantries)
