71948 ACD/HCP4AQBCA
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71948 ACD/HCP4AQBCA
Basic Information
System of measurement
Metric
Weight
23.9 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
240 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
320 mm
Outside diameter tolerance
-0.004mm to 0
Width
152 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
25.4 mm
Ball quantity
31
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
128700 lbf
Radial static load rating
274500 lbf
Limiting speed
7.5 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Quadruplex Back-to-Back (QBC)
Number of bearings in matched set
4
Universal matching bearing
No (Standard)
Preload
Extra light / Class A
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
In Stock
Price available upon request.
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71948 ACD/HCP4AQBCA Bearing Product Overview & Core Advantages
The 71948 ACD/HCP4AQBCA is a precision quadruplex angular contact ball bearing designed for the most demanding applications. Engineered as a matched set of four bearings in a back-to-back (QBC) arrangement, it delivers exceptional system rigidity and stability. Its core advantages include the ability to handle combined radial and axial loads simultaneously, superior running accuracy due to its P4A tolerance class, and high-speed capability enabled by its ceramic balls and phenolic cage. This configuration is ideal for applications requiring maximum stiffness and precise rotational accuracy.
71948 ACD/HCP4AQBCA Bearing Model Code Explained, Specifications & Naming Convention
The model number 71948 ACD/HCP4AQBCA is decoded as follows:
- 71948: Basic series designation for a high-precision angular contact bearing.
- ACD: Angular Contact design with a 25° contact angle.
- HCP4A: High Capacity design with P4A super-precision tolerance class.
- QBC: Denotes a Quadruplex (4-bearing) set in a Back-to-Back arrangement (Configuration).
71948 ACD/HCP4AQBCA Bearing Structural Features & Performance Benefits
- Exceptional Rigidity and Stability: The quadruplex back-to-back (QBC) matched arrangement creates an extremely rigid bearing system, effectively resisting complex moment loads and maintaining shaft positioning under heavy combined loads.
- High-Speed Performance: The combination of lightweight ceramic balls (Silicon Nitride) and a phenolic resin cage significantly reduces centrifugal forces and inertial friction, enabling a high limiting speed of 7,500 rpm. The open design facilitates efficient lubrication and heat dissipation.
- Superior Load Capacity: With a dynamic load rating of 128,700 lbf and a static load rating of 274,500 lbf, this bearing is built to withstand significant radial and axial forces, ensuring long-term reliability in heavy-duty operations.
- Precision Operation: Manufactured to P4A tolerance class standards, this bearing guarantees minimal runout and vibration, which is critical for achieving high levels of rotational accuracy.
71948 ACD/HCP4AQBCA Bearing Typical Application Areas
This high-precision, high-rigidity bearing set is specifically engineered for advanced machinery, including:
- High-Speed Machine Tool Spindles (e.g., for milling, grinding, and turning centers)
- Precision Gearboxes and Turbocharger Systems
- Industrial Pumps and Compressors
- Aerospace Actuation Systems and Robotic Rotary Joints
