71948 ACD/P4ADBD
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/P4ADBD Bearing Product Overview & Core Advantages
The 71948 ACD/P4ADBD is a precision duplex angular contact ball bearing designed for applications demanding exceptional rigidity and accuracy. This matched back-to-back arrangement is preloaded to Class D (Heavy), providing superior stiffness and rotational accuracy under complex loading conditions. Its primary advantage lies in its ability to handle significant combined loads—simultaneous radial and axial forces—making it ideal for high-precision, high-rigidity machinery where minimal deflection is critical.
71948 ACD/P4ADBD Bearing Model Code Explained, Specifications & Naming Convention
- 71948: Basic bearing designation indicating a 240 mm bore, 320 mm outside diameter.
- ACD: Angular Contact design with a Duplex (DB) back-to-back configuration.
- P4A: Denotes a high-precision tolerance class (superior to ABEC 7), ensuring extremely tight dimensional and running accuracy.
- DB: Specifies the Duplex Back-to-Back mounting arrangement, which provides high moment rigidity.
71948 ACD/P4ADBD Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex back-to-back (DB) design and heavy preload (Class D) create an exceptionally stiff bearing system, effectively resisting moment loads and shaft deflection. With a 25° contact angle, it offers excellent performance for substantial combined radial and axial loads.
Precision & Speed Performance: Manufactured to P4A tolerance class, this bearing guarantees minimal runout and vibration. The phenolic resin cage and optimized internal geometry contribute to stable operation at the specified limiting speed.
Material & Construction: Components are manufactured from high-grade chrome steel, providing high fatigue life and durability. The bearing is supplied lubricated and ready for installation.
71948 ACD/P4ADBD Bearing Typical Application Areas
This bearing is engineered for the most demanding applications in:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers requiring maximum rigidity and precision.
- Precision Gearboxes: Industrial gearboxes subject to high torque and complex loading.
- High-Rigidity Rotary Tables: Indexing and rotary tables in machining and automation systems.
- Specialized Industrial Machinery: Applications where precise axial positioning and high stiffness are paramount.
