71920 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
71920 ACD/P4AQBCB Bearing Product Overview & Core Advantages
The 71920 ACD/P4AQBCB is a precision quadruplex angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This P4A tolerance class bearing features a back-to-back (QBC) matched arrangement of four bearings, enabling it to withstand combined radial and axial loads simultaneously. Its light preload (Class B) ensures smooth, precise operation with minimal runout, making it ideal for high-precision, high-rigidity systems. The phenolic cage and standard lubrication contribute to its reliable performance within a specified temperature range.
71920 ACD/P4AQBCB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71920 | Basic bearing series and size designation (100mm bore, 140mm OD). |
| 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. |
| B | Denotes a Light Preload / Class B for optimal stiffness and precision. |
71920 ACD/P4AQBCB Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The quadruplex back-to-back (QBC) arrangement creates an extremely rigid bearing system, effectively resisting complex combined loads and moments. This configuration provides superior axial and radial stiffness compared to single bearings.
Precision Performance: Manufactured to P4A tolerance class with a light preload, this bearing ensures minimal vibration and high running accuracy, which is critical for precision machinery.
Optimized High-Speed Operation: The phenolic cage offers low weight and excellent operational characteristics at high speeds, contributing to a limiting speed of 15,000 rpm. The 25° contact angle provides a balanced capability for axial and radial loads.
Durability & Reliability: Constructed from chrome steel for both rings and balls, the bearing ensures high durability and a long service life under demanding conditions.
71920 ACD/P4AQBCB Bearing Typical Application Areas
The 71920 ACD/P4AQBCB is engineered for high-performance applications where precision, rigidity, and speed are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Articulated arms and high-accuracy positioning systems.
- Aerospace & Defense Systems: Gyroscopes, radar equipment, and navigation systems.
- High-Frequency Spindles: PCB drilling and routing machines.
