7020 CD/P4AQBCA
7000 Series Super Precision Angular Contact Ball Bearings
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7020 CD/P4AQBCA Bearing Product Overview & Core Advantages
The 7020 CD/P4AQBCA is a high-precision quadruplex angular contact ball bearing designed for applications demanding exceptional rigidity and rotational accuracy. This matched set features four bearings arranged in a back-to-back (QBC) configuration, providing superior stability and high rigidity to withstand complex combined loads, including significant radial and axial forces. Manufactured to P4A tolerance class with an Extra Light (Class A) preload, it is engineered for high-speed operation and is pre-lubricated for immediate use in critical machinery.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 7020 | Standard bore diameter (100 mm) and series designation. |
| CD | Indicates a duplex bearing with specific internal clearance and preload. In this context, it is part of a matched set. |
| P4A | Denotes a high-precision tolerance class (superior to ABEC 7), ensuring minimal runout and vibration for smooth, accurate operation. |
| QBC | Signifies the bearing arrangement: Quadruplex Back-to-Back. This configuration maximizes rigidity and moment load capacity. |
7020 CD/P4AQBCA Bearing Structural Features & Performance Benefits
Optimized Rigidity and Load Capacity: The quadruplex back-to-back arrangement creates a highly rigid bearing system that effectively resists moment loads and complex combined loads. The 15° contact angle is optimized to handle substantial axial loads in both directions simultaneously.
High-Speed Performance: The phenolic cage offers low weight and excellent performance at high speeds, contributing to the bearing's limiting speed of 20,000 rpm. The precision-ground chrome steel balls and raceways minimize friction and heat generation.
Precision and Longevity: Manufactured to P4A tolerance class with tight dimensional control on the bore diameter, outside diameter, and width, this bearing ensures consistent, high-accuracy performance. The pre-lubrication facilitates immediate startup and reliable operation within the specified temperature range.
7020 CD/P4AQBCA Bearing Typical Application Areas
This precision bearing set is ideally suited for high-performance applications where maximum rigidity and speed are critical, including:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers.
- Precision Gearboxes: Especially in high-torque, high-speed industrial drives.
- Industrial Pumps and Compressors: Where reliable operation under significant axial and radial loads is required.
- Aerospace and Defense Systems: In critical rotating assemblies demanding the highest levels of precision and reliability.
