7020 ACB/HCP4AQBCA
Hybrid Ceramic Super Precision Bearings
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7020 ACB/HCP4AQBCA Bearing Product Overview & Core Advantages
The 7020 ACB/HCP4AQBCA is a high-precision quadruplex angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This matched bearing set features four bearings arranged in a back-to-back (QBC) configuration, providing superior stability and moment load capacity. Manufactured to P4A tolerance class with an extra light preload (Class A), it delivers extremely smooth operation and precise rotational accuracy. The use of ceramic balls and a phenolic cage enables outstanding high-speed performance up to 21,000 rpm, making it ideal for machine tool spindles and other precision machinery where combination loads and thermal stability are critical.
7020 ACB/HCP4AQBCA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7020 | Basic bearing series with 100mm bore diameter and 150mm outside diameter |
| ACB | Angular Contact Bearing with 25° contact angle |
| HCP4A | High Precision P4A tolerance class with special internal clearance |
| QBC | Quadruplex Back-to-Back arrangement of four matched bearings |
7020 ACB/HCP4AQBCA Bearing Structural Features & Performance Benefits
Enhanced Rigidity & Load Capacity: The quadruplex back-to-back arrangement creates an exceptionally rigid bearing system capable of withstanding heavy combination loads, including significant moment loads. This configuration provides optimal preload distribution across all four bearings.
High-Speed Capability: The combination of ceramic balls (reducing centrifugal forces and friction) and phenolic resin cage enables operation at limiting speeds of 21,000 rpm. The lightweight construction minimizes inertial effects during acceleration and deceleration.
Precision Performance: Manufactured to P4A tolerance class with bore and outside diameter tolerances of -0.004mm to 0, ensuring precise fit and minimal runout. The extra light preload (Class A) minimizes friction while maintaining positional accuracy.
Thermal Stability: The back-to-back arrangement accommodates thermal expansion effectively, maintaining preload consistency across the operating temperature range of -30°C to 110°C.
7020 ACB/HCP4AQBCA Bearing Typical Application Areas
- Machine Tool Spindles: High-precision milling, grinding, and turning centers requiring extreme rigidity and accuracy
- High-Speed Machining Centers: Applications demanding both high rotational speeds and heavy cutting loads
- Precision Grinding Spindles: Where minimal vibration and maximum rotational accuracy are critical
- Industrial Robotics: High-precision robot arm joints and rotary tables
- Aerospace Test Equipment: Precision positioning systems and test rigs requiring exceptional bearing performance
- Medical Equipment: High-speed dental handpieces and surgical tool rotors
