7020 ACD/P4AQBCD
7000 Series Super Precision Angular Contact Ball Bearings
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7020 ACD/P4AQBCD Bearing Product Overview & Core Advantages
The 7020 ACD/P4AQBCD is a precision quadruplex angular contact ball bearing designed for demanding industrial applications requiring exceptional rigidity and load capacity. This metric system bearing features a heavy preload (Class D) and is supplied as a matched set of four bearings in a back-to-back (QBC) arrangement. Its primary advantage lies in its ability to handle significant combined loads (radial and axial) simultaneously while maintaining high rotational accuracy and system stability, making it ideal for high-precision, high-stiffness machinery.
7020 ACD/P4AQBCD Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| ACD | Angular Contact Design with 25° contact angle |
| P4A | High precision tolerance class (superior to ABEC 7) |
| QBC | Quadruplex Back-to-Back matched arrangement |
| D | Heavy preload classification for maximum rigidity |
7020 ACD/P4AQBCD Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The quadruplex back-to-back configuration creates an extremely rigid bearing system capable of withstanding heavy combined loads. With a radial dynamic load rating of 46,800 lbf and static load rating of 72,000 lbf, this bearing delivers exceptional performance under demanding conditions.
Precision Engineering: Manufactured to P4A tolerance class with tight dimensional controls (bore and OD tolerance: -0.004mm to 0), ensuring precise shaft positioning and minimal runout. The 25° contact angle optimizes axial load carrying capacity while maintaining good radial performance.
Advanced Materials: Features chrome steel rings and balls for durability and fatigue resistance, combined with a phenolic cage that provides excellent dimensional stability and reduced friction at limiting speeds up to 16,000 rpm.
Preloaded Configuration: The heavy preload (Class D) eliminates internal clearance, providing immediate response to load changes and minimizing deflection under operation.
7020 ACD/P4AQBCD Bearing Typical Application Areas
- Machine Tool Spindles: High-precision milling, grinding, and turning centers requiring extreme rigidity and accuracy
- Industrial Gearboxes: Heavy-duty transmission systems where combined loads are prevalent
- Precision Positioning Systems: Robotics, automation equipment, and coordinate measuring machines
- High-Speed Machining Centers: Applications demanding both high rotational speeds and substantial load capacity
- Specialized Industrial Machinery: Printing presses, textile machinery, and other equipment requiring precise shaft support
