7021 ACDGC/P4AL
7000 Series Super Precision Angular Contact Ball Bearings
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Main Dimensions
Ball & Washer Dimensions
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7021 ACDGC/P4AL Bearing Product Overview & Core Advantages
The 7021 ACDGC/P4AL is a high-precision angular contact ball bearing designed for applications demanding exceptional rigidity and running accuracy. Engineered to accommodate combined loads (radial and axial loads simultaneously), this bearing features a 25° contact angle and P4A super-precision tolerance class, making it ideal for high-speed spindles and precision machinery. Its moderate preload (Class C) ensures optimal stiffness and rotational accuracy right from installation, while the universal matching (SU) design allows for flexible mounting arrangements in sets.
7021 ACDGC/P4AL Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning | Performance Benefit |
|---|---|---|
| AC | Angular Contact Design | Optimized for combined radial and axial loads |
| DGC | Duplex Ground & Universal Match | Precision ground for universal pairing in any configuration |
| P4A | Super Precision Tolerance Class | Exceptional running accuracy and dimensional stability |
| L | Light Preload | Enhanced rigidity without excessive friction |
7021 ACDGC/P4AL Bearing Structural Features & Performance Benefits
High Rigidity & Precision: The 25° contact angle and moderate preload provide superior system stiffness, minimizing deflection under load while maintaining precise rotational characteristics. Manufactured to P4A tolerance class, this bearing ensures minimal runout and vibration.
Optimized Load Capacity: With a dynamic load rating of 20,340 lbf and static load rating of 20,925 lbf, the 7021 ACDGC/P4AL delivers reliable performance under significant combined loads. The 21 high-precision chrome steel balls are precisely arranged to distribute loads evenly.
High-Speed Capability: The phenolic resin cage provides excellent guidance at high speeds while reducing friction and weight. Combined with proper lubrication, this enables operation at limiting speeds up to 16,000 rpm.
Thermal Stability: The phenolic cage material offers good dimensional stability across the operating temperature range of -30°C to 110°C, ensuring consistent performance in varying thermal conditions.
7021 ACDGC/P4AL Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning centers requiring precision and rigidity
- Precision Instrumentation: Measuring equipment, optical systems, and laboratory apparatus
- High-Speed Automation: Robotics, CNC machinery, and precision positioning systems
- Aerospace Components: Gyroscopes, navigation systems, and aircraft instrumentation
- Medical Equipment: Dental handpieces, surgical tools, and diagnostic imaging systems
