7221 ACDGB/P4A
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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7221 ACDGB/P4A Bearing Product Overview & Core Advantages
The 7221 ACDGB/P4A is a single-row angular contact ball bearing designed for high-precision applications requiring exceptional rotational accuracy and rigidity. Manufactured to P4A tolerance class, this bearing delivers superior running precision and is universally matchable (SU), allowing for precise preload control when paired with another identical bearing. Its optimized 25° contact angle provides excellent capacity for combined loads, particularly thrust loads in one direction, making it ideal for demanding applications in machine tools and precision equipment.
7221 ACDGB/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 72 | Bearing series, indicating specific internal design and dimensions |
| 21 | Bore diameter code (105 mm) |
| AC | Angular Contact design with 25° contact angle |
| DGB | Universal Matchable bearing, designed for light preload (Class B) when paired |
| P4A | High precision tolerance class with enhanced running accuracy |
7221 ACDGB/P4A Bearing Structural Features & Performance Benefits
Precision Engineering: Manufactured to P4A tolerance class with tight dimensional control (bore and OD tolerance: -0.004mm to 0), ensuring exceptional running accuracy and minimal vibration in high-speed applications.
Optimized Contact Design: The 25° contact angle provides superior thrust load capacity while maintaining good radial load performance, making it ideal for applications with combined loading conditions.
High-Speed Capability: Features a phenolic resin cage that reduces friction and enables stable operation at limiting speeds up to 16,000 rpm, suitable for high-speed spindle applications.
Universal Matching Capability: As a Universal Matchable (SU) bearing, it can be precisely paired with another identical bearing to achieve optimal preload control (Light/Class B) and system rigidity.
Premium Material Construction: Manufactured from chrome steel for both rings and balls, providing excellent durability and fatigue resistance under demanding operating conditions.
7221 ACDGB/P4A Bearing Typical Application Areas
Machine Tool Spindles: High-precision milling, grinding, and turning centers requiring exceptional accuracy and rigidity
Precision Gearboxes: Industrial transmission systems demanding high rotational accuracy and load capacity
High-Speed Motors: Electric motors and spindles operating at elevated speeds with combined loading
Robotics & Automation: Precision joints and positioning systems in industrial robots and automated equipment
Aerospace Components: Critical rotating assemblies in aircraft systems requiring reliable high-speed performance
