7221 CDGB/P4A
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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Materials
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7221 CDGB/P4A Bearing Product Overview & Core Advantages
The 7221 CDGB/P4A is a single-row angular contact ball bearing engineered for high-precision applications demanding exceptional rotational accuracy and rigidity. Designed to accommodate primarily axial loads in one direction and combined loads, this bearing features a 15° contact angle and Universal Matchable (SU) designation, allowing for precise preload control when mounted in pairs. Manufactured to P4A tolerance class, it delivers superior running accuracy and is pre-lubricated for immediate operation. Its compact design and high rigidity make it ideal for machine tool spindles and other high-performance rotational systems.
7221 CDGB/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7221 | Basic bearing designation: 105 mm bore, 190 mm OD, 36 mm width |
| CD | High contact angle (15°) design for increased axial load capacity |
| GB | Universal Matchable bearing for paired mounting with controlled preload |
| P4A | High precision tolerance class with enhanced dimensional and running accuracy |
7221 CDGB/P4A Bearing Structural Features & Performance Benefits
Optimized Internal Geometry: The 15° contact angle and precision-ground raceways provide excellent axial load capacity while maintaining good radial load performance, making it suitable for combined loads.
High-Speed Capability: The phenolic resin cage ensures low friction and excellent dimensional stability at high speeds, contributing to the bearing's limiting speed of 16,000 rpm.
Precision Engineering: Manufactured to P4A tolerance class with tight dimensional controls (bore/OD tolerance: -0.004mm to 0), ensuring minimal runout and vibration for high-precision applications.
Universal Matching Design: As a Universal Matchable (SU) bearing, it can be mounted in pairs (back-to-back, face-to-face, or tandem) to achieve specific preload conditions (Light / Class B preload) for optimal system stiffness.
Premium Material Construction: Chrome steel rings and balls provide high wear resistance and durability, while the phenolic cage offers excellent performance in high-speed applications.
7221 CDGB/P4A Bearing Typical Application Areas
- Machine Tool Spindles: High-precision machining centers, grinding spindles, and milling applications
- Precision Gearboxes: Industrial transmission systems requiring high accuracy and reliability
- High-Speed Motors: Electric motors and generators operating at elevated speeds
- Aerospace Components: Aircraft auxiliary systems and precision mechanisms
- Medical Equipment: High-speed dental handpieces and surgical tools
- Robotics: Precision joints and rotary actuators demanding high rigidity and accuracy
