7021 CDGA/P4A
7000 Series Super Precision Angular Contact Ball Bearings
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7021 CDGA/P4A Bearing Product Overview & Core Advantages
The 7021 CDGA/P4A is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and high-speed performance. Manufactured to P4A tolerance class, this bearing delivers superior dimensional stability and running precision. Its 15° contact angle and extra light preload (Class A) configuration make it ideal for handling combined radial and axial loads while maintaining minimal friction and heat generation. The open design with phenolic cage enables optimal lubrication flow, contributing to its high limiting speed of 16,000 rpm.
7021 CDGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7021 | Standard bore diameter (105 mm) and dimension series |
| CDGA | Universal matching bearing with specific preload and clearance |
| P4A | High precision tolerance class exceeding ABEC 7 standards |
7021 CDGA/P4A Bearing Structural Features & Performance Benefits
High Precision Construction: Manufactured to P4A tolerance class with tight dimensional control (bore/OD tolerance: -0.004mm to 0) ensures exceptional running accuracy and minimal vibration.
Optimized Load Capacity: The 15° contact angle design provides excellent capability for handling combined radial and axial loads, with dynamic load rating of 21,510 lbf and static load rating of 21,712 lbf.
High-Speed Performance: The phenolic resin cage and optimized internal geometry contribute to the high limiting speed of 16,000 rpm, reducing centrifugal forces and maintaining stability at elevated speeds.
Universal Matching Capability: Designed as Universal Matchable (SU) bearings, they can be supplied in matched sets of 3 for precise preload control in multi-bearing arrangements.
7021 CDGA/P4A Bearing Typical Application Areas
- Machine tool spindles requiring high precision and rotational accuracy
- High-speed machining centers and precision grinding equipment
- Medical equipment and dental handpieces demanding quiet operation
- Aerospace components and instrumentation requiring reliable performance
- Robotic systems and automation equipment needing precise motion control
