S7211 CDGA/P4A
Sealed Super Precision Angular Contact Ball Bearings
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S7211 CDGA/P4A Bearing Product Overview & Core Advantages
The S7211 CDGA/P4A is a high-precision double row angular contact ball bearing engineered for demanding applications requiring exceptional accuracy and reliability. This sealed bearing is designed to accommodate combined loads—simultaneously handling significant radial loads and bidirectional axial loads. Its compact design, featuring two rows of balls and a phenolic cage, provides high rigidity and stable operation. Manufactured to the stringent P4A tolerance class, it delivers superior running accuracy, making it an ideal choice for high-speed spindles and other precision machinery where minimal runout and vibration are critical.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| S | Silicon Nitride (Si3N4) Ceramic Balls |
| 7211 | Basic bearing designation (55mm bore, 100mm OD, 21mm width) |
| CD | 15° contact angle and optimized internal geometry |
| G | Sealed on both sides |
| A | Extra light preload |
| P4A | High precision tolerance class (superior to ABEC 7) |
S7211 CDGA/P4A Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The double row design provides superior radial and axial rigidity, enabling the bearing to withstand combined loads effectively. With a 15° contact angle, it efficiently manages bidirectional axial loads.
High-Speed Performance: The lightweight phenolic cage and the use of ceramic balls significantly reduce centrifugal forces, allowing for a high limiting speed of 39,000 rpm. This makes it an excellent high-speed bearing.
Precision & Longevity: Manufactured to P4A tolerances, it ensures minimal vibration and high running accuracy. The integral seals protect against contamination, and the pre-applied grease lubrication ensures consistent performance, contributing to a long service life with minimal maintenance.
Universal Matching: Designed as a Universal Matchable (SU) bearing, it can be mounted in various preload configurations (back-to-back, face-to-face, or tandem) with other bearings from the same manufacturing lot, providing design flexibility for complex spindle arrangements.
S7211 CDGA/P4A Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling, engraving machines, and high-frequency motors.
- Robotics: High-accuracy joints and rotary actuators.
- Aerospace & Defense: Gyroscopes, radar systems, and other precision instrumentation.
- Medical Equipment: Dental handpieces and high-speed surgical tools.
