7209 CDGB/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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7209 CDGB/P4A Bearing Product Overview & Core Advantages
The 7209 CDGB/P4A is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. Engineered to simultaneously handle combined radial and axial loads, this single bearing features a Universal Matchable (SU) design, allowing it to be preloaded in sets for maximum system stiffness. With its P4A super-precision tolerance class and light preload (Class B), it is ideally suited for high-speed spindles and other precision machinery where minimal runout and high reliability are critical.
7209 CDGB/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7209 | Basic bearing series, indicating a metric angular contact ball bearing with 45mm bore, 85mm OD, and 19mm width. |
| CD | Contact angle of 15°, optimized for high-speed operation and axial load capacity. |
| GB | Universal Matchable bearing (SU designation), allowing for flexible mounting arrangements in sets. |
| P4A | Super-precision tolerance class, providing extremely tight dimensional and running accuracy for critical applications. |
7209 CDGB/P4A Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The optimized 15° contact angle and robust construction enable the bearing to support significant combined loads. The Universal Matchable (SU) design allows multiple bearings to be mounted together, creating a highly rigid system that resists deflection under operational stresses.
- Superior High-Speed Performance: The lightweight phenolic resin cage minimizes centrifugal forces, reduces friction, and contributes to a high limiting speed of 41,000 rpm. This makes it an excellent choice for high-speed spindle applications.
- Exceptional Precision: Manufactured to P4A tolerance class, this bearing guarantees minimal radial and axial runout, ensuring smooth, quiet, and accurate rotation essential for precision machining and instrumentation.
- Optimized Material Selection: Constructed from high-grade chrome steel for both rings and balls, the bearing offers high durability, wear resistance, and consistent performance across its specified temperature range (-30°C to 110°C).
7209 CDGB/P4A Bearing Typical Application Areas
The 7209 CDGB/P4A is engineered for high-performance applications where precision and speed are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy rotary axes.
- Medical Equipment: Dental handpieces, centrifuges, and imaging scanner rotors.
- Aerospace & Defense: Gyroscopes, radar systems, and navigation instruments.
- High-Frequency Motors: Spindles for PCB drilling and semiconductor manufacturing equipment.
