7209 CD/P4ADBAGMM2
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
7209 CD/P4ADBAGMM2 Bearing Product Overview & Core Advantages
The 7209 CD/P4ADBAGMM2 is a precision duplex angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. This metric system bearing features a Back-to-Back (DB) matched arrangement of two bearings, enabling it to withstand combined loads—significant radial loads and axial loads in both directions simultaneously. Its Extra light (Class A) preload ensures minimal deflection and high running accuracy, making it ideal for high-speed and high-precision machinery. The open design, combined with a phenolic cage and precision P4A tolerances, provides superior performance in demanding operational environments.
7209 CD/P4ADBAGMM2 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7209 | Basic bearing series, indicating a 45 mm bore, 85 mm OD, and 38 mm width. |
| C | 15° contact angle, optimized for carrying combined loads. |
| D | Duplex bearing set. |
| P4A | High-precision tolerance class exceeding ABEC 7, ensuring extremely tight dimensional and running accuracy. |
| DB | Back-to-Back arrangement. This configuration provides high rigidity and can accommodate moment loads. |
| A | Extra light preload (Class A), which minimizes friction and heat generation for high-speed operation. |
| GMM | Indicates the specific internal radial clearance and preload selection for the matched set. |
| 2 | Number of bearings in the matched set. |
7209 CD/P4ADBAGMM2 Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex back-to-back (DB) design creates a rigid bearing system that effectively resists overturning moments and supports combined radial and axial loads from both directions. This is critical for maintaining precision under heavy or variable loading conditions.
High-Speed Performance: The phenolic cage is lightweight and possesses excellent sliding properties, reducing centrifugal forces and friction. This, combined with the 15° contact angle and extra light preload, allows the bearing to achieve a high limiting speed of 41,000 rpm with minimal heat generation.
Precision Engineering: Manufactured to P4A tolerance class with extremely tight dimensional tolerances on the bore, outside diameter, and width. This guarantees consistent, high-running accuracy and low vibration levels, which are essential for precision applications.
Durable Construction: Both rings and balls are made from high-quality chrome steel, providing high fatigue resistance and long service life under demanding operating conditions.
7209 CD/P4ADBAGMM2 Bearing Typical Application Areas
The 7209 CD/P4ADBAGMM2 is engineered for high-performance applications where precision, speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Gearboxes: Especially in robotics and high-end automotive transmissions.
- High-Frequency Motors and Spindles: Used in PCB drilling and semiconductor manufacturing equipment.
- Medical Equipment: High-speed centrifuges and dental handpieces.
- Aerospace & Defense: Gyroscopes, radar systems, and other precision guidance systems.
