71809 CD/P4DGAGMM2
71800 Series Super Precision Angular Contact Ball Bearings
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71809 CD/P4DGAGMM2 Bearing Product Overview & Core Advantages
The 71809 CD/P4DGAGMM2 is a super-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and high-speed performance. As a universally matchable (SU) bearing supplied in a pre-set duplex pair, it is engineered to accommodate combined loads (radial and axial) simultaneously. Its P4 tolerance class ensures ultra-precision operation, while the phenolic cage and optimized internal geometry contribute to superior high-speed capability and high rigidity. This configuration is ideal for compact, high-performance spindles and other precision machinery.
71809 CD/P4DGAGMM2 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71809 | Basic bearing designation, indicating a super-precision, light series angular contact ball bearing with a 45 mm bore. |
| C | 15° contact angle. |
| D | The bearing is part of a universally matchable (SU) duplex pair. |
| P4 | Indicates a high-precision tolerance class, superior to ABEC-7. |
| DG | Duplex arrangement: Back-to-Back (DB) mounting. |
| A | Extra light preload class. |
| G | Pre-greased. |
| MM | The bearing rings are stabilized for continuous operation at temperatures up to 110°C. |
| 2 | Number of bearings in the matched set. |
71809 CD/P4DGAGMM2 Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The back-to-back (DB) duplex arrangement creates a wide effective spread, significantly increasing the moment stiffness and enabling the bearing set to handle substantial combined radial and axial loads from both directions.
Superior High-Speed Performance: The lightweight phenolic resin cage minimizes centrifugal forces and ensures excellent dimensional stability at high speeds, contributing to the high limiting speed of 46,000 rpm. The optimized internal geometry with a 15° contact angle further enhances high-speed operation.
Precision & Reliability: Manufactured to P4 tolerance class with a bore and outside diameter tolerance of -0.004mm to 0, this bearing guarantees extremely low runout and smooth, precise rotation, which is critical for applications like machine tool spindles.
Ready-to-Install & Matched Set: Supplied as a pre-configured, pre-greased, and pre-loaded duplex pair (Universal Matchable SU), this bearing simplifies installation, ensures optimal performance, and eliminates the need for selective mounting.
71809 CD/P4DGAGMM2 Bearing Typical Application Areas
The 71809 CD/P4DGAGMM2 is ideally suited for high-precision, high-speed rotational systems, including:
- Machine Tool Spindles (e.g., for milling, grinding, and drilling)
- High-Frequency Motors
- Precision Grinding Spindles
- Robotic Drives and Actuators
- Aerospace Control Systems
- Medical and Dental Handpiece Drives
