71809 CD/P4DGA
71800 Series Super Precision Angular Contact Ball Bearings
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71809 CD/P4DGA Bearing Product Overview & Core Advantages
The 71809 CD/P4DGA is a super-precision angular contact ball bearing designed for applications demanding the highest levels of rotational accuracy and rigidity. Operating under the P4 tolerance class, it delivers exceptional running precision. Its Universal Matchable (SU) design allows two bearings to be paired in a universal arrangement, simplifying installation and ensuring optimal preload for superior system stiffness. This bearing is engineered to handle combined loads efficiently, making it an ideal choice for high-performance, high-speed machinery.
71809 CD/P4DGA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71809 | Basic bearing designation, indicating a metric series super-precision angular contact ball bearing with a 45 mm bore. |
| CD | Indicates a 15° contact angle and that the bearing is supplied as one of a pair in a Universal Matchable (SU) duplex set. |
| P4 | Denotes the tolerance class, signifying very high precision levels for runout and dimensional accuracy. |
| DGA | Indicates the bearing is lubricated and features a phenolic cage, which is ideal for high-speed operation. |
71809 CD/P4DGA Bearing Structural Features & Performance Benefits
High Rigidity & Precision: The angular contact design and Universal Match (SU) pairing enable the bearing system to achieve extremely high rigidity, essential for minimizing deflection under load in precision applications. Manufactured to P4 tolerance, it ensures exceptional running accuracy.
Optimized for High Speeds: The lightweight phenolic cage minimizes centrifugal forces, contributing to a high limiting speed of 46,000 rpm. The standard lubrication further supports reliable operation at these elevated speeds.
Superior Load Capacity: With a 15° contact angle, this bearing is engineered to support significant combined radial and axial loads simultaneously, a critical requirement in complex load scenarios.
Matched Set Simplicity: The Universal Matchable (SU) feature ensures that any two CD-prefixed bearings can be mounted together face-to-face or back-to-back to achieve a pre-defined Extra light preload, guaranteeing consistent performance without complex selection processes.
71809 CD/P4DGA Bearing Typical Application Areas
The 71809 CD/P4DGA is ideally suited for high-precision, high-speed machinery where accuracy and rigidity are paramount. Key application areas include:
- Machine Tool Spindles: For milling, grinding, and turning centers requiring ultra-precision.
- High-Frequency Spindles: Used in PCB drilling and precision engraving.
- Precision Instrumentation: Critical components in measuring and testing equipment.
- Robotic Arms & CNC Rotary Tables: Where high positional accuracy and dynamic stiffness are required.
