71904 CDGB/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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71904 CDGB/P4A Bearing Product Overview & Core Advantages
The 71904 CDGB/P4A is a super-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and high-speed performance. As a single bearing with a 15° contact angle and Universal Matchable (SU) designation, it is engineered to handle combined loads—primarily thrust loads with radial load components. Its P4A tolerance class ensures ultra-precise dimensions and running accuracy, making it ideal for high-rigidity, high-reliability spindles and precision machinery. The phenolic cage and optimized internal geometry contribute to its superior high-speed capabilities and smooth operation.
71904 CDGB/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71904 | Basic bearing series, indicating a super-precision, light-weight angular contact design with a 20mm bore. |
| C | Specifies a 15° contact angle, optimized for high-speed operation and moderate thrust capacity. |
| DGB | Indicates a Light preload (Class B) applied. This preload eliminates internal clearance, enhancing system rigidity and rotational accuracy. |
| P4A | Denotes an ultra-high precision tolerance class, with extremely tight limits on bore, outside diameter, and width tolerances for superior running performance. |
71904 CDGB/P4A Bearing Structural Features & Performance Benefits
- High Rigidity & Precision: The light preload (DGB) and P4A tolerance class work in tandem to provide exceptional system stiffness and minimize runout, which is critical for machining accuracy and surface finish.
- Optimized for High Speeds: The phenolic resin cage offers low weight, high strength, and excellent sliding properties, enabling stable operation at the high limiting speed of 100,000 rpm. The open design facilitates efficient lubrication and cooling.
- Superior Load Capacity: The 15° contact angle and high-grade chrome steel construction provide a robust dynamic load rating of 1361 lbf, effectively handling combined radial and axial loads.
- Universal Matching Capability (SU): This bearing is manufactured to universal matching standards, allowing any two bearings to be paired in a back-to-back (DB) or face-to-face (DF) arrangement without selective matching, simplifying installation and inventory.
71904 CDGB/P4A Bearing Typical Application Areas
The 71904 CDGB/P4A is engineered for the most demanding high-speed and high-precision applications, including:
- Machine Tool Spindles: High-frequency milling, grinding, and turning spindles.
- Precision Robotics: High-accuracy joints and arm assemblies.
- High-Speed Motors & Drives: Spindles for PCB drilling and semiconductor manufacturing equipment.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and navigation instruments.
