71904 CD/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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71904 CD/P4A Bearing Product Overview & Core Advantages
The 71904 CD/P4A is a single-row angular contact ball bearing engineered for high-precision applications requiring exceptional rotational accuracy and rigidity. Manufactured to P4 (ABEC-7) tolerance class, this bearing is designed to accommodate primarily axial loads in one direction and combined loads. Its compact cross-section, with a 20 mm bore and 9 mm width, makes it ideal for space-constrained, high-speed spindle arrangements. The phenolic cage and optimized 15° contact angle contribute to superior high-speed performance and operational stability.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 71904 | Bearing series and size designation (9mm width, 20mm bore) |
| C | 15° contact angle design |
| D | Enhanced internal design for higher load capacity |
| P4A | P4 (ABEC-7) tolerance class with specific running accuracy requirements |
71904 CD/P4A Bearing Structural Features & Performance Benefits
High Precision & Rigidity: The single-row angular contact design, combined with P4 tolerance class manufacturing, ensures minimal runout and vibration for precise shaft positioning. The phenolic resin cage provides excellent dimensional stability at high speeds.
Superior Load Capacity: With a 15° contact angle and optimized internal geometry, this bearing efficiently handles high axial loads in one direction and combined (radial and axial) loads. The dynamic load rating of 1361 lbf and static load rating of 720 lbf make it suitable for demanding applications.
High-Speed Performance: The lightweight phenolic cage and precision-ground chrome steel components enable a limiting speed of 67,000 rpm. The open design allows for efficient lubrication management in high-speed systems.
Pre-Lubricated & Ready-to-Use: The bearing comes pre-lubricated for immediate installation and initial operation, suitable for a temperature range of -30°C to 110°C.
71904 CD/P4A Bearing Typical Application Areas
The 71904 CD/P4A is ideally suited for high-precision, high-speed machinery including:
- Machine Tool Spindles - for CNC machining centers and grinding spindles
- Precision Instrumentation - in measuring devices and optical equipment
- High-Speed Motors - for robotics and automation systems
- Medical Equipment - in dental handpieces and laboratory instruments
- Aerospace Components - for guidance systems and auxiliary power units
