71904 CDGA/P4A
71900 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
- Free shipping on orders over $200
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
71904 CDGA/P4A Bearing Product Overview & Core Advantages
The 71904 CDGA/P4A is a super-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and high-speed performance. Manufactured to ABEC 7/P4A tolerance class, this bearing delivers ultra-precise running characteristics. Its 15° contact angle and extra light preload (Class A) configuration make it ideally suited for spindle applications requiring minimal friction and heat generation. The bearing comes pre-lubricated and is universally matchable (SU), allowing for precise axial play adjustment when mounted with a second, identical bearing.
71904 CDGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71904 | Basic bearing series, indicating a super-precision, light series angular contact bearing with 20mm bore, 37mm OD, and 9mm width. |
| C | 15° contact angle design, optimized for high-speed applications with combined loads. |
| D | Two bearings in a universal match (DU) arrangement. |
| GA | Extra light preload (Class A), minimizing friction and heat generation. |
| P4A | ABEC 7/P4A tolerance class, indicating ultra-precision manufacturing standards for high-accuracy applications. |
71904 CDGA/P4A Bearing Structural Features & Performance Benefits
High-Speed Capability: The phenolic resin cage provides excellent dimensional stability and reduced friction at high rotational speeds, supporting the limiting speed of 100,000 rpm. The optimized 15° contact angle reduces heat generation while maintaining stiffness.
Precision Performance: Manufactured to P4A tolerance class with tight dimensional tolerances (bore/OD: -0.004mm to 0), ensuring minimal runout and vibration for superior positioning accuracy.
Load Capacity: With a dynamic load rating of 1361 lbf and static load rating of 720 lbf, this bearing efficiently handles combined radial and axial loads in high-speed applications.
Universal Matching: As a universally matchable (SU) bearing, it can be paired with an identical bearing to create precisely controlled preload arrangements, simplifying installation and optimization.
71904 CDGA/P4A Bearing Typical Application Areas
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and precision lathes
- Precision Instruments: Measuring equipment, optical scanners, and coordinate measuring machines
- High-Speed Motors: CNC spindle motors, dental handpieces, and turbo-molecular pumps
- Aerospace Systems: Gyroscopes, navigation instruments, and auxiliary power units
- Semiconductor Manufacturing: Wafer handling robots, precision positioning stages
