71904 ACE/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 ACE/P4A Bearing Product Overview & Core Advantages
The 71904 ACE/P4A is a single-row angular contact ball bearing designed for high-precision applications requiring exceptional rotational accuracy and rigidity. Engineered to P4 (ABEC-7) tolerance class, it delivers superior performance in machine tool spindles, precision instruments, and other demanding equipment. Its key advantage lies in its ability to accommodate combined radial and axial loads simultaneously, facilitated by its 25° contact angle. The phenolic cage and optimized internal geometry contribute to its high limiting speed and smooth operation, making it an ideal solution for high-speed, high-rigidity applications.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 71904 | Basic bearing designation (9mm width series, 20mm bore, 37mm OD) |
| ACE | 25° contact angle, optimized internal design |
| P4A | P4 (ABEC-7) tolerance class, with specific running accuracy requirements |
71904 ACE/P4A Bearing Structural Features & Performance Benefits
- High Rigidity & Precision: Manufactured to P4 tolerance standards with precise bore and outside diameter tolerances, ensuring minimal runout and vibration for superior positioning accuracy.
- Optimized Load Capacity: The 25° contact angle enables efficient handling of combined radial and axial loads (dynamic rating: 1053 lbf, static rating: 504 lbf).
- High-Speed Capability: The lightweight phenolic cage and balanced internal design allow for a high limiting speed of 78,000 rpm, reducing centrifugal forces and maintaining stability.
- Preload Availability: Designed to accommodate preload, which increases system stiffness, reduces deflection under load, and enhances rotational accuracy.
- Temperature Stability: Constructed from chrome steel for both rings and balls, with an operating temperature range of -30°C to 110°C, ensuring reliable performance in various environments.
71904 ACE/P4A Bearing Typical Application Areas
- Machine Tool Spindles: High-precision machining centers, grinding spindles
- Precision Instruments: Measuring devices, optical equipment
- High-Speed Motors: Servo motors, spindle motors
- Robotics: Joint and arm mechanisms requiring high accuracy and rigidity
- Medical Equipment: Dental handpieces, laboratory automation
