71904 ACEGA/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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Main Dimensions
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71904 ACEGA/P4A Bearing Product Overview & Core Advantages
The 71904 ACEGA/P4A is a single-row angular contact ball bearing designed for ultra-precision applications requiring exceptional rotational accuracy and high-speed performance. Manufactured to P4A tolerance class, this bearing delivers superior dimensional stability and running accuracy. Its key advantage lies in its ability to handle combined loads—significant radial loads and axial loads in one direction—making it ideal for compact, high-precision spindle arrangements. The extra light preload (Class A) minimizes deflection under light loads, ensuring smooth operation and enhanced positional accuracy.
71904 ACEGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71904 | Basic bearing series and size designation (9mm width, 20mm bore, 37mm OD) |
| AC | Angular Contact design with a 25° contact angle |
| EGA | Universal Matchable (SU) bearing set, consisting of 2 bearings pre-adjusted for extra light preload (Class A) |
| P4A | High precision tolerance class (superior to ABEC-7), ensuring minimal runout and vibration |
71904 ACEGA/P4A Bearing Structural Features & Performance Benefits
- High-Speed Capability: The phenolic resin cage offers excellent strength-to-weight ratio and reduced friction, contributing to the high limiting speed of 75,000 rpm. This makes it suitable for demanding high-speed spindle applications.
- Precision & Rigidity: Manufactured to P4A tolerances with a 25° contact angle, this bearing provides high rigidity and precise running accuracy, which is critical for machine tool spindles.
- Optimized Load Capacity: The design is optimized to carry combined radial and axial loads efficiently. The dynamic radial load rating of 1053 lbf and static radial load rating of 504 lbf ensure reliable performance under load.
- Universal Matching (SU): As part of an EGA set, these bearings are universally matchable. This simplifies mounting and ensures optimal preload and performance when used in pairs, typically in back-to-back (DB) or face-to-face (DF) arrangements.
- Material Quality: Constructed from chrome steel for both rings and balls, ensuring high durability, wear resistance, and consistent performance within a temperature range of -30°C to 110°C.
71904 ACEGA/P4A Bearing Typical Application Areas
The 71904 ACEGA/P4A is engineered for high-performance applications where precision and speed are paramount. Its primary uses include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Instrumentation: Measuring devices and laboratory equipment.
- High-Speed Motors: Spindles for PCB drilling and small precision motors.
- Robotics: High-accuracy joints and arm assemblies.
