71904 ACEGB/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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71904 ACEGB/P4A Bearing Product Overview & Core Advantages
The 71904 ACEGB/P4A is a super-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and high-speed performance. As a single bearing in a universally matchable (SU) set, it excels in handling combined loads—simultaneously supporting significant radial loads and thrust loads in one direction. Its P4A tolerance class ensures ultra-precise dimensions and running accuracy, making it ideal for high-rigidity, high-reliability spindle arrangements and precision machinery.
71904 ACEGB/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. |
| AC | Angular Contact design with a 25° contact angle. |
| E | Optimized internal design for enhanced load capacity and speed performance. |
| GB | Light preload (Class B) applied for reduced noise and vibration, ensuring stable operation. |
| P4A | Super-precision tolerance class, exceeding ABEC 7 standards for exceptional running accuracy. |
71904 ACEGB/P4A Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The optimized internal geometry, including a 25° contact angle and 14 high-precision chrome steel balls, provides excellent resistance to deformation under combined radial and axial loads. The phenolic cage ensures stable ball guidance.
Superior High-Speed Performance: The lightweight phenolic cage and precision-ground raceways contribute to low friction and heat generation, enabling a high limiting speed of 75,000 rpm. The bearing is pre-lubricated for immediate operation.
Precision Engineering: Manufactured to P4A tolerance class, this bearing guarantees minimal runout and superior dimensional stability, which is critical for applications requiring high positional accuracy.
Universal Matchability (SU): As a universally matchable bearing, it can be paired with another identical bearing in a back-to-back (DB) or face-to-face (DF) arrangement to support bidirectional axial loads, offering great flexibility in spindle design.
71904 ACEGB/P4A Bearing Typical Application Areas
- High-Frequency Machine Tool Spindles
- Precision Grinding Spindles
- High-Speed CNC Machining Centers
- PCB Drilling & Milling Spindles
- Precision Instrumentation & Measuring Devices
