71905 ACEGA/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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71905 ACEGA/P4A Bearing Product Overview & Core Advantages
The 71905 ACEGA/P4A is a single-row angular contact ball bearing designed for applications demanding ultra-high precision and exceptional rotational accuracy. Manufactured to P4A tolerance class, this bearing delivers superior running accuracy and dimensional stability. Its 25° contact angle is optimized to handle significant axial loads in one direction while supporting radial loads, making it ideal for high-speed spindles and precision machinery. The bearing comes universally matchable (SU), allowing for precise preload control when mounted in pairs.
71905 ACEGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71905 | Basic bearing designation (25mm bore, 42mm OD, 9mm width) |
| AC | Angular Contact design with 25° contact angle |
| EGA | Extra Light Preload / Class A |
| P4A | Ultra-precision tolerance class for high running accuracy |
71905 ACEGA/P4A Bearing Structural Features & Performance Benefits
High-Precision Construction: Manufactured to P4A tolerance class with extremely tight dimensional tolerances (bore/OD tolerance: -0.004mm to 0), ensuring minimal runout and vibration for superior rotational accuracy.
Optimized Load Capacity: The 25° contact angle provides excellent axial load carrying capacity in one direction while maintaining good radial load performance, with dynamic load rating of 1141 lbf and static load rating of 596 lbf.
High-Speed Performance: Featuring a phenolic resin cage and optimized internal geometry, the bearing achieves exceptional limiting speeds up to 100,500 rpm, making it suitable for high-speed spindle applications.
Precision Matching Capability: Designed as Universal Matchable (SU), these bearings can be precisely paired to achieve optimal preload and stiffness in duplex arrangements.
Premium Material Selection: Constructed from chrome steel for both rings and balls, ensuring high durability and consistent performance under demanding conditions.
71905 ACEGA/P4A Bearing Typical Application Areas
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and precision lathes
- Precision Instrumentation: Measuring equipment, optical instruments, and laboratory devices
- High-Speed Motors: Servo motors, spindle motors, and high-frequency electric motors
- Aerospace Components: Gyroscopes, navigation systems, and aircraft instrumentation
- Medical Equipment: Dental handpieces, surgical tools, and diagnostic imaging systems
