71905 FEGA/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 FEGA/P4A Bearing Product Overview & Core Advantages
The 71905 FEGA/P4A is a single-row angular contact ball bearing designed for high-precision applications requiring exceptional rotational accuracy and speed capability. Manufactured to P4A tolerance class, this bearing delivers superior running accuracy and dimensional stability. Its 18° contact angle is optimized for handling combined loads, particularly thrust loads in one direction, while maintaining high-speed performance up to 71,500 rpm. The phenolic cage and universal matching capability make it ideal for precision spindle arrangements.
71905 FEGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71905 | Basic bearing designation indicating size series 19 and 05 bore size (25mm) |
| F | Machined brass cage (specific to this precision series) |
| E | Optimized internal design for improved performance |
| GA | Light preload classification for precise positioning |
| P4A | High precision tolerance class with enhanced running accuracy |
71905 FEGA/P4A Bearing Structural Features & Performance Benefits
High Precision Construction: Manufactured to P4A tolerance class with tight dimensional control (bore and OD tolerance: -0.004mm to 0) ensuring minimal runout and vibration.
Optimized Internal Geometry: Features 16 precision balls of 4.762mm diameter with an 18° contact angle, providing excellent combined load capacity and axial rigidity.
Superior High-Speed Performance: The phenolic resin cage enables high-speed operation up to 71,500 rpm while reducing friction and heat generation.
Universal Matching Capability: Designated as Universal Matchable (SU), allowing precise pairing of two bearings to achieve optimal preload and stiffness in spindle applications.
Premium Material Selection: Chrome steel rings and balls combined with phenolic cage ensure long service life and reliable performance in demanding conditions.
71905 FEGA/P4A Bearing Typical Application Areas
- Machine Tool Spindles: High-precision machining centers, grinding spindles, and CNC milling machines
- Precision Instrumentation: Measuring equipment, optical instruments, and laboratory apparatus
- High-Speed Motors: Spindle motors, high-frequency motors, and precision drive systems
- Aerospace Components: Gyroscopes, navigation systems, and aircraft instrumentation
- Medical Equipment: Dental handpieces, surgical tools, and diagnostic imaging systems
