71908 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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Product Overview and Core Advantages
The 71908 FEGA/P4A is a single-row angular contact ball bearing designed for applications requiring ultra-high precision and exceptional rotational accuracy. Positioned in the P4A tolerance class, this bearing delivers superior dimensional stability and running accuracy. Its 18° 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 pre-lubricated and features an open seal design, allowing for customized lubrication solutions in clean environments.
71908 FEGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71908 | Basic bearing designation indicating size series (719) and bore diameter (08 = 40mm) |
| FE | Steel phenolic cage design for high-speed performance |
| GA | Universal matching designation allowing for precise bearing arrangement in sets |
| P4A | Ultra-precision tolerance class with enhanced dimensional and running accuracy |
Structural Features and Performance Benefits
High-Precision Design: Manufactured to P4A tolerance standards with extremely tight dimensional tolerances (bore: -0.004mm to 0, OD: -0.004mm to 0) ensuring minimal runout and vibration.
Optimized Contact Angle: The 18° contact angle provides excellent axial load capacity while maintaining good radial load performance, suitable for combined loading applications.
High-Speed Capability: The phenolic cage material and optimized internal geometry enable operation at limiting speeds of 41,000 rpm, making it ideal for high-speed spindle applications.
Universal Matching: Designed as Universal Matchable (SU), allowing for precise preload control when used in matched sets of 2 bearings with extra light preload (Class A).
Premium Materials: Constructed from chrome steel for both rings and balls, providing excellent wear resistance and durability under high-stress conditions.
71908 FEGA/P4A Bearing Typical Application Areas
- Machine Tool Spindles: High-precision milling, grinding, and turning centers requiring ultra-precision bearings
- High-Speed Machining Centers: Applications demanding exceptional rotational accuracy at elevated speeds
- Precision Instrumentation: Measuring equipment and laboratory instruments requiring minimal vibration
- Medical Equipment: High-speed dental handpieces and surgical tools
- Aerospace Components: Guidance systems and precision actuators
