71907 ACD/P4AQGB
71900 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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Materials
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71907 ACD/P4AQGB Bearing Product Overview & Core Advantages
The 71907 ACD/P4AQGB is a super-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. As a universally matchable (SU) bearing with P4A tolerance class, it enables high-precision preload arrangements without selective sorting. Its 25° contact angle and phenolic cage are optimized for high-speed operation while maintaining stability under combined radial and axial loads. This bearing comes pre-lubricated and is engineered for rigid machine tool spindles and other precision equipment requiring uncompromising performance.
71907 ACD/P4AQGB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Performance Benefit |
|---|---|---|
| 71907 | Basic bearing series designation | High-speed angular contact design |
| ACD | 25° contact angle, universal matchable | Enables flexible bearing arrangements without selective matching |
| P4A | Super precision tolerance class | Exceptional running accuracy and minimal vibration |
| QGB | Special technical specification group | Enhanced performance characteristics for precision applications |
71907 ACD/P4AQGB Bearing Structural Features & Performance Benefits
High-Speed Capability: The phenolic resin cage provides excellent strength-to-weight ratio, reducing centrifugal forces and enabling operation at 56,000 rpm limiting speed. The optimized 25° contact angle balances axial and radial load capacity while maintaining high-speed stability.
Precision Performance: Manufactured to P4A tolerance class with bore and outside diameter tolerances of -0.004mm to 0, ensuring precise fit and minimal runout. The universal matchable design allows for flexible mounting arrangements in duplex, triplex, or quadruplex configurations without selective matching.
Load Capacity & Rigidity: With 21 precision balls of 5.556mm diameter, the bearing achieves a dynamic load rating of 5,445 lbf and static load rating of 5,512 lbf. The angular contact design provides high rigidity against moment loads and combined loading conditions.
Material Excellence: Constructed from chrome steel for both rings and balls, ensuring dimensional stability and long service life. The open design allows for customized lubrication schemes while the phenolic cage operates effectively within the -30°C to 110°C temperature range.
71907 ACD/P4AQGB Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning spindles requiring P4A precision
- Precision Instrumentation: Measuring equipment, optical scanners, and coordinate measuring machines
- High-Speed Automation: Industrial robots, pick-and-place systems, and assembly automation
- Aerospace Components: Gyroscopes, navigation systems, and aircraft instrumentation
- Medical Equipment: Dental handpieces, laboratory centrifuges, and diagnostic imaging systems
