71907 ACD/P4ADGA
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 71907 ACD/P4ADGA is a precision angular contact ball bearing designed for applications requiring exceptional rotational accuracy and high-speed performance. As a universal matchable (SU) bearing supplied in a pre-loaded pair, it delivers superior rigidity and stability under combined loads. Manufactured to P4A tolerance class with an extra light preload (Class A), this bearing is engineered for high-reliability applications where minimal deflection and precise shaft positioning are critical.
71907 ACD/P4ADGA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71907 | Basic bearing designation (35mm bore, 55mm OD, 20mm width) |
| AC | Angular Contact design with 25° contact angle |
| D | High precision bearing with optimized internal geometry |
| P4A | Tolerance class P4A for ultra-precision applications |
| DGA | Universal matchable pair with extra light preload (Class A) |
Structural Features and Performance Benefits
High Precision Construction: Manufactured to P4A tolerance standards with bore diameter tolerance of -0.004mm to 0 and outside diameter tolerance of -0.004mm to 0, ensuring exceptional running accuracy and minimal vibration.
Optimized Load Capacity: The 25° contact angle and universal matching design enable efficient handling of combined radial and axial loads in either direction when used in pairs.
High-Speed Performance: The phenolic cage and precision-ground chrome steel components contribute to stable operation at limiting speeds up to 56,000 rpm.
Pre-Configured Performance: Supplied as a matched set of 2 bearings with extra light preload, eliminating the need for complex mounting adjustments while ensuring optimal bearing rigidity and system stability.
71907 ACD/P4ADGA Bearing Typical Application Areas
Machine Tool Spindles: High-speed machining centers and precision grinding spindles requiring exceptional rotational accuracy
Precision Instrumentation: Measuring equipment, optical systems, and laboratory instruments demanding minimal runout
High-Speed Automation: Robotics, CNC systems, and automated manufacturing equipment requiring reliable high-speed operation
Aerospace Components: Guidance systems, flight control mechanisms, and auxiliary power units where precision and reliability are critical
