71920 ACD/P4ALDGA
71900 Series Super Precision Angular Contact Ball Bearings
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71920 ACD/P4ALDGA Bearing Product Overview & Core Advantages
The 71920 ACD/P4ALDGA is a precision angular contact ball bearing designed for applications demanding exceptional accuracy and reliability. This universal matchable bearing features an Extra Light (Class A) preload and P4A tolerance class, making it ideal for high-speed spindles and precision machinery. Its 25° contact angle provides superior combined load capacity, effectively handling both radial and axial loads simultaneously. The open design with phenolic cage enables high-speed operation up to 15,000 rpm while maintaining dimensional stability and high rigidity.
Model Code Detailed Explanation
| Code Segment | Technical Meaning |
|---|---|
| 71920 | Basic bearing designation with 100mm bore, 140mm OD, 40mm width |
| ACD | Angular Contact, 25° contact angle, universal matching design |
| P4A | High precision tolerance class with specific running accuracy requirements |
| LDGA | Light preload (Class A) for minimal deflection and high precision |
71920 ACD/P4ALDGA Bearing Structural Features & Performance Benefits
Precision Engineering: Manufactured to P4A tolerance class with bore and outside diameter tolerances of -0.004mm to 0, ensuring exceptional running accuracy and dimensional stability.
High-Speed Capability: The phenolic cage material and optimized internal geometry enable stable operation at limiting speeds of 15,000 rpm, making it suitable for high-speed spindle applications.
Superior Load Capacity: With radial dynamic load rating of 20,768 lbf and static load rating of 28,125 lbf, this bearing delivers reliable performance under combined loading conditions.
Universal Matching Design: As a Universal Matchable (SU) bearing, it can be paired with identical bearings in various configurations (DB, DF, DT) without selective matching, simplifying installation and maintenance.
Thermal Stability: The phenolic cage and chrome steel construction maintain performance across a temperature range of -30°C to 110°C.
71920 ACD/P4ALDGA Bearing Typical Application Areas
- Machine Tool Spindles - High-speed machining centers and precision grinding machines
- Precision Instrumentation - Measuring equipment and laboratory instruments requiring high accuracy
- High-Speed Motors - Spindle motors and servo drives demanding minimal runout
- Medical Equipment - Dental handpieces and surgical tools requiring precision and reliability
- Aerospace Components - Guidance systems and precision actuators
- Robotics - High-precision joints and positioning systems
