71920 CD/P4ADBC
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 71920 CD/P4ADBC is a precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. As part of a matched duplex set in a back-to-back (DB) arrangement, this bearing is engineered to handle combined loads—significant radial loads and axial loads in both directions simultaneously. Its P4A tolerance class ensures ultra-precise dimensions and running accuracy, making it ideal for high-speed spindles and other high-rigidity applications where minimal deflection is critical.
71920 CD/P4ADBC Bearing Model Code Explained, Specifications & Naming Convention
- 71920: Basic model number denoting a 100mm bore, 140mm OD, 40mm width angular contact bearing
- C: Contact angle of 15 degrees
- D: Indicates the bearing is one of a duplex pair
- P4A: Super-precision tolerance class with enhanced width tolerance and running accuracy
- DB: Duplex Back-to-Back arrangement for maximum rigidity and moment load capacity
- C: Moderate preload (Class C) for optimal stiffness and positioning accuracy
Structural Features and Performance Benefits
The 71920 CD/P4ADBC achieves superior performance through its optimized design: High Rigidity is accomplished through the back-to-back duplex configuration, which provides substantial resistance to moment loads and shaft deflection. The 15-degree contact angle offers an excellent balance between radial and axial load capacity. The phenolic resin cage ensures smooth operation at high speeds up to 16,000 rpm while reducing friction and heat generation. With chrome steel construction throughout and factory lubrication, this bearing delivers reliable performance across a wide temperature range from -30°C to 110°C. The moderate preload eliminates internal clearance, providing immediate response and enhanced system stiffness.
71920 CD/P4ADBC Bearing Typical Application Areas
This precision bearing is specifically engineered for applications requiring exceptional accuracy and stiffness, including: Machine tool spindles, high-speed machining centers, precision grinding spindles, industrial pumps and compressors, robotic positioning systems, and aerospace positioning mechanisms. Its combination of high-speed capability, superior rigidity, and precision tolerances makes it particularly suitable for CNC machining applications where dimensional stability and minimal runout are paramount.
