71920 CBGA/P4A
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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71920 CBGA/P4A Bearing Product Overview & Core Advantages
The 71920 CBGA/P4A is a super-precision angular contact ball bearing designed for the most demanding high-speed and high-rigidity applications. As a single bearing in a Universal Matchable (SU) set, it offers exceptional running accuracy and performance consistency. Its key advantages include the ability to accommodate combined radial and axial loads simultaneously, superior dimensional stability with P4A tolerance class, and optimized high-speed performance facilitated by its phenolic cage and factory-applied lubrication. This bearing is engineered for machine tool spindles and other precision equipment where uncompromising accuracy and reliability are paramount.
71920 CBGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71920 | Basic bearing series and size designation (100mm bore, 140mm OD, 20mm width) |
| C | 15° contact angle, optimized for high-speed operation |
| B | 40° bearing ring construction |
| GA | Extra light preload (Class A) |
| P4A | Super-precision tolerance class, exceeding ABEC 7/ISO P4 standards |
71920 CBGA/P4A Bearing Structural Features & Performance Benefits
- High Rigidity & Precision: Manufactured to P4A tolerance class with extremely tight dimensional controls (bore/OD tolerance: -0.004mm to 0), ensuring minimal runout and vibration for superior rotational accuracy.
- Optimized Load Capacity: The 15° contact angle and 37-ball configuration provide excellent capacity for combined radial and axial loads (dynamic: 4860 lbf, static: 5040 lbf).
- Superior High-Speed Performance: The phenolic cage offers low mass and excellent sliding properties, contributing to the high limiting speed of 16,000 rpm while maintaining dimensional stability.
- Precision Matching Capability: As a Universal Matchable (SU) bearing, it can be paired with another identical bearing to form a pre-adjusted set, simplifying installation and ensuring optimal preload performance.
- Premium Materials: Constructed from chrome steel for rings and balls, providing high hardness, wear resistance, and long service life in precision applications.
71920 CBGA/P4A Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning centers requiring super-precision and thermal stability
- Precision Robotics: High-accuracy robotic arms and CNC machinery
- Aerospace Equipment: Gyroscopes, navigation systems, and auxiliary power units
- Medical Equipment: High-speed dental handpieces and surgical tools
- Test & Measurement Instruments: Coordinate measuring machines and optical inspection equipment
