71920 CD/P4ADBB
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71920 CD/P4ADBB
Basic Information
System of measurement
Metric
Weight
1.6 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
100 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
140 mm
Outside diameter tolerance
-0.004mm to 0
Width
40 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
12.7 mm
Ball quantity
26
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
21938 lbf
Radial static load rating
29700 lbf
Limiting speed
16 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Duplex Back-to-Back (DB)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
Preload
Light / Class B
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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In Stock
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71920 CD/P4ADBB Bearing Product Overview & Core Advantages
The 71920 CD/P4ADBB is a precision duplex angular contact ball bearing configured in a back-to-back (DB) arrangement. This high-precision bearing is engineered to simultaneously handle combined radial and axial loads with exceptional accuracy and rigidity. Manufactured to the stringent P4A tolerance class, it is preloaded for light operational conditions (Class B), ensuring minimal deflection and superior running accuracy. Its compact design and high load capacity make it an ideal solution for demanding, high-speed applications requiring maximum stiffness and precision.
71920 CD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71920 | Basic bearing series and size designation. |
| C | Specifies a 15° contact angle, optimized for high-speed operation and moderate axial load capacity. |
| D | Indicates the bearing is part of a duplex pair. |
| P4A | Denotes an ultra-high precision tolerance class, exceeding ABEC 7/ISO P4 standards, for applications requiring extreme running accuracy. |
| DB | Signifies the back-to-back duplex arrangement, which provides high moment rigidity and excellent stability under complex loading conditions. |
71920 CD/P4ADBB Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The duplex back-to-back (DB) configuration creates a widely spaced load zone, significantly increasing the system's resistance to moment loads and providing exceptional operational stiffness.
- Superior Load Capacity: Designed to carry combined loads efficiently. The 15° contact angle and robust construction with 26 balls contribute to high dynamic and static load ratings.
- Optimized High-Speed Performance: The lightweight phenolic resin cage ensures low inertia and excellent guidance at high rotational speeds, contributing to a high limiting speed. The bearing is supplied pre-lubricated for immediate operation.
- Precision & Accuracy: Manufactured to P4A tolerance class with tight dimensional control on bore, outside diameter, and width. This guarantees precise shaft positioning, reduced vibration, and smooth operation.
71920 CD/P4ADBB Bearing Typical Application Areas
This bearing is specifically designed for high-performance machinery where precision, speed, and rigidity are paramount. Typical applications include:
- Machine Tool Spindles (e.g., for milling, grinding, and turning centers)
- High-Frequency Motor Spindles
- Precision Gearboxes
- Industrial Pumps and Compressors
- Robotic Arm Joints and Precision Rotary Axes
