71920 CE/P4ADBB
71900 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
71920 CE/P4ADBB
Basic Information
System of measurement
Metric
Weight
1.54 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
24
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
14332 lbf
Radial static load rating
14175 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 CE/P4ADBB Bearing Product Overview & Core Advantages
The 71920 CE/P4ADBB is a high-precision duplex angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This matched back-to-back (DB) arrangement provides superior stability and is preloaded to Class B (Light) specifications, ensuring minimal axial and radial play under operational conditions. Its primary advantage lies in its ability to handle combined loads—simultaneously supporting substantial radial loads and axial loads from both directions—making it an ideal choice for high-speed spindles and precision machinery where high rigidity and dimensional accuracy are paramount.
71920 CE/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| CE | Indicates a 15° contact angle and specific internal design optimized for high-speed operation and high rigidity. |
| P4A | Denotes an ultra-high precision tolerance class, exceeding ABEC 7 (ISO Class 4) standards, for applications requiring extreme running accuracy. |
| DB | Specifies a Duplex Back-to-Back matched set. This arrangement increases moment rigidity and is ideal for supporting overturning moments. |
71920 CE/P4ADBB Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The duplex back-to-back (DB) configuration creates a wide, rigid support system that significantly resists moment loads and shaft deflection, ensuring precise alignment and stable operation under heavy combined loads.
- Superior Precision: Manufactured to P4A tolerance class, this bearing guarantees minimal runout and exceptional dimensional consistency, which is critical for maintaining accuracy in high-speed spindles.
- Optimized High-Speed Performance: The phenolic resin cage is lightweight, strong, and exhibits excellent performance at high rotational speeds, contributing to a limiting speed of 16,000 rpm. The standard 15° contact angle further reduces heat generation and friction at high speeds.
- Robust Load Capacity: With a dynamic load rating of 14,332 lbf and a static load rating of 14,175 lbf, this bearing is engineered for long service life in demanding applications.
71920 CE/P4ADBB Bearing Typical Application Areas
This precision bearing is specifically engineered for high-performance machinery where accuracy, speed, and rigidity are non-negotiable. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles: Internal, external, and surface grinding machines.
- High-Frequency Motors: Spindles for PCB drilling and other high-RPM applications.
- Industrial Pumps & Compressors: Applications requiring precise shaft positioning and high-speed operation.
