71920 ACDGC/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71920 ACDGC/P4A
Basic Information
System of measurement
Metric
Weight
0.8 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
20 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
12.7 mm
Ball quantity
26
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
12870 lbf
Radial static load rating
14175 lbf
Limiting speed
15 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
Preload
Moderate / Class C
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 ACDGC/P4A Bearing Product Overview & Core Advantages
The 71920 ACDGC/P4A is a single row angular contact ball bearing designed for applications demanding high precision and superior rigidity. Engineered to a P4A tolerance class, it offers exceptional dimensional accuracy and running precision. This bearing is optimized to support high combined loads, handling significant axial loads in one direction alongside radial loads, making it ideal for high-speed spindles and other precision machinery where high rigidity and operational stability are critical. Its phenolic cage and universal matchable (SU) designation allow for flexible mounting configurations in complex arrangements.
71920 ACDGC/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning | Advantage |
|---|---|---|
| AC | Angular Contact | Optimized for combined radial and axial loads. |
| D | High Contact Angle (25°) | Provides high axial load carrying capacity. |
| GC | Moderate Preload (Class C) | Enhances system rigidity and reduces vibration. |
| P4A | High Precision Tolerance Class | Ensures exceptional running accuracy and dimensional stability. |
71920 ACDGC/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Load Capacity: The 25° contact angle and moderate preload (Class C) are key to achieving high system rigidity. This design enables the bearing to effectively support combined loads, offering excellent resistance to deflection under operational stresses.
- High-Speed Performance: The lightweight phenolic cage minimizes centrifugal forces, contributing to stable operation at the high limiting speed of 15,000 rpm. This makes it a true high-speed bearing.
- Precision Engineering: Manufactured to P4A tolerance class with tight bore and outside diameter tolerances, this bearing guarantees superior running accuracy, low noise, and minimal vibration, which is essential for precision applications.
- Universal Matching Capability (SU): Designed as a universal matchable bearing, it can be paired with another identical bearing in various pre-loaded arrangements (e.g., back-to-back, face-to-face), providing design flexibility for complex spindle configurations.
71920 ACDGC/P4A Bearing Typical Application Areas
This precision angular contact ball bearing is ideally suited for high-performance machinery, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: Applications in PCB drilling, precision grinding, and other high-accuracy machining.
- High-Speed Motors: Where high rotational speeds and rigidity are required.
- Robotics: Critical joints and arms requiring high precision and stiffness.
