71920 ACD/P4ADGC
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71920 ACD/P4ADGC
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
25 °
Ball & Washer Dimensions
Ball diameter
12.7 mm
Ball quantity
26
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
20768 lbf
Radial static load rating
28125 lbf
Limiting speed
15 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Universal Matchable (SU)
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
No drawings available at the moment, will be launched soon
In Stock
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71920 ACD/P4ADGC Bearing Product Overview & Core Advantages
The 71920 ACD/P4ADGC is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and rigidity. Engineered to a P4A tolerance class, it offers superior running accuracy and dimensional stability. Its key advantage lies in its ability to accommodate combined loads (simultaneous radial and axial loads) efficiently. The Universal Matchable (SU) designation allows two bearings to be universally paired for optimal performance in preloaded arrangements, delivering high rigidity and minimal runout, making it ideal for high-speed, high-precision spindles and machinery.
71920 ACD/P4ADGC Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning | Significance |
|---|---|---|
| ACD | 25° Contact Angle, High Rigidity Design | Optimized for carrying significant axial loads and providing high system stiffness. |
| P4A | Tolerance Class (Equivalent to ABEC 7) | Denotes very high precision in bore, OD, and width tolerances for superior running accuracy. |
| DGC | Moderate Preload (Class C) | Bearings are supplied with a controlled internal preload to minimize axial and radial play, enhancing rigidity from startup. |
71920 ACD/P4ADGC Bearing Structural Features & Performance Benefits
- High Rigidity and Load Capacity: The 25° contact angle and robust construction enable the bearing to support high combined loads. The Universal Matchable (SU) feature allows two bearings to be mounted in a back-to-back or face-to-face arrangement, creating a system with significantly increased moment rigidity.
- High-Speed Performance: The lightweight and durable phenolic resin cage ensures stable operation and reduced centrifugal forces, contributing to a high limiting speed of 15,000 rpm. The open design facilitates efficient lubrication and heat dissipation.
- Precision Engineering: Manufactured to P4A tolerance standards with tight dimensional controls on the bore diameter, outside diameter, and width. This results in smooth, quiet operation with minimal vibration, which is critical for precision applications.
- Durability and Reliability: Constructed from high-grade chrome steel for both rings and balls, ensuring long service life and resistance to wear. The pre-greased condition provides immediate, reliable operation upon installation.
71920 ACD/P4ADGC Bearing Typical Application Areas
This bearing is specifically engineered for high-performance machinery where precision and speed are paramount. Key application areas include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling, high-frequency motor spindles.
- Industrial Pumps and Compressors: Applications requiring high axial and radial load support.
- Robotics and Automation: High-accuracy rotary joints and arm assemblies.
