71920 ACD/P4ADBB
71900 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
71920 ACD/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
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
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
No drawings available at the moment, will be launched soon
In Stock
Price available upon request.
Our sales team will respond within 24 hours with a competitive quote tailored to your requirements.
REQUEST A QUOTE
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
71920 ACD/P4ADBB Bearing Product Overview & Core Advantages
The 71920 ACD/P4ADBB is a precision duplex back-to-back angular contact ball bearing designed for applications requiring exceptional rotational accuracy and rigidity. This matched bearing set features a P4A tolerance class and a light preload (Class B), making it ideal for high-precision spindles and machinery. Its primary advantage lies in its ability to support combined loads—significant radial and axial loads in both directions—simultaneously. The back-to-back arrangement provides high moment rigidity and excellent operational stability, ensuring reliable performance in demanding conditions.
71920 ACD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| ACD | Angular Contact Design with a 25° contact angle, optimized for combined loads. |
| P4A | High precision tolerance class with enhanced running accuracy and dimensional stability. |
| DB | Duplex Back-to-Back arrangement. This configuration increases rigidity and moment load capacity. |
71920 ACD/P4ADBB Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The duplex back-to-back (DB) arrangement creates a wide effective spread, significantly enhancing system rigidity and resistance to moment loads. This is critical for maintaining precision under heavy combined loads.
- Superior Load Capacity: With a 25° contact angle and a dynamic load rating of 20,768 lbf, this bearing is engineered to handle high radial and bidirectional axial loads efficiently.
- Precision & Speed: The P4A tolerance class ensures minimal runout and vibration, while the phenolic cage contributes to smooth operation at high speeds, with a limiting speed of 15,000 rpm. The light preload minimizes deflection at operating speeds.
- Durability & Reliability: Manufactured from chrome steel for both rings and balls, the bearing offers excellent wear resistance and long service life in a standard lubricated state.
71920 ACD/P4ADBB Bearing Typical Application Areas
This bearing is specifically designed for high-performance applications where precision and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers.
- Precision Grinding Spindles: Where extreme accuracy and minimal runout are required.
- High-Frequency Machining Centers: Demanding high rotational speeds and stability.
- Industrial Pumps and Compressors: For applications requiring precise shaft positioning and load support.
