71920 ACD/P4AQBTB
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71920 ACD/P4AQBTB
Basic Information
System of measurement
Metric
Weight
3.2 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
80 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
33975 lbf
Radial static load rating
56250 lbf
Limiting speed
15 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Quadruplex Tandem Back-to-Back (QBT)
Number of bearings in matched set
4
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.
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71920 ACD/P4AQBTB Bearing Product Overview & Core Advantages
The 71920 ACD/P4AQBTB is a precision quadruplex angular contact ball bearing specifically engineered for demanding applications requiring exceptional rigidity and high load capacity. This metric system bearing features a light preload (Class B) and is supplied as a matched set of four bearings in a Tandem Back-to-Back (QBT) arrangement. This sophisticated configuration is designed to handle significant combined loads (radial and axial) simultaneously while providing maximum system stability and rotational accuracy, making it ideal for high-performance, high-reliability machinery.
Model Code In-Depth Analysis
| Code Segment | Technical Meaning |
|---|---|
| 71920 | Basic bearing series and size designation (100mm bore, 140mm OD, 80mm width). |
| ACD | Angular Contact design with a 25° contact angle. |
| P4A | Indicates a high-precision tolerance class, exceeding standard P4 levels for superior running accuracy. |
| QBTB | Denotes a Quadruplex (4 bearings) matched set in a Tandem Back-to-Back arrangement. |
71920 ACD/P4AQBTB Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The quadruplex QBT arrangement creates an extremely rigid bearing system capable of supporting high radial dynamic load ratings of 33,975 lbf and static load ratings of 56,250 lbf. This configuration is optimized to withstand complex combined loads.
- Precision Performance: Manufactured to P4A tolerance class with a 25° contact angle, this bearing ensures minimal runout and exceptional rotational accuracy for precise applications.
- Optimized High-Speed Operation: The phenolic cage contributes to lower friction and higher limiting speeds (15,000 rpm), making it suitable for high-speed spindles.
- Durability & Reliability: Constructed from chrome steel for both rings and balls, the bearing offers high wear resistance and long service life. It comes pre-lubricated for immediate operation.
71920 ACD/P4AQBTB Bearing Typical Application Areas
This bearing is specifically designed for high-end industrial applications where precision, speed, and rigidity are paramount. Key sectors include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: Applications in semiconductor manufacturing and PCB drilling equipment.
- High-Frequency Motors: Where precise rotor positioning and high rigidity are required.
- Advanced Robotics: Critical joints and actuators demanding high moment load capacity.
