71920 ACD/P4AQBTC
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71920 ACD/P4AQBTC
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
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/P4AQBTC Bearing Product Overview & Core Advantages
The 71920 ACD/P4AQBTC is a precision quadruplex matched set of angular contact ball bearings designed for the most demanding applications. This high-rigidity arrangement, configured in a Tandem Back-to-Back (QBT) quadruplex set, is engineered to handle combined loads with exceptional stability and accuracy. With its P4A tolerance class and moderate preload, it delivers superior rotational precision, making it ideal for high-speed, high-performance machinery where uncompromising reliability is required.
71920 ACD/P4AQBTC Bearing Model Code Explained, Specifications & Naming Convention
The model number 71920 ACD/P4AQBTC provides detailed technical specifications:
- 71920: Basic bearing series and size designation (Bore: 100mm, OD: 140mm, Width: 20mm per bearing).
- ACD: Angular Contact design with a 25° contact angle.
- P4A: Indicates a high-precision tolerance class, superior to ABEC-7, ensuring minimal runout and vibration.
- QBT: Denotes the bearing is part of a Quadruplex (4 bearings) set in a Tandem Back-to-Back arrangement. This specific configuration provides maximum axial rigidity and load sharing.
- C: Specifies a Moderate preload applied to the set, optimizing stiffness and minimizing deflection under load.
71920 ACD/P4AQBTC Bearing Structural Features & Performance Benefits
- Unmatched Rigidity and Load Capacity: The quadruplex matched set in a Tandem Back-to-Back (QBT) arrangement creates an extremely stiff bearing system. This design is optimized to handle significant combined radial and axial loads simultaneously, providing superior support for heavy and complex loading conditions.
- Precision Performance: Manufactured to a P4A tolerance class, these bearings guarantee extremely tight dimensional and running accuracy, which is critical for applications requiring minimal vibration and high positional accuracy.
- Optimized High-Speed Operation: The phenolic resin cage offers low weight and excellent performance at high speeds, contributing to a high limiting speed. The standard lubrication is suitable for the specified operating range.
- Robust Construction: Made from chrome steel for both rings and balls, this bearing set ensures high durability and a long service life under demanding operational stresses.
71920 ACD/P4AQBTC Bearing Typical Application Areas
This precision quadruplex bearing set is specifically engineered for high-end industrial equipment where extreme rigidity, accuracy, and reliability are non-negotiable. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Gearboxes and High-Torque Drives.
- Aerospace Actuation Systems and Robotic Rotary Joints.
- Any application requiring a pre-matched, pre-loaded bearing set for simplified installation and guaranteed performance.
