71932 ACD/P4ATBTA
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71932 ACD/P4ATBTA
Basic Information
System of measurement
Metric
Weight
8.1 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
160 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
220 mm
Outside diameter tolerance
-0.004mm to 0
Width
84 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
19.05 mm
Ball quantity
28
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
59625 lbf
Radial static load rating
102375 lbf
Limiting speed
11 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Triplex Back-to-Back (TBT)
Number of bearings in matched set
3
Universal matching bearing
No (Standard)
Preload
Extra light / Class A
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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71932 ACD/P4ATBTA Bearing Product Overview & Core Advantages
The 71932 ACD/P4ATBTA is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. This triplex back-to-back (TBT) matched set provides superior stiffness and moment load capacity, making it ideal for high-precision spindles. Its P4A tolerance class ensures extremely tight dimensional and running accuracy, while the extra light preload (Class A) minimizes deflection under operational loads, contributing to outstanding performance in high-speed and high-rigidity scenarios.
71932 ACD/P4ATBTA Bearing Model Code Explained, Specifications & Naming Convention
The model number 71932 ACD/P4ATBTA is decoded as follows:
- 71932: Basic series designation for a high-precision angular contact ball bearing.
- A: Denotes a 25° contact angle, optimized for supporting combined loads with a high axial load component.
- CD: Indicates a duplex bearing with a specific internal clearance and preload. In this context, it is part of a larger matched set designation.
- P4A: Specifies an ultra-precision tolerance class exceeding ABEC 7 (P4) standards, with additional running accuracy requirements.
- TB: Signifies the bearings are matched in a Triplex Back-to-Back (TBT) arrangement.
- TA: Identifies the specific preload group as Extra Light (Class A).
71932 ACD/P4ATBTA Bearing Structural Features & Performance Benefits
- Exceptional Rigidity and Load Capacity: The triplex back-to-back (TBT) arrangement of three bearings creates an extremely rigid system capable of withstanding heavy combined radial and axial loads as well as high moment loads, which is critical for machine tool spindles.
- High-Speed Capability: The lightweight and robust phenolic resin cage ensures stable operation and reduced centrifugal forces, enabling high limiting speeds of up to 11,000 rpm.
- Precision Performance: Manufactured to P4A super-precision tolerance standards, this bearing guarantees minimal runout and vibration, directly contributing to superior machining finish and accuracy.
- Optimized Preload: The extra light preload (Class A) is applied to eliminate internal clearance, enhancing system stiffness without generating excessive heat, which is vital for maintaining precision at high speeds.
- Premium Materials: Constructed from chrome steel for both rings and balls, ensuring high durability, wear resistance, and a long operational lifespan under demanding conditions.
71932 ACD/P4ATBTA Bearing Typical Application Areas
This bearing is engineered for the most demanding high-precision and high-speed applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles: Internal and external grinding machines.
- High-Frequency Machining Centers
- Industrial High-Speed Pumps and Compressors
- Advanced Robotics and Precision Positioning Systems
