71940 ACD/P4ATBTB
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71940 ACD/P4ATBTB
Basic Information
System of measurement
Metric
Weight
18.3 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
200 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
280 mm
Outside diameter tolerance
-0.004mm to 0
Width
114 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
25.4 mm
Ball quantity
26
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
95175 lbf
Radial static load rating
168750 lbf
Limiting speed
6.3 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
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
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71940 ACD/P4ATBTB Bearing Product Overview & Core Advantages
The 71940 ACD/P4ATBTB is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This matched set bearing features a Triplex Back-to-Back (TBT) arrangement, providing superior stability and the ability to withstand combined loads—significant radial and axial loads in both directions. Manufactured to a P4A tolerance class, it delivers ultra-precision performance, making it ideal for high-speed spindles and other critical machinery where high rigidity and operational reliability are paramount.
71940 ACD/P4ATBTB Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| ACD | Angular Contact Design with a 25° contact angle, optimized for high axial load capacity. |
| P4A | Indicates a super-precision tolerance class with enhanced running accuracy for demanding applications. |
| TBT | Signifies a Triplex Back-to-Back matched set of three bearings, providing maximum rigidity and moment load resistance. |
71940 ACD/P4ATBTB Bearing Structural Features & Performance Benefits
- Exceptional Rigidity and Stability: The Triplex Back-to-Back (TBT) arrangement of three bearings creates an extremely stiff bearing system, effectively resisting complex moment loads and ensuring precise shaft positioning.
- High Load Capacity: The 25° contact angle and robust construction enable high radial and bidirectional axial load carrying capabilities, suitable for combined loads.
- Optimized High-Speed Performance: The lightweight phenolic cage reduces centrifugal forces, while the P4A precision and optimized internal geometry contribute to smooth operation at high speeds, with a limiting speed of 6,300 rpm.
- Pre-Configured for Performance: The set is supplied with a Light preload (Class B), ensuring optimal internal clearance for immediate high-performance operation without the need for on-site adjustment.
71940 ACD/P4ATBTB Bearing Typical Application Areas
This bearing is engineered for high-performance machinery where precision, speed, and rigidity are critical. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Gearboxes: Industrial gearboxes requiring high accuracy and load capacity.
- High-Frequency Motors and Spindles: Applications in aerospace and advanced manufacturing.
- Robotic Drives and Rotary Tables: Where high moment stiffness and positional accuracy are required.
