71940 CD/P4ATBTA
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71940 CD/P4ATBTA
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
15 °
Ball & Washer Dimensions
Ball diameter
25.4 mm
Ball quantity
26
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
101025 lbf
Radial static load rating
180000 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
Extra light / Class A
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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In Stock
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71940 CD/P4ATBTA Bearing Product Overview & Core Advantages
The 71940 CD/P4ATBTA is a metric precision angular contact ball bearing supplied as a triplex matched set in a back-to-back (TBT) arrangement. Engineered for applications demanding extremely high rigidity and superior running accuracy, this bearing configuration is designed to handle combined loads (radial and axial) simultaneously. The P4A tolerance class and extra light preload (Class A) ensure exceptional performance in high-speed, high-precision environments such as machine tool spindles.
71940 CD/P4ATBTA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71940 | Basic bearing series and size designation. |
| CD | Contact angle of 15°. |
| P4A | High precision tolerance class, exceeding ABEC 7/ISO P4 standards. |
| TBT | Triplex Back-to-Back matched set arrangement. |
| A | Extra light preload applied to the matched set. |
71940 CD/P4ATBTA Bearing Structural Features & Performance Benefits
- Unmatched Rigidity & Stability: The triplex back-to-back (TBT) arrangement creates a highly rigid bearing system that effectively resists moment loads and shaft deflection, which is critical for maintaining precision under heavy combined loads.
- High-Speed Capability: The phenolic resin cage offers low weight and excellent performance at high rotational speeds, contributing to a limiting speed of 6,300 rpm. The optimized internal geometry and 15° contact angle further enhance high-speed operation.
- Precision & Accuracy: Manufactured to a P4A tolerance class with extremely tight dimensional tolerances on the bore, outside diameter, and width, this bearing guarantees smooth, quiet, and vibration-free running essential for ultra-precise applications.
- Optimized Load Capacity: With a high dynamic load rating of 101,025 lbf and static load rating of 180,000 lbf, the set is built for demanding operational conditions and long service life.
71940 CD/P4ATBTA Bearing Typical Application Areas
This bearing is ideally suited for high-performance machinery where maximum rigidity and precision are non-negotiable. Key applications include:
- High-Frequency Machine Tool Spindles (milling, grinding, boring)
- Precision Grinding Spindles
- High-Speed Centrifuges
- Industrial Pumps & Compressors
- Other high-speed, high-accuracy rotary equipment
