71940 CD/P4ADBA
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71940 CD/P4ADBA
Basic Information
System of measurement
Metric
Weight
12.2 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
76 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
76050 lbf
Radial static load rating
119250 lbf
Limiting speed
6.3 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Duplex Back-to-Back (DB)
Number of bearings in matched set
2
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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71940 CD/P4ADBA Bearing Product Overview & Core Advantages
The 71940 CD/P4ADBA is a precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This duplex back-to-back (DB) arrangement bearing set provides superior stability and can accommodate combined radial and axial loads. Manufactured to P4A tolerance class, it ensures minimal runout and vibration, making it ideal for high-speed, high-precision machinery. The phenolic cage and optimized 15° contact angle contribute to its excellent high-speed performance and operational reliability.
71940 CD/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
The model number 71940 CD/P4ADBA is decoded as follows:
- 71940: Basic bearing series, indicating a high-precision angular contact design with a 200mm bore.
- C: Represents a 15° contact angle, optimized for high-speed applications with moderate axial load capacity.
- D: Indicates the bearing is part of a duplex pair in a specific preload arrangement.
- P4A: Denotes a very high precision tolerance class, exceeding ABEC 7 standards, with strict limits on dimensional and running accuracy.
- DB: Specifies the Duplex Back-to-Back mounting arrangement, which provides high moment rigidity and increased operational stability.
- A: Indicates an Extra Light preload within the matched set, minimizing friction and heat generation at high speeds.
71940 CD/P4ADBA Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The duplex back-to-back (DB) arrangement creates a wide, rigid support system that effectively resists moment loads and shaft deflection, ensuring precise shaft positioning.
- Superior Load Capacity: Engineered to handle significant combined radial and axial loads simultaneously. The 15° contact angle provides an optimal balance for applications with substantial axial forces.
- High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, while the precision-ground chrome steel balls and raceways enable a high limiting speed of 6,300 rpm.
- Precision Operation: Manufactured to P4A tolerance class, this bearing guarantees minimal runout and vibration, which is critical for applications requiring smooth, quiet operation and high rotational accuracy.
- Optimized Material Selection: The use of high-grade chrome steel for rings and balls ensures long service life and durability under heavy loads.
71940 CD/P4ADBA Bearing Typical Application Areas
The 71940 CD/P4ADBA is ideally suited for high-performance applications where precision and speed are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Gearboxes: High-torque, high-speed industrial transmissions.
- Industrial Pumps & Compressors: Centrifugal pumps and compressor shafts requiring precise axial location.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other precision instrumentation.
- Medical Equipment: High-speed dental handpieces and imaging device rotors.
