71940 CDGB/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71940 CDGB/P4A
Basic Information
System of measurement
Metric
Weight
6.1 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
38 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
46800 lbf
Radial static load rating
59625 lbf
Limiting speed
6.3 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Number of bearings in matched set
3
Universal matching bearing
Universal Matchable (SU)
Preload
Light / Class B
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 CDGB/P4A Bearing Product Overview & Core Advantages
The 71940 CDGB/P4A is a super-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and high-speed performance. As a single bearing with a 15° contact angle and Light preload (Class B), it is engineered to handle combined loads, primarily supporting high radial loads and axial loads in one direction. Its P4A tolerance class ensures ultra-precise running accuracy, making it ideal for high-reliability spindles and precision machinery. The open design, combined with a phenolic cage, facilitates optimal lubrication flow for superior high-speed capabilities.
71940 CDGB/P4A Bearing Model Code Explained, Specifications & Naming Convention
The model number 71940 CDGB/P4A provides detailed technical specifications through its suffixes:
- 71940: Basic series designation for a super-precision angular contact ball bearing.
- C: Signifies a 15° contact angle, optimized for high-speed operation.
- D: Indicates the bearing is a Universal Matchable (SU) type, allowing for precise pairing in sets.
- GB: Denotes a Light preload (Class B), which minimizes deflection and ensures rigidity under operational conditions.
- P4A: Specifies the tolerance class, representing a very high level of dimensional and running accuracy superior to ABEC 7.
71940 CDGB/P4A Bearing Structural Features & Performance Benefits
- High Precision & Rigidity: Manufactured to P4A tolerance standards with a Light preload, this bearing provides exceptional running accuracy and system stiffness, reducing vibration and ensuring precise positioning.
- Optimized for High Speeds: The phenolic resin cage offers excellent strength-to-weight ratio and smooth operation at the specified limiting speed of 6,300 rpm. The open design allows for efficient lubrication management, critical for thermal stability at high rotational velocities.
- Superior Load Capacity: With a dynamic load rating of 46,800 lbf and a static load rating of 59,625 lbf, the bearing is capable of handling significant combined radial and axial loads.
- Universal Matching Capability (SU): Designed to be universally matchable, these bearings can be mounted in sets (typically in a 3-bearing arrangement as specified) to create a pre-loaded system without the need for selective assembly, simplifying installation and enhancing performance.
71940 CDGB/P4A Bearing Typical Application Areas
The 71940 CDGB/P4A is ideally suited for high-performance applications where precision and speed are critical. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: Applications in PCB drilling, semiconductor manufacturing, and other precision machining.
- High-Frequency Motors: Spindles for routers and other high-RPM electric motors.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other precision instrumentation.
