71940 CD/P4A
71900 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
71940 CD/P4A
Basic Information
System of measurement
Metric
Weight
6.1 kg
Tolerance class
P4 (ABEC-7)
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
200 mm
Bore diameter tolerance
-0.012mm to 0
Outside diameter
280 mm
Outside diameter tolerance
-0.013mm to 0
Width
38 mm
Width tolerance
-0.24mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
25.4 mm
Ball quantity
26
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
46800 lbf
Radial static load rating
59625 lbf
Limiting speed
7 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Preload
Available
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 862.9
/ each
In Stock
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71940 CD/P4A Bearing Product Overview & Core Advantages
The 71940 CD/P4A is a single-row angular contact ball bearing engineered for applications demanding high precision and superior running accuracy. Manufactured to P4 (ABEC-7) tolerance class, it is designed to accommodate high axial loads in one direction while simultaneously supporting radial loads. Its phenolic cage and optimized internal geometry contribute to excellent high-speed performance and operational stability, making it an ideal choice for high-performance spindles and precision machinery.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 71940 | Basic bearing series and size designation. |
| C | Specifies a 15° contact angle, optimized for high axial load capacity. |
| D | Indicates that the bearing is supplied with a preload for enhanced rigidity and precise shaft positioning. |
| P4A | Denotes a P4 (ABEC-7) tolerance class, ensuring extremely tight dimensional and running accuracy for precision applications. |
71940 CD/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The combination of a 15° contact angle and factory-applied preload (D) provides high system rigidity, minimizes deflection under load, and ensures exceptional running accuracy, which is critical for machine tool spindles.
- Superior High-Speed Capability: The lightweight and robust phenolic resin cage offers excellent dimensional stability and low friction, enabling stable operation at the high limiting speed of 7,000 rpm.
- Optimized Load Capacity: The single-row design with a specific contact angle is engineered to handle significant axial loads in one direction combined with radial loads, as reflected in its high dynamic and static load ratings.
- Precision-Grade Components: Manufactured from high-grade chrome steel for rings and balls, and built to P4 tolerance, this bearing guarantees consistent performance and long service life in demanding conditions.
71940 CD/P4A Bearing Typical Application Areas
This precision angular contact bearing is ideally suited for applications requiring high speed, high rigidity, and precise rotation. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling machines and precision engraving equipment.
- High-Frequency Motors: Spindles for electric motors operating at high rotational speeds.
- Medical Equipment: High-speed rotors in dental handpieces and centrifuges.
