71940 ACD/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71940 ACD/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
25 °
Ball & Washer Dimensions
Ball diameter
25.4 mm
Ball quantity
26
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
44775 lbf
Radial static load rating
56250 lbf
Limiting speed
6.3 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:
$ 1390.6
/ each
In Stock
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71940 ACD/P4A Bearing Product Overview & Core Advantages
The 71940 ACD/P4A is a single-row angular contact ball bearing engineered for high-precision applications requiring exceptional rotational accuracy and rigidity. Designed to accommodate primarily axial loads in one direction, combined with radial loads, its 25° contact angle provides optimal performance for high-speed operation. Manufactured to P4 (ABEC-7) tolerance class, this bearing delivers superior running accuracy, making it ideal for demanding applications where minimal runout and vibration are critical. The phenolic cage and preload availability further enhance its stability and high-speed capability.
71940 ACD/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71940 | Basic bearing designation, indicating a single-row angular contact ball bearing with a 200mm bore and 280mm outside diameter. |
| AC | Angular Contact design with a 25° contact angle. |
| D | Signifies a high-capacity internal design, typically featuring larger ball diameter and quantity for increased load rating. |
| P4A | Indicates a P4 (ABEC-7) tolerance class with specific dimensional and running accuracy requirements suitable for precision spindle applications. |
71940 ACD/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Load Capacity: The 25° contact angle and optimized internal geometry enable the bearing to handle significant axial loads and combined loads. The use of 26 balls with a 25.4mm diameter contributes to its high dynamic and static load ratings (44,775 lbf / 56,250 lbf).
- Superior High-Speed Performance: The lightweight phenolic resin cage minimizes centrifugal forces, reduces friction, and ensures stable operation at the limiting speed of 6,300 rpm. This makes it an excellent choice for high-speed spindles.
- Precision Engineering: Manufactured to P4 tolerance class, this bearing guarantees extremely tight dimensional control and minimal runout, which is critical for achieving high rotational accuracy and surface finish in machined components.
- Wide Operating Range: Constructed from chrome steel for both rings and balls, the bearing operates reliably within a temperature range of -30°C to 110°C.
71940 ACD/P4A Bearing Typical Application Areas
This precision angular contact bearing is ideally suited for applications demanding high speed, accuracy, and rigidity, including:
- Machine Tool Spindles (milling, grinding, and turning centers)
- High-Frequency Motor Spindles
- Precision Grinding Equipment
- Industrial Pumps and Compressors
- Aerospace and Defense Positioning Systems
