71812 ACD/P4DBA
71800 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71812 ACD/P4DBA
Basic Information
System of measurement
Metric
Weight
0.2 kg
Tolerance class
P4
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
60 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
78 mm
Outside diameter tolerance
-0.004mm to 0
Width
20 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
5.556 mm
Ball quantity
28
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
4680 lbf
Radial static load rating
5962 lbf
Limiting speed
35 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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71812 ACD/P4DBA Bearing Product Overview & Core Advantages
The 71812 ACD/P4DBA 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 excels at simultaneously handling combined radial and axial loads. Manufactured to P4 tolerance class, it delivers superior running accuracy, making it ideal for high-speed spindles and other precision machinery where minimal runout and high system rigidity are critical. The phenolic cage and optimized 25° contact angle contribute to its outstanding high-speed performance and operational stability.
71812 ACD/P4DBA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71812 | Basic bearing designation, indicating a light series angular contact ball bearing with a 60 mm bore. |
| AC | Angular Contact design. |
| D | Duplex (Two single bearings are paired). |
| P4 | High precision tolerance class, ensuring extremely tight dimensional and running accuracy. |
| DB | Back-to-Back mounting arrangement. This configuration provides high moment rigidity and is excellent for withstanding overturning moments. |
| A | Extra Light preload, applied to the bearing set to eliminate internal clearance and enhance system stiffness. |
71812 ACD/P4DBA Bearing Structural Features & Performance Benefits
- High Rigidity & Moment Capacity: The duplex back-to-back (DB) arrangement creates a wide effective spread between the load centers, significantly increasing the bearing set's ability to resist moment loads and providing exceptional system rigidity.
- Superior Load Capacity: The 25° contact angle is optimized to handle substantial combined loads, offering a balanced performance for both radial and axial forces.
- High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, lowers friction, and allows for higher limiting speeds (up to 35,000 rpm). This material also offers excellent performance under poor lubrication conditions.
- Precision Operation: Manufactured to ABEC 7 / P4 tolerance class with very tight bore and outside diameter tolerances, this bearing ensures minimal vibration and precise shaft positioning, which is critical for high-precision applications.
71812 ACD/P4DBA Bearing Typical Application Areas
This precision duplex bearing set is engineered for high-performance applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling, engraving machines, and high-frequency motors.
- Robotics: High-accuracy joints and arm assemblies requiring high rigidity.
- Medical Equipment: Dental handpieces and surgical drill spindles.
- Aerospace & Defense Systems: Gyroscopes, radar equipment, and other critical instrumentation.
