71811 CD/P4DBA
71800 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71811 CD/P4DBA
Basic Information
System of measurement
Metric
Weight
0.16 kg
Tolerance class
P4
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
55 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
72 mm
Outside diameter tolerance
-0.004mm to 0
Width
18 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
4.762 mm
Ball quantity
29
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
3780 lbf
Radial static load rating
4860 lbf
Limiting speed
34 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
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In Stock
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71811 CD/P4DBA Bearing Product Overview & Core Advantages
The 71811 CD/P4DBA is a precision duplex angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. This matched back-to-back (DB) arrangement is preloaded to Extra Light (Class A) specifications, providing superior system stiffness and precise shaft positioning. It excels at handling combined loads (radial and axial) simultaneously, making it ideal for high-speed, high-precision machinery where minimal runout and thermal stability are critical.
71811 CD/P4DBA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71811 | Basic bearing designation, indicating a metric, single-row angular contact bearing with a 55 mm bore. |
| C | Designates a 15° contact angle, optimized for high-speed operation and moderate axial loads. |
| D | Indicates the bearing is part of a duplex (paired) set. |
| P4 | Specifies a high precision tolerance class (P4), ensuring extremely tight dimensional and running accuracy. |
| DB | Defines the Back-to-Back mounting arrangement, which provides high moment rigidity and excellent stability under complex loads. |
| A | Specifies the Extra Light preload level, minimizing friction and heat generation for optimal high-speed performance. |
71811 CD/P4DBA Bearing Structural Features & Performance Benefits
- High Rigidity & System Stiffness: The duplex back-to-back (DB) arrangement creates a rigid bearing system that effectively resists moment loads and shaft deflection, ensuring precise rotational axis control.
- Optimized for Combined Loads: The 15° contact angle is engineered to support significant radial loads while simultaneously handling thrust loads from both directions.
- Superior High-Speed Performance: The lightweight phenolic resin cage minimizes centrifugal forces, reduces friction, and contributes to the high limiting speed of 34,000 rpm. The open design and factory-applied lubrication facilitate efficient heat dissipation.
- Precision Engineering: Manufactured to P4 tolerance class with extremely tight bore, OD, and width tolerances, this bearing guarantees low vibration, smooth operation, and extended service life in precision applications.
- Durable Construction: Components made from chrome steel offer high load capacity and durability, suitable for a wide temperature range from -30°C to 110°C.
71811 CD/P4DBA Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning centers requiring utmost precision and rigidity.
- Precision Gearboxes: Applications where low noise, high speed, and accurate shaft alignment are paramount.
- High-Frequency Spindles: PCB drilling, engraving, and other high-RPM machining operations.
- Robotic Arm Joints & Precision Rotary Axes: Providing high stiffness and accuracy in automated systems.
- Medical and Laboratory Equipment: Centrifuges and other devices demanding smooth, quiet, and reliable high-speed rotation.
