71803 ACD/P4DBAVR521
71800 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71803 ACD/P4DBAVR521
Basic Information
System of measurement
Metric
Weight
0.02 kg
Tolerance class
N
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
17 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
26 mm
Outside diameter tolerance
-0.004mm to 0
Width
10 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
2.381 mm
Ball quantity
18
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
806 lbf
Radial static load rating
686 lbf
Limiting speed
103 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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71803 ACD/P4DBAVR521 Bearing Product Overview & Core Advantages
The 71803 ACD/P4DBAVR521 is a precision duplex angular contact ball bearing designed for applications demanding exceptional accuracy and rigidity. This matched pair in a back-to-back (DB) arrangement is preloaded to Extra Light (Class A) specifications, ensuring minimal axial and radial play for superior rotational precision. Its primary advantage lies in its ability to handle combined loads—significant radial and bidirectional axial loads—simultaneously, making it ideal for high-speed, high-rigidity spindles and precision mechanisms. The open design, combined with a phenolic cage, facilitates high-speed operation while maintaining dimensional stability.
71803 ACD/P4DBAVR521 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71803 | Basic bearing series and size designation (17mm bore, 26mm OD). |
| ACD | Angular Contact, Duplex arrangement. Specifies the bearing type and configuration. |
| P4 | High precision tolerance class, superior to ABEC-7. |
| DB | Back-to-Back mounting. This arrangement provides high moment rigidity. |
| A | Specifies the preload level as "Extra Light" (Class A). |
| VR521 | Manufacturer's internal code for the specific lubrication type used. |
71803 ACD/P4DBAVR521 Bearing Structural Features & Performance Benefits
- High Rigidity & Precision: The duplex back-to-back (DB) design and Class A preload create an exceptionally stiff bearing system that resists deflection under load, ensuring precise shaft positioning and repeatability.
- Superior Load Capacity: With a 25° contact angle and duplex pairing, this bearing excels at handling combined radial and axial loads from both directions, a critical requirement for complex load scenarios.
- Optimized High-Speed Performance: The lightweight phenolic cage minimizes centrifugal forces and friction, while the open seal-less design reduces drag, collectively enabling a high limiting speed of 103,000 rpm.
- Stable Thermal Operation: The phenolic cage material offers excellent dimensional stability across the operating temperature range of -30°C to 110°C, maintaining performance under thermal stress.
71803 ACD/P4DBAVR521 Bearing Typical Application Areas
This precision duplex bearing is engineered for high-performance applications where accuracy, speed, and rigidity are paramount. Key industries and equipment include:
- High-Frequency Spindles: CNC machining centers, PCB drilling machines, and precision grinders.
- Precision Instrumentation: Optical encoders, measuring devices, and laboratory equipment.
- High-Speed Automation: Robotics, pick-and-place units, and high-speed conveyor drives.
