71908/VA9D1
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71908/VA9D1
Basic Information
System of measurement
Metric
Weight
0.11 kg
Tolerance class
P4
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
40 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
62 mm
Outside diameter tolerance
-0.004mm to 0
Width
12 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
6.35 mm
Ball quantity
21
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
2632 lbf
Radial static load rating
1800 lbf
Limiting speed
41 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
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
In Stock
Price available upon request.
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71908/VA9D1 Bearing Product Overview & Core Advantages
The 71908/VA9D1 is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. Engineered to a P4 tolerance class, this bearing excels in handling combined radial and axial loads simultaneously. Its single-row design with a 25° contact angle is optimized for high-speed operation, with a limiting speed of 41,000 rpm. The bearing comes pre-lubricated and is part of a Universal Matchable (SU) set, allowing for precise preload configuration when mounted in pairs, making it an ideal solution for high-reliability, high-precision machinery.
71908/VA9D1 Bearing Model Code Explained, Specifications & Naming Convention
| Model Segment | Technical Meaning | Significance |
|---|---|---|
| 71908 | Basic bearing series and size code | Indicates a metric, single-row angular contact bearing with a 40mm bore, 62mm OD, and 12mm width. |
| VA9 | Preload designation | Specifies a light preload category, enhancing rigidity and minimizing deflection under operational loads. |
| D1 | Internal clearance / matching group | Identifies the bearing as part of a Universal Matchable (SU) set, ensuring predictable performance when paired. |
71908/VA9D1 Bearing Structural Features & Performance Benefits
- High Precision & Rigidity: Manufactured to P4 tolerance with a phenolic resin cage, this bearing ensures minimal runout and stable operation under high-speed and combined loads, providing superior system stiffness.
- Optimized Load Capacity: The 25° contact angle is engineered to efficiently support significant axial loads in one direction alongside radial loads, making it suitable for applications with demanding combined load requirements.
- Superior High-Speed Performance: The lightweight phenolic cage and optimized internal geometry contribute to low friction and low heat generation, enabling a high limiting speed of 41,000 rpm.
- Universal Matching Capability: As a Universal Matchable (SU) bearing, it can be paired with another identical bearing to create a preloaded set (DB, DF, or DT arrangement), simplifying assembly and ensuring consistent, high-performance operation.
71908/VA9D1 Bearing Typical Application Areas
- Machine Tool Spindles: For high-precision milling, grinding, and turning centers requiring exceptional accuracy and speed.
- High-Frequency Spindles: In PCB drilling and routing equipment where high RPM and rigidity are critical.
- Precision Gearboxes: Supporting shafts in high-performance automotive and industrial transmission systems.
- Robotic Arms and Actuators: Providing accurate and rigid rotational support in articulated joints.
