71908 ACD/TBTG16VQ253
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71908 ACD/TBTG16VQ253
Basic Information
System of measurement
Metric
Weight
0.33 kg
Tolerance class
P4A
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
36 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
5648 lbf
Radial static load rating
5400 lbf
Limiting speed
41 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Triplex Back-to-Back (TBT)
Number of bearings in matched set
3
Universal matching bearing
No (Standard)
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 ACD/TBTG16VQ253 Bearing Product Overview & Core Advantages
The 71908 ACD/TBTG16VQ253 is a precision angular contact ball bearing configured in a triplex back-to-back (TBT) matched arrangement. This advanced configuration delivers exceptional system rigidity and is engineered to handle complex combined loads, including significant radial and bidirectional axial loads. Manufactured to P4A super-precision tolerance standards with a 25° contact angle, it is optimized for applications demanding high rotational accuracy, superior running stability, and long-term reliability in demanding operational environments.
71908 ACD/TBTG16VQ253 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71908 | Basic bearing series and size designation. |
| ACD | Angular Contact Design with a 25° contact angle. |
| TBT | Triplex Back-to-Back matched set. Three bearings are pre-matched for optimal load sharing and system stiffness. |
| G16 | Specifies a specific preload level applied to the matched set, ensuring precise internal clearance for high rigidity. |
| V | Indicates the cage material is Phenolic, offering excellent strength-to-weight ratio and smooth operation at high speeds. |
| Q253 | Denotes a specific lubrication type and quantity, ensuring optimal performance within the specified temperature range. |
71908 ACD/TBTG16VQ253 Bearing Structural Features & Performance Benefits
- Exceptional Rigidity and Stability: The triplex back-to-back (TBT) arrangement creates a highly rigid bearing system that effectively resists moment loads and shaft deflection, making it ideal for precision spindles.
- Superior Load Capacity: The combination of three bearings allows for a high dynamic and static load rating, capable of handling demanding combined radial and axial loads.
- High-Speed Capability: The lightweight phenolic cage (V) minimizes centrifugal forces, while the precision-ground chrome steel balls and optimized internal geometry contribute to a high limiting speed of 41,000 rpm.
- Precision Performance: Manufactured to P4A tolerance class, this bearing ensures minimal runout and vibration, which is critical for achieving high surface finishes and machining accuracy.
- Optimized Preload: The factory-set preload (G16) eliminates internal clearance, maximizing system stiffness and rotational accuracy without requiring complex on-site adjustment.
71908 ACD/TBTG16VQ253 Bearing Typical Application Areas
This bearing is specifically designed for high-performance applications where maximum rigidity, speed, and precision are paramount. Key industries and machinery include:
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and milling heads.
- Precision Rotary Systems: Industrial robotics, rotary tables, and indexing heads.
- High-Frequency Motors: Spindles for PCB drilling and other high-RPM electric motors.
- Aerospace & Defense Systems: Gyroscopes, radar equipment, and other critical navigation and control systems.
