71908 CD/P4ATBTA
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71908 CD/P4ATBTA
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
15 °
Ball & Washer Dimensions
Ball diameter
6.35 mm
Ball quantity
21
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
5962 lbf
Radial static load rating
5738 lbf
Limiting speed
56 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
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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71908 CD/P4ATBTA Bearing Product Overview & Core Advantages
The 71908 CD/P4ATBTA is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. This bearing features a triplex back-to-back (TBT) matched arrangement, providing superior stability and the ability to withstand combined loads (radial and axial). Manufactured to P4A tolerance class, it ensures minimal runout and high operational consistency, making it ideal for high-speed, high-precision machinery where reliability is paramount.
71908 CD/P4ATBTA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71908 | Basic bearing series and size designation (40mm bore, 62mm OD, 36mm width). |
| CD | Specifies a 15° contact angle and optimized internal geometry. |
| P4A | Indicates high-precision tolerance class (superior to ABEC 7), ensuring tight dimensional and running accuracy. |
| TBT | Denotes Triplex Back-to-Back matched set arrangement of three bearings. |
| A | Signifies an Extra Light preload for minimal friction and optimal high-speed performance. |
71908 CD/P4ATBTA Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The triplex back-to-back arrangement creates a wide, rigid support system that effectively resists moment loads and shaft deflection, crucial for maintaining precision under heavy combined loads.
- Superior Load Capacity: The angular contact design with a 15° contact angle is engineered to handle significant radial and axial loads simultaneously.
- Optimized High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, while the extra light preload minimizes heat generation, together enabling a high limiting speed of 56,000 rpm.
- Precision Engineering: Manufactured to P4A tolerance class with tight bore, outside diameter, and width tolerances, this bearing guarantees exceptional running accuracy and consistent performance in the most demanding applications.
71908 CD/P4ATBTA Bearing Typical Application Areas
This bearing is specifically engineered for high-performance machinery, including:
- Machine Tool Spindles (High-speed milling, grinding, and turning centers)
- Precision Grinding Spindles
- High-Frequency Motors
- Aerospace Control Systems
- Other equipment requiring ultra-precise, high-rigidity, and high-speed rotational elements.
