71808 CD/P4TBTM
71800 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71808 CD/P4TBTM
Basic Information
System of measurement
Metric
Weight
0.093 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
52 mm
Outside diameter tolerance
-0.004mm to 0
Width
21 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
3.175 mm
Ball quantity
29
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
2340 lbf
Radial static load rating
3285 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
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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71808 CD/P4TBTM Bearing Product Overview & Core Advantages
The 71808 CD/P4TBTM is a precision angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This matched set bearing features a triplex back-to-back (TBT) arrangement, providing superior stability and the ability to withstand combined loads (radial and axial). Manufactured to P4 tolerance class, it ensures high running accuracy and is preloaded for immediate use in high-speed, high-rigidity systems.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 71808 | Basic bearing series and size designation (40mm bore, 52mm OD). |
| CD | Specifies a 15° contact angle and high-precision design. |
| P4 | Indicates tolerance class P4 for superior dimensional and running accuracy. |
| TBT | Denotes the bearing is part of a Triplex Back-to-Back matched set. |
| M | Signifies the bearing is pre-lubricated. |
71808 CD/P4TBTM Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The triplex back-to-back arrangement of three bearings creates an extremely rigid support system, effectively resisting complex moment loads and maintaining shaft positioning under severe operating conditions.
- Superior Load Capacity: The angular contact design with a 15° contact angle is engineered to handle significant combined radial and axial loads simultaneously.
- High-Speed Performance: The lightweight phenolic resin cage minimizes centrifugal forces, reduces friction, and contributes to a high limiting speed of 56,000 rpm, making it an ideal high-speed bearing.
- Precision & Reliability: Manufactured to P4 tolerance class with precise bearing dimensions and preload, this set guarantees smooth, quiet operation and long-term reliability in precision machinery.
71808 CD/P4TBTM Bearing Typical Application Areas
This bearing is specifically designed for high-performance applications, including:
- Machine Tool Spindles (High-speed milling, grinding)
- Precision Gearboxes
- High-Frequency Motors and Spindles
- Industrial Pumps and Compressors
- Aerospace and Defense Actuation Systems
