71913 CD/P4ATBTC
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71913 CD/P4ATBTC
Basic Information
System of measurement
Metric
Weight
0.63 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
65 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
90 mm
Outside diameter tolerance
-0.004mm to 0
Width
39 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
7.938 mm
Ball quantity
26
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
9945 lbf
Radial static load rating
11475 lbf
Limiting speed
31 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
Moderate / Class C
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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71913 CD/P4ATBTC Bearing Product Overview & Core Advantages
The 71913 CD/P4ATBTC is a precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. As part of a triplex back-to-back (TBT) matched set, this bearing configuration delivers superior high rigidity and stability, enabling it to handle significant combined loads (radial and axial) simultaneously. Manufactured to P4A tolerance class and featuring a moderate preload (Class C), it is engineered for high-speed operation and long-term reliability in precision machinery.
71913 CD/P4ATBTC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71913 | Basic bearing series and size designation (65mm bore, 90mm OD, 39mm width). |
| CD | Specific internal design and contact angle (15° contact angle). |
| P4A | High precision tolerance class for superior running accuracy. |
| TBT | Triplex Back-to-Back arrangement of three matched bearings for maximum rigidity. |
| C | Moderate preload grade for optimized stiffness and high-speed performance. |
71913 CD/P4ATBTC Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The triplex back-to-back (TBT) matched arrangement creates a highly rigid bearing system that effectively resists moment loads and shaft deflection, making it ideal for applications requiring extreme positional accuracy.
- Superior Load Capacity: The angular contact design with a 15° contact angle is optimized to support substantial combined radial and axial loads.
- High-Speed Capability: The lightweight phenolic cage and precision-ground chrome steel components contribute to low friction and smooth operation, enabling a high limiting speed of 31,000 rpm.
- Precision Performance: Manufactured to P4A tolerance class with tight dimensional controls on the bore, outside diameter, and width, ensuring consistent, high-precision performance in the most demanding spindle applications.
71913 CD/P4ATBTC Bearing Typical Application Areas
This bearing is specifically engineered for high-performance applications where precision, speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling machines and high-frequency motor spindles.
- Robotics: High-accuracy robotic arms and joints.
- Aerospace & Defense: Gyroscopes, navigation systems, and other critical instrumentation.
