71913 CD/P4ATBTB
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71913 CD/P4ATBTB
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
Light / Class B
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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In Stock
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71913 CD/P4ATBTB Bearing Product Overview & Core Advantages
The 71913 CD/P4ATBTB is a precision angular contact ball bearing configured in a triplex back-to-back (TBT) matched set. Engineered for applications demanding exceptional rotational accuracy and rigidity, this bearing set is designed to accommodate combined radial and axial loads simultaneously. Manufactured to a P4A tolerance class, it offers superior running accuracy, making it ideal for high-speed, high-precision machinery. The matched TBT arrangement provides outstanding system stability and moment load capacity.
71913 CD/P4ATBTB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71913 | Basic bearing designation, indicating a metric, angular contact bearing with a 65mm bore, 90mm OD, and 39mm width. |
| CD | Indicates a specific internal design and contact angle (15° in this case) optimized for high-speed operation and high rigidity. |
| P4A | Denotes a high-precision tolerance class with very tight dimensional and running accuracy tolerances, superior to ABEC-7. |
| TBT | Signifies a Triplex Back-to-Back matched arrangement. Three bearings are supplied as a pre-matched set, mounted back-to-back. |
71913 CD/P4ATBTB Bearing Structural Features & Performance Benefits
- High Rigidity & System Stability: The triplex back-to-back (TBT) configuration creates a highly rigid bearing system capable of withstanding significant moment loads and complex force combinations, ensuring minimal shaft deflection under load.
- Superior Load Capacity: The angular contact design with a 15° contact angle is optimized to handle substantial combined (radial and axial) loads. The matched set ensures even load distribution across all three bearings.
- High-Speed Capability: The lightweight, high-strength phenolic resin cage minimizes centrifugal forces, reduces friction, and contributes to a high limiting speed of 31,000 rpm. The open design facilitates efficient lubrication and cooling.
- Precision Performance: Manufactured to P4A tolerance class, this bearing guarantees extremely tight dimensional control and superior running accuracy, resulting in reduced vibration and enhanced machine performance.
- Optimized Material: Constructed from chrome steel for both rings and balls, providing high hardness, wear resistance, and a long operational life.
71913 CD/P4ATBTB Bearing Typical Application Areas
This bearing is specifically designed for high-performance applications requiring maximum precision and rigidity, including:
- Machine Tool Spindles (High-speed milling, grinding, and turning centers)
- Precision Gearboxes
- High-Frequency Motors and Spindles
- Aerospace Actuation Systems
- Medical and Laboratory Equipment
