71913 ACD/P4ATBTB
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71913 ACD/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
25 °
Ball & Washer Dimensions
Ball diameter
7.938 mm
Ball quantity
26
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
9518 lbf
Radial static load rating
10800 lbf
Limiting speed
36 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
No drawings available at the moment, will be launched soon
In Stock
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71913 ACD/P4ATBTB Bearing Product Overview & Core Advantages
The 71913 ACD/P4ATBTB is a super-precision angular contact ball bearing designed for the most demanding applications requiring exceptional rotational accuracy and rigidity. This triplex back-to-back (TBT) matched set delivers superior stiffness and stability under complex combined loads, including high radial and thrust loads. Manufactured to P4A tolerance class, it ensures minimal runout and vibration, making it ideal for high-speed spindles and precision machinery where reliability is paramount.
71913 ACD/P4ATBTB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71913 AC | Basic bearing series with a 25° contact angle. |
| D | Indicates a modified internal design for optimized performance. |
| P4A | Denotes a super-precision tolerance class with enhanced dimensional and running accuracy. |
| TBT | Specifies a Triplex Back-to-Back matched arrangement of three bearings. |
71913 ACD/P4ATBTB 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, ensuring precise positioning and smooth operation.
- High Load Capacity: The 25° contact angle and robust construction enable the bearing to handle significant combined radial and axial loads simultaneously.
- Optimized High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, while the precision-ground chrome steel components and light preload (Class B) contribute to a high limiting speed of 36,000 rpm.
- Precision Engineering: Adherence to P4A tolerance standards guarantees tight control over bore diameter, outside diameter, and width, resulting in superior running accuracy for critical applications.
71913 ACD/P4ATBTB Bearing Typical Application Areas
This bearing is engineered for high-performance machinery where precision, speed, and rigidity are non-negotiable. Key applications include:
- Machine Tool Spindles (e.g., CNC milling, grinding, and turning centers)
- High-Frequency Machining Spindles
- Precision Grinding Equipment
- High-Speed Robotic Drives
- Aerospace Test Rigs
