71917 ACD/P4ATBTB
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71917 ACD/P4ATBTB
Basic Information
System of measurement
Metric
Weight
1.59 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
85 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
120 mm
Outside diameter tolerance
-0.004mm to 0
Width
54 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
11.112 mm
Ball quantity
25
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
21060 lbf
Radial static load rating
30825 lbf
Limiting speed
28 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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71917 ACD/P4ATBTB Bearing Product Overview & Core Advantages
The 71917 ACD/P4ATBTB represents a premium triplex matched angular contact ball bearing system engineered for applications demanding exceptional precision and rigidity. This P4A super-precision grade bearing is configured in a back-to-back (TBT) arrangement, delivering superior stability and moment load capacity. Its primary advantage lies in its ability to handle combined loads—significant radial and axial loads in both directions—simultaneously, making it ideal for high-speed, high-rigidity spindles. The light preload (Class B) ensures minimal deflection under operational stresses, while the phenolic cage facilitates smooth operation at the specified limiting speed.
71917 ACD/P4ATBTB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71917 | Basic bearing series, indicating a high-precision angular contact design with an 85 mm bore. |
| ACD | Angular Contact Design with a 25° contact angle, optimized for high axial load capacity. |
| P4A | The tolerance class, denoting super-precision levels for running accuracy and dimensional stability. |
| TBT | Triplex Back-to-Back matched set arrangement. This configuration provides high system rigidity and excellent resistance to moment loads. |
71917 ACD/P4ATBTB Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The triplex back-to-back configuration creates a highly rigid bearing system capable of withstanding complex combined loads. With a radial dynamic load rating of 21,060 lbf and a static load rating of 30,825 lbf, it ensures reliable performance under demanding conditions.
- Optimized for High-Speed Operation: The lightweight phenolic cage minimizes centrifugal forces, contributing to stable operation at the specified limiting speed of 28,000 rpm. The 25° contact angle provides an optimal balance between radial and axial load capacity for high-speed applications.
- Precision Engineering: Manufactured to P4A tolerance class with tight dimensional controls on the bore diameter, outside diameter, and width, this bearing guarantees exceptional running accuracy and minimal vibration.
- Superior Material Construction: Both the rings and balls are made from chrome steel, offering high hardness, wear resistance, and long service life.
71917 ACD/P4ATBTB Bearing Typical Application Areas
This precision triplex matched bearing is specifically designed for high-performance machinery where extreme accuracy, rigidity, and speed are paramount. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling machines and high-frequency motor spindles.
- Industrial Pumps & Compressors: Applications requiring precise shaft positioning and high axial stiffness.
