71917 CD/P4AQBCA
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71917 CD/P4AQBCA
Basic Information
System of measurement
Metric
Weight
2.12 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
72 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
11.112 mm
Ball quantity
25
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
27900 lbf
Radial static load rating
43425 lbf
Limiting speed
17 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Quadruplex Back-to-Back (QBC)
Number of bearings in matched set
4
Universal matching bearing
No (Standard)
Preload
Extra light / Class A
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 CD/P4AQBCA Bearing Product Overview & Core Advantages
The 71917 CD/P4AQBCA is a precision quadruplex angular contact ball bearing designed for applications requiring exceptional rigidity and accuracy. This metric system bearing features an Extra Light preload (Class A) and is supplied as a matched set of four bearings in a Back-to-Back (QBC) arrangement. This configuration provides superior stiffness and is optimized to handle combined radial and axial loads simultaneously. Manufactured to P4A tolerance class, it delivers high running accuracy, making it ideal for demanding, high-precision machinery.
71917 CD/P4AQBCA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71917 | Basic bearing series and size designation (85mm bore, 120mm OD). |
| C | Specific internal design and 15° contact angle. |
| D | Indicates a matched bearing set. |
| P4A | High-Precision Tolerance Class, specifying very tight dimensional and running accuracy. |
| QBC | Quadruplex Back-to-Back arrangement. Four bearings are matched and preloaded in a back-to-back configuration. |
71917 CD/P4AQBCA Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The quadruplex back-to-back (QBC) arrangement creates a highly rigid bearing system capable of supporting significant combined loads and moments. The 15° contact angle is optimized for handling axial loads in addition to radial loads.
- Precision Performance: Manufactured to P4A tolerance class with extremely tight bore and outside diameter tolerances, this bearing ensures minimal runout and high positional accuracy for precision applications.
- High-Speed Capability: The lightweight phenolic cage reduces centrifugal forces, contributing to a high limiting speed of 17,000 rpm. The open design and pre-lubrication facilitate efficient heat dissipation.
- Durable Construction: Components are made from chrome steel for high load ratings (Cr = 27,900 lbf, C0r = 43,425 lbf) and long service life. The set is pre-lubricated for immediate installation and initial operation.
71917 CD/P4AQBCA Bearing Typical Application Areas
This bearing is engineered for high-performance applications, including:
- Machine Tool Spindles (e.g., grinding, milling, and turning centers)
- High-Speed Precision Drives
- Industrial Pumps and Compressors
- Robotic Arms and Precision Positioning Systems
