7217 CD/HCP4ADFB
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
7217 CD/HCP4ADFB
Basic Information
System of measurement
Metric
Weight
3.13 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
150 mm
Outside diameter tolerance
-0.004mm to 0
Width
56 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
19.05 mm
Ball quantity
17
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
36675 lbf
Radial static load rating
39600 lbf
Limiting speed
17 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Duplex Face-to-Face (DF)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
Preload
Light / Class B
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
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7217 CD/HCP4ADFB Bearing Product Overview & Core Advantages
The 7217 CD/HCP4ADFB is a precision duplex angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. This matched set features a Face-to-Face (DF) arrangement and is manufactured to the stringent P4A tolerance class. Its core advantages include the ability to support combined radial and axial loads simultaneously, superior high-speed performance enabled by a phenolic cage and ceramic balls, and high operational rigidity due to its duplex preloaded configuration. This bearing is pre-lubricated and optimized for high reliability in precision machinery.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 7217 | Basic bearing series and size designation (85 mm bore, 150 mm OD). |
| C | Specific internal design with a 15° contact angle. |
| D | Indicates a duplex (two bearings in a set) configuration. |
| HC | Hybrid Ceramic: Signifies the use of ceramic balls for reduced friction and higher speed capability. |
| P4A | The tolerance class, denoting very high precision levels for runout and dimensional accuracy. |
| DF | Matched arrangement: Duplex Face-to-Face. Optimized for applications requiring high rigidity and moment load capacity. |
| B | Specifies a Light preload for minimal bearing deflection and precise shaft positioning. |
7217 CD/HCP4ADFB Bearing Structural Features & Performance Benefits
- High Rigidity & Preload: The duplex Face-to-Face (DF) arrangement with a light preload (Class B) eliminates internal clearance, providing maximum system stiffness and precise rotational accuracy, which is critical for minimizing deflection under load.
- Superior High-Speed Performance: The combination of a lightweight phenolic cage and low-density, hard ceramic (Si3N4) balls significantly reduces centrifugal forces, enabling a high limiting speed of 17,000 rpm. This hybrid ceramic design also offers reduced heat generation and improved dynamic response.
- Exceptional Load Capacity: The angular contact design with a 15° contact angle is engineered to handle significant combined loads (radial and axial). The high-grade chrome steel rings provide a robust radial dynamic load rating of 36,675 lbf and a static load rating of 39,600 lbf.
- Precision & Longevity: Manufactured to ABEC 7 / P4A precision standards with tight dimensional tolerances, this bearing ensures smooth, quiet, and vibration-free operation. The open design, when used in a properly sealed environment, allows for optimized lubrication management, contributing to a long service life.
7217 CD/HCP4ADFB Bearing Typical Application Areas
The 7217 CD/HCP4ADFB is ideally suited for high-performance machinery where precision, speed, and rigidity are paramount. Key application fields include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles: Applications requiring ultra-fine surface finishes.
- High-Frequency Motors and Spindles: Used in PCB drilling and CNC routing.
- Industrial Pumps and Compressors: For efficient and reliable operation under demanding conditions.
- Advanced Robotics and Automation: Precision joints and arm linkages.
