71917 CDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71917 CDGA/HCP4A
Basic Information
System of measurement
Metric
Weight
0.45 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
18 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
10395 lbf
Radial static load rating
10800 lbf
Limiting speed
17 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Number of bearings in matched set
3
Universal matching bearing
Universal Matchable (SU)
Preload
Extra light / Class A
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
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In Stock
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Product Overview and Core Advantages
The 71917 CDGA/HCP4A is a high-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. This single bearing features an Extra Light (A) preload and a P4A super-precision tolerance class, ensuring minimal runout and vibration for superior performance. Its 15° contact angle is optimized to handle combined loads, efficiently supporting significant radial loads and axial loads in one direction. The use of a phenolic cage and ceramic balls contributes to its high-speed capability, low friction, and extended service life, making it ideal for high-reliability, high-speed spindles and precision machinery.
71917 CDGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
The model number 71917 CDGA/HCP4A decodes the bearing's specific technical features as follows:
- 71917: Basic bearing series and size designation (85mm bore, 120mm OD, 18mm width).
- C: 15° nominal contact angle.
- DG: Universal Matchable (SU) bearing. This bearing is supplied as part of a matched set of 3 bearings (DB/DF/DT arrangement) for optimal load distribution and system rigidity.
- A: Signifies Extra Light preload class, minimizing friction and heat generation at high speeds.
- HCP4A: Denotes the tolerance class P4A, indicating extremely tight dimensional and running accuracy tolerances superior to standard ABEC 7 / ISO P4.
Structural Features and Performance Benefits
- High Rigidity and Precision: The P4A tolerance class and controlled preload ensure maximum system stiffness and rotational accuracy, critical for machining and positioning applications.
- High-Speed Performance: The combination of ceramic balls (lower density, reduced centrifugal force) and a lightweight phenolic resin cage allows for a very high limiting speed of 17,000 rpm. This design minimizes friction and heat buildup.
- Superior Load Capacity: The angular contact design with a 15° contact angle provides excellent combined load carrying capacity, handling both radial and one-directional axial loads simultaneously.
- Matched Set Advantages: Supplied as a universally matchable set, these bearings can be arranged in tandem, back-to-back, or face-to-face configurations to meet specific application requirements for rigidity and moment load capacity.
- Wide Temperature Range: Suitable for operation within a temperature range of -30°C to 110°C.
71917 CDGA/HCP4A Bearing Typical Application Areas
This bearing is engineered for the most demanding high-precision and high-speed applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling and routing spindles.
- High-Frequency Motors: Spindles for integrally mounted motor applications.
- Aerospace and Defense Systems: Gyroscopes, radar systems, and other precision instrumentation.
