71817 CDGA/HCP4
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71817 CDGA/HCP4
Basic Information
System of measurement
Metric
Weight
0.24 kg
Tolerance class
P4
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
85 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
110 mm
Outside diameter tolerance
-0.004mm to 0
Width
13 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
7.144 mm
Ball quantity
30
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
4860 lbf
Radial static load rating
5738 lbf
Limiting speed
28 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Number of bearings in matched set
4
Universal matching bearing
Universal Matchable (SU)
Preload
Extra light / Class A
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
In Stock
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71817 CDGA/HCP4 Bearing Product Overview & Core Advantages
The 71817 CDGA/HCP4 is a single-row angular contact ball bearing engineered for applications demanding ultra-high precision and superior performance. Positioned in the P4 tolerance class, it delivers exceptional dimensional accuracy and running precision. A key advantage is its universal matchability (SU designation), allowing bearings to be mounted in any combination (face-to-face, back-to-back, or tandem) to achieve specific stiffness and load-handling characteristics. The use of ceramic balls significantly reduces friction and heat generation, enabling higher limiting speeds and extended service life, especially in demanding environments.
71817 CDGA/HCP4 Bearing Model Code Explained, Specifications & Naming Convention
The model number 71817 CDGA/HCP4 provides a detailed technical specification:
- 71817: Basic bearing series and size designation (85mm bore, 110mm OD, 13mm width).
- C: Denotes a 15° contact angle, optimized for combined loads with a higher axial load capacity.
- DG: Signifies the bearing is Universal Matchable (SU) and supplied as part of a matched set.
- A: Indicates an Extra Light (Class A) preload, which minimizes runout and ensures high rotational accuracy from the start.
- HCP4: A composite suffix where HC likely refers to the Hybrid Ceramic construction (steel rings with ceramic balls), and P4 confirms the super-precision tolerance class.
71817 CDGA/HCP4 Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The combination of chrome steel rings and silicon nitride (Si3N4) ceramic balls results in lower density, reduced centrifugal forces, and superior electrical resistance. This directly contributes to higher speed capability, reduced operating temperature, and longer lubricant life.
- Precision & Rigidity: Manufactured to P4 tolerance standards with an extra light preload, this bearing provides exceptional running accuracy, minimal deflection, and high system rigidity, which is critical for spindle applications.
- High Load Capacity: The 15° contact angle is engineered to efficiently support combined radial and axial loads simultaneously. The phenolic resin cage is lightweight and robust, ensuring stable operation at high speeds.
- Matched Set Performance: Supplied as a universally matchable set of 4 bearings, they can be arranged to precisely control preload and stiffness, simplifying the design and assembly of complex spindle units.
71817 CDGA/HCP4 Bearing Typical Application Areas
This high-precision, high-speed bearing is ideally suited for the most demanding applications, including:
- High-Frequency Machine Tool Spindles: For CNC milling, grinding, and drilling centers where speed, accuracy, and rigidity are paramount.
- Precision Robotic Drives: In high-accuracy robotic arms and joints requiring minimal friction and high responsiveness.
- Aerospace & Defense Systems: In gyroscopes, navigation systems, and other critical components where reliability and performance under extreme conditions are essential.
- High-Speed Motors and Turbomachinery: Where the benefits of hybrid ceramic construction are leveraged for reduced energy loss and increased operational limits.
