71817 CD/HCP4DBA
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71817 CD/HCP4DBA
Basic Information
System of measurement
Metric
Weight
0.48 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
26 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
7898 lbf
Radial static load rating
11475 lbf
Limiting speed
28 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Duplex Back-to-Back (DB)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
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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71817 CD/HCP4DBA Bearing Product Overview & Core Advantages
The 71817 CD/HCP4DBA is a precision duplex angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. This matched back-to-back (DB) arrangement is preloaded to Extra Light / Class A specifications, ensuring optimal performance under combined radial and axial loads. Its construction with a phenolic cage and ceramic balls enables superior high-speed capabilities and thermal stability, making it ideal for high-precision, high-reliability machine tool spindles and other precision equipment.
71817 CD/HCP4DBA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning | Performance Implication |
|---|---|---|
| 71817 | Basic bearing series and size designation | Defines the core bearing dimensions (85mm bore, 110mm OD, 26mm width) |
| CD | Duplex Back-to-Back arrangement with specific preload | Provides high moment rigidity and precise shaft positioning |
| HC | Hybrid Ceramic (Silicon Nitride balls) | Enables higher speed, reduced heat generation, and longer service life |
| P4 | Tolerance class P4 (ABEC 7) | Guarantees ultra-precision running accuracy and dimensional consistency |
| DBA | Preload designation: Extra Light (Class A) | Optimizes performance for high-speed applications with minimal friction |
71817 CD/HCP4DBA Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex back-to-back (DB) arrangement creates a rigid bearing system capable of withstanding combined radial and axial loads from both directions, significantly improving system stability and accuracy.
- Superior High-Speed Performance: The combination of ceramic balls (lower density, reduced centrifugal force) and a lightweight phenolic cage allows for a limiting speed of 28,000 rpm, minimizing friction and heat generation at high velocities.
- Precision Engineering: Manufactured to P4 tolerance class with tight dimensional control on bore, outside diameter, and width, ensuring exact fit and minimal runout for precision applications.
- Optimized for Precision Applications: The 15° contact angle and extra light preload are specifically calibrated for applications requiring high rotational accuracy and rapid acceleration/deceleration.
71817 CD/HCP4DBA Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning centers requiring utmost precision and rigidity.
- Precision Rotary Systems
- High-Frequency Machining Spindles
- Medical & Dental Equipment Spindles
- Aerospace Test & Measurement Equipment
