71909 CDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71909 CDGA/HCP4A
Basic Information
System of measurement
Metric
Weight
0.12 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
45 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
68 mm
Outside diameter tolerance
-0.004mm to 0
Width
12 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
6.35 mm
Ball quantity
23
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
2925 lbf
Radial static load rating
2138 lbf
Limiting speed
41 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
No drawings available at the moment, will be launched soon
In Stock
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71909 CDGA/HCP4A Bearing Product Overview & Core Advantages
The 71909 CDGA/HCP4A is a single-row angular contact ball bearing engineered for ultra-high precision and high-speed applications. Positioned in the P4A tolerance class, it delivers exceptional dimensional accuracy and running precision. Its core advantage lies in its optimized design for handling combined radial and axial loads simultaneously, making it ideal for machine tool spindles and other demanding equipment requiring superior rotational accuracy and rigidity. The use of a phenolic cage and ceramic balls significantly contributes to its high-speed capability and reduced operational friction.
71909 CDGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning | Significance & Advantage |
|---|---|---|
| CDGA | Universal Matchable bearing set with 15° contact angle and Extra Light (A) preload. | Ensures optimal stiffness and minimal runout when mounted in a matched arrangement. The specific preload guarantees consistent performance under high-speed operation. |
| HCP4A | Hybrid Ceramic (Silicon Nitride) balls with P4A tolerance class. | Ceramic balls reduce centrifugal forces, lower friction, and allow for higher limiting speeds. The P4A tolerance ensures ultra-precise dimensions for critical applications. |
71909 CDGA/HCP4A Bearing Structural Features & Performance Benefits
- High-Speed Performance & Reduced Friction: The combination of a lightweight phenolic cage and ceramic balls minimizes inertial forces and heat generation, enabling a high limiting speed of 41,000 rpm.
- High Rigidity & Precision: Manufactured to P4A super-precision standards with tight tolerances on all dimensions. The 15° contact angle and extra light preload provide excellent rigidity for precise shaft positioning.
- Superior Load Capacity: Engineered to support significant combined radial and axial loads, with a dynamic load rating of 2925 lbf and a static load rating of 2138 lbf.
- Universal Matching Design: Designed as a Universal Matchable (SU) bearing, allowing for precise preload control and simplified installation when used in sets of two or more bearings.
- Wide Operating Range: Pre-lubricated and capable of operating within a temperature range of -30°C to 110°C, ensuring reliable performance in various environments.
71909 CDGA/HCP4A Bearing Typical Application Areas
This bearing is specifically designed for high-performance machinery where precision and speed are paramount. Key applications include:
- Machine Tool Spindles (High-speed milling, grinding)
- Precision Grinding Machines
- High-Frequency Motors
- Dental and Medical Handpieces
- Aerospace Instrumentation
