71908 CDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71908 CDGA/HCP4A
Basic Information
System of measurement
Metric
Weight
0.1 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
40 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
62 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
21
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
2790 lbf
Radial static load rating
1912 lbf
Limiting speed
56 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 71908 CDGA/HCP4A is a high-precision angular contact ball bearing designed for applications demanding exceptional accuracy and performance. This single bearing features an extra light preload (Class A) and is manufactured to P4A tolerance class, ensuring minimal runout and superior rotational precision. Its 15° contact angle is optimized to handle combined loads, efficiently supporting substantial 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 machinery.
71908 CDGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| 71908 C | Bearing series and size designation (40mm bore, 62mm OD, 12mm width). |
| DGA | Contact angle of 15° and specific internal design. |
| HC | Indicates the use of Hybrid Ceramic balls (Ceramic balls with steel rings). |
| P4A | Denotes a high-precision tolerance class, superior to ABEC 7. |
Structural Features and Performance Benefits
- High-Speed Performance: The combination of a lightweight phenolic resin cage and low-density ceramic (Si3N4) balls significantly reduces centrifugal forces, enabling a high limiting speed of 56,000 rpm.
- Rigidity and Accuracy: Manufactured to P4A precision tolerances with an extra light preload, this bearing provides high system rigidity, minimizes deflection under load, and ensures precise shaft positioning.
- Extended Service Life and Reliability: Ceramic balls are harder, lighter, and more resistant to wear and corrosion than steel balls. They also provide electrical insulation, reducing the risk of damage from electrical arcing.
- Thermal Stability: The phenolic cage and ceramic balls exhibit excellent dimensional stability across the operating temperature range of -30°C to 110°C.
- Universal Matching: Designated as Universal Matchable (SU), these bearings can be universally paired in any combination to form a matched set, simplifying mounting and ensuring optimal preload and performance.
71908 CDGA/HCP4A Bearing Typical Application Areas
This high-performance bearing is specifically engineered for demanding applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy rotary axes.
- High-Frequency Motors and Spindles: PCB drilling spindles and dental handpieces.
- Aerospace and Defense Systems: Gyroscopes, radar systems, and navigation equipment.
- Medical Equipment: Centrifuges and high-speed imaging scanners.
