71908 ACDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71908 ACDGA/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
25 °
Ball & Washer Dimensions
Ball diameter
6.35 mm
Ball quantity
21
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
2632 lbf
Radial static load rating
1800 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
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71908 ACDGA/HCP4A Bearing Product Overview & Core Advantages
The 71908 ACDGA/HCP4A is a single-row angular contact ball bearing engineered for applications demanding high precision and superior rotational accuracy. Operating under the stringent P4A tolerance class, this bearing is designed to handle primarily axial loads in one direction, as well as combined radial and axial loads. Its core advantages stem from its ceramic ball material and phenolic cage, which contribute to high-speed capability, reduced weight, and excellent performance in demanding operational environments. The extra light preload (Class A) ensures smooth, precise operation with minimal deflection, making it ideal for high-rigidity, high-speed spindles.
71908 ACDGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Model Segment | Technical Meaning |
|---|---|
| 71908 | Basic bearing designation, indicating a metric, single-row angular contact ball bearing with a 40mm bore. |
| AC | Angular Contact design with a 25° contact angle. |
| DGA | Universal Matchable (SU) bearing. Can be mounted in tandem, back-to-back, or face-to-face arrangements with other bearings from the same manufacturing lot to optimize preload and system rigidity. |
| HCP4A | Combined suffix indicating P4A tolerance class (very high precision) and a phenolic resin cage. |
71908 ACDGA/HCP4A Bearing Structural Features & Performance Benefits
- High-Speed & High-Rigidity Performance: The combination of ceramic balls (silicon nitride) and a lightweight phenolic cage significantly reduces centrifugal forces, enabling a high limiting speed of 41,000 rpm. This design ensures low heat generation and stable operation at high velocities.
- Superior Precision & Load Capacity: Manufactured to P4A tolerance class with tight dimensional and running accuracy tolerances. The 25° contact angle provides excellent axial load capacity while maintaining good radial load handling. The extra light preload minimizes axial and radial play, enhancing system rigidity and positioning accuracy.
- Universal Matching Capability: As a Universal Matchable (SU) bearing, it can be supplied in sets of three (as per specification) for precise matched arrangements. This allows for optimal preload control in multi-bearing configurations, critical for achieving maximum system stiffness and performance.
- Material Advantages: The chrome steel rings provide high durability and fatigue resistance, while the ceramic balls offer electrical insulation, corrosion resistance, and a longer service life under high-speed conditions.
71908 ACDGA/HCP4A Bearing Typical Application Areas
This high-precision, high-speed bearing is ideally suited for:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers requiring extreme precision and rigidity.
- Precision Instrumentation: Applications in medical devices, optical scanners, and measuring equipment.
- High-Frequency Motors & Spindles: Electric motor spindles and other high-RPM direct-drive systems.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other critical rotational components.
