71902 ACDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71902 ACDGA/HCP4A
Basic Information
System of measurement
Metric
Weight
0.014 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
15 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
28 mm
Outside diameter tolerance
-0.004mm to 0
Width
7 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
3.969 mm
Ball quantity
13
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
848 lbf
Radial static load rating
405 lbf
Limiting speed
95 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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71902 ACDGA/HCP4A Bearing Product Overview & Core Advantages
The 71902 ACDGA/HCP4A is a single-row angular contact ball bearing designed for applications demanding high precision and exceptional performance. Engineered to primarily accommodate combined loads (radial and axial) in one direction, this bearing features a 25° contact angle for optimal axial load capacity. Its P4A tolerance class ensures ultra-precise running accuracy, making it ideal for high-speed spindles and precision machinery. The combination of a ceramic ball material and phenolic cage contributes to its high-speed capabilities, low friction, and extended service life.
71902 ACDGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71902 | Basic bearing series and size designation (15mm bore, 28mm OD). |
| AC | Angular Contact design with a 25° contact angle. |
| D | High ball diameter and quantity for increased load capacity. |
| GA | Indicates a specific internal clearance and preload group (Extra light / Class A). |
| HCP4A | Denotes Universal Matchable (SU) bearings supplied in a set of 3, manufactured to P4A tolerance class for superior running accuracy. |
71902 ACDGA/HCP4A Bearing Structural Features & Performance Benefits
- High-Speed & Low Friction: The use of ceramic balls significantly reduces centrifugal forces and friction, enabling a high limiting speed of 95,000 rpm. The lightweight phenolic cage further enhances high-speed stability and reduces inertia.
- Superior Precision & Rigidity: Manufactured to P4A tolerance class with tight dimensional tolerances on the bore diameter, outside diameter, and width, this bearing provides exceptional running accuracy and system rigidity for demanding applications.
- Optimized Load Capacity: The 25° contact angle and optimized internal geometry, including a larger ball diameter and quantity (13 balls), provide excellent radial dynamic load rating (848 lbf) and axial load capacity.
- Universal Matching & Preload: As part of the HCP4A universal matching set, these bearings can be mounted in pairs (back-to-back, face-to-face, or tandem) to accommodate complex load conditions. The extra light preload (Class A) minimizes deflection under high-speed operation.
71902 ACDGA/HCP4A Bearing Typical Application Areas
This high-precision angular contact ball bearing is ideally suited for:
- Machine Tool Spindles: High-speed machining centers, grinding spindles.
- Precision Instrumentation: Measuring devices, optical scanners.
- High-Speed Motors: Servo motors, spindle motors.
- Aerospace & Defense Systems: Gyroscopes, navigation systems.
