71812 ACDGA/HCP4
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71812 ACDGA/HCP4
Basic Information
System of measurement
Metric
Weight
0.088 kg
Tolerance class
P4
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
60 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
78 mm
Outside diameter tolerance
-0.004mm to 0
Width
10 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
5.556 mm
Ball quantity
28
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
2858 lbf
Radial static load rating
3015 lbf
Limiting speed
33 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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71812 ACDGA/HCP4 Bearing Product Overview & Core Advantages
The 71812 ACDGA/HCP4 is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. This single bearing features an Extra light (Class A) preload and is manufactured to P4 tolerance class, ensuring minimal runout and superior rotational accuracy. Its 25° contact angle is optimized to handle significant combined loads—both radial and axial. The use of ceramic balls and a phenolic cage contributes to its capabilities as a high-speed bearing, offering reduced weight, lower friction, and extended service life in high-velocity environments.
71812 ACDGA/HCP4 Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| AC | Angular Contact design with a 25° contact angle. |
| D | Optimized internal geometry for high-speed operation. |
| GA | Universal Matchable (SU) bearing, supplied in a set of 3 for precise preload arrangement. |
| HC | Hybrid Ceramic construction, featuring ceramic balls for enhanced performance. |
| P4 | P4 tolerance class, denoting very high dimensional and running accuracy. |
71812 ACDGA/HCP4 Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The combination of chrome steel rings and ceramic balls significantly reduces friction and heat generation, enabling higher limiting speeds (33,000 rpm) and providing electrical insulation. This makes it an ideal high-speed bearing.
- High Rigidity & Load Capacity: The 25° contact angle and precision-ground raceways provide excellent stiffness, allowing the bearing to effectively support combined radial and axial loads.
- Precision & Stability: Manufactured to P4 tolerance class with an Extra light preload, this bearing ensures minimal deflection and vibration, which is critical for maintaining precision in high-speed spindles.
- Phenolic Cage: The lightweight and robust phenolic resin cage offers superior guidance at high speeds, contributing to smooth operation and reduced centrifugal forces.
- Pre-lubricated: Comes lubricated for immediate use, suitable for its specified temperature range of -30°C to 110°C.
71812 ACDGA/HCP4 Bearing Typical Application Areas
This bearing is engineered for high-performance machinery where precision, speed, and reliability are paramount. Key applications include:
- Machine Tool Spindles: High-speed machining centers and grinding spindles.
- Precision Instrumentation: Measuring devices and laboratory equipment.
- High-Frequency Motors: Spindles for PCB drilling and dental handpieces.
- Aerospace & Defense Systems: Gyroscopes, navigation systems, and other critical rotating assemblies.
