71920 CEGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71920 CEGA/HCP4A
Basic Information
System of measurement
Metric
Weight
0.65 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
100 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
140 mm
Outside diameter tolerance
-0.004mm to 0
Width
20 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
12.7 mm
Ball quantity
24
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
8775 lbf
Radial static load rating
7088 lbf
Limiting speed
16 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Number of bearings in matched set
2
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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71920 CEGA/HCP4A Bearing Product Overview & Core Advantages
The 71920 CEGA/HCP4A is a single-row angular contact ball bearing engineered for ultra-high precision applications. Positioned in the P4A super-precision tolerance class, it delivers exceptional rotational accuracy and running stability. Its key advantage lies in its ability to accommodate combined loads (radial and axial) simultaneously, making it ideal for machine tool spindles and other high-speed, high-rigidity systems. The combination of a ceramic ball material and a phenolic cage contributes to superior high-speed performance and reduced centrifugal forces.
71920 CEGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
The model number 71920 CEGA/HCP4A is decoded as follows:
- 71920: Basic bearing series, indicating a high-precision, light-weight angular contact design with a 100mm bore, 140mm OD, and 20mm width.
- C: Represents a 15° contact angle, optimized for high-speed operation with moderate axial load capacity.
- E: Indicates the bearing is manufactured with optimized internal geometry (internal design enhancements) for improved performance.
- GA: Signifies that the bearing is universally matchable and can be mounted in any combination (face-to-face, back-to-back, or tandem) with another identical bearing to achieve desired preload and stiffness.
- HCP4A: Denotes the tolerance class. "P4A" is a super-precision grade with very tight dimensional and running accuracy tolerances. The "HC" prefix may refer to a specific manufacturer's designation for this high-class series.
71920 CEGA/HCP4A Bearing Structural Features & Performance Benefits
- High Rigidity & Precision: Manufactured to P4A tolerance class, this bearing ensures minimal runout and vibration, providing the stiffness required for demanding applications like machining centers.
- Superior High-Speed Capability: The use of ceramic (Si3N4) balls significantly reduces centrifugal forces and friction, allowing for a higher limiting speed. The lightweight phenolic resin cage further enhances stability and performance at high rotational speeds.
- Optimized Load Capacity: The 15° contact angle is ideal for applications requiring high-speed operation with a combination of radial and axial loads. The extra light preload (Class A) minimizes friction at startup while ensuring shaft rigidity.
- Universal Matching Design: As a Universal Matchable (SU) bearing, it can be paired with another identical bearing in a set. This allows for simplified inventory and flexible mounting configurations to achieve specific preload and system stiffness.
71920 CEGA/HCP4A Bearing Typical Application Areas
This precision angular contact bearing is specifically designed for high-performance machinery, including:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers.
- Precision Grinding Spindles: Where extreme accuracy and smooth operation are critical.
- High-Frequency Motors and Spindles: Applications demanding minimal vibration and heat generation.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other precision instruments.
