71920 ACE/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71920 ACE/HCP4A
Basic Information
System of measurement
Metric
Weight
0.65 kg
Tolerance class
P4 (ABEC-7)
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
100 mm
Bore diameter tolerance
-0.008mm to 0
Outside diameter
140 mm
Outside diameter tolerance
-0.009mm to 0
Width
20 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
12.7 mm
Ball quantity
24
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
8348 lbf
Radial static load rating
6750 lbf
Limiting speed
22 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Preload
Available
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 1309.81
/ each
In Stock
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71920 ACE/HCP4A Bearing Product Overview & Core Advantages
The 71920 ACE/HCP4A is a single-row angular contact ball bearing engineered for applications demanding high precision and superior performance. Its defining characteristic is the 25° contact angle, which is optimized to support significant combined loads—handling both radial and axial forces simultaneously with high efficiency. Manufactured to a P4 (ABEC-7) tolerance class, it guarantees exceptional running accuracy. The combination of a phenolic cage and ceramic balls contributes to its high-speed capabilities, low friction, and long service life, making it a compact and reliable solution for the most demanding machinery.
71920 ACE/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Suffix | Technical Meaning | Benefit |
|---|---|---|
| ACE | Angular Contact, 25° contact angle | Optimized for handling high axial loads in one direction in combination with radial loads. |
| HC | Hybrid Ceramic (Ceramic balls, steel rings) | Enables higher speeds, reduces friction and heat generation, and increases bearing life. |
| P4A | P4 Tolerance Class, ABEC-7 | Guarantees ultra-precise dimensions and run-out for applications requiring extreme accuracy and smooth operation. |
71920 ACE/HCP4A Bearing Structural Features & Performance Benefits
- High-Speed Performance: The lightweight phenolic resin cage and low-density ceramic (Si3N4) balls significantly reduce centrifugal forces, allowing the bearing to achieve a high limiting speed of 22,000 rpm. This hybrid construction also minimizes friction and heat buildup.
- High Rigidity & Load Capacity: The 25° contact angle and robust internal geometry provide high axial and radial stiffness. With a dynamic load rating of 8348 lbf and a static load rating of 6750 lbf, it is built to handle demanding combined loads.
- Precision & Accuracy: Manufactured to P4 tolerance with tight dimensional controls on the bore, outside diameter, and width, this bearing ensures minimal vibration and precise shaft positioning.
- Preload & Matched Arrangements: The bearing is supplied preloaded and as a single unit, ready for installation to provide immediate system rigidity and eliminate internal clearance, which is critical for high-precision spindles.
71920 ACE/HCP4A Bearing Typical Application Areas
This high-performance angular contact ball bearing is ideally suited for:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy rotary axes.
- Aerospace & Defense Systems: Gyroscopes, radar platforms, and auxiliary power units.
- High-Frequency Motors and Spindles: Where low inertia and high rotational accuracy are paramount.
