71920 ACB/HCP4ADGA
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71920 ACB/HCP4ADGA
Basic Information
System of measurement
Metric
Weight
1.6 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
40 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
7.938 mm
Ball quantity
37
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
7470 lbf
Radial static load rating
9562 lbf
Limiting speed
15 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Universal Matchable (SU)
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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71920 ACB/HCP4ADGA Bearing Product Overview & Core Advantages
The 71920 ACB/HCP4ADGA is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. This universal matchable bearing features a ceramic ball construction and P4A super-precision tolerance, making it ideal for high-speed spindles and other precision machinery. Its key advantage lies in its ability to handle combined loads (radial and axial) simultaneously with high rigidity and minimal thermal expansion, ensuring superior operational reliability and longevity in critical applications.
71920 ACB/HCP4ADGA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71920 | Basic bearing series and size designation (100mm bore, 140mm OD, 40mm width) |
| ACB | Angular Contact Bearing with a 25° contact angle |
| HCP4A | Hybrid Ceramic (Silicon Nitride) balls with P4A super-precision tolerance |
| DGA | Universal Matchable (SU) arrangement, supplied as a pre-set duplex pair |
71920 ACB/HCP4ADGA Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Design: The use of ceramic balls significantly reduces friction, heat generation, and wear, enabling higher limiting speeds (15,000 rpm) and extended service life compared to all-steel bearings.
- Super-Precision P4A Tolerance: Extremely tight dimensional and running accuracy ensures minimal vibration and superior rotational precision for critical high-speed applications.
- Phenolic Resin Cage: Offers excellent dimensional stability, low weight, and smooth operation at high speeds, contributing to the bearing's overall high-speed performance.
- Universal Matchability (SU): Bearings are supplied as a pre-matched set (2 bearings) with controlled preload (Extra light / Class A), allowing for simplified installation and optimal stiffness and running accuracy.
- High Load Capacity: With a dynamic load rating of 7470 lbf and static load rating of 9562 lbf, it reliably handles significant combined radial and axial loads.
71920 ACB/HCP4ADGA Bearing Typical Application Areas
This bearing is engineered for high-performance applications where speed, precision, and reliability are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy positioning systems.
- Aerospace & Defense: Gyroscopes, navigation systems, and auxiliary power units.
- Medical Equipment: High-speed dental handpieces and surgical drill spindles.
- Semiconductor Manufacturing: Wafer handling robots and precision stages.
