71920 ACE/HCP4ADT
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71920 ACE/HCP4ADT
Basic Information
System of measurement
Metric
Weight
1.3 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
12.7 mm
Ball quantity
24
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
13612 lbf
Radial static load rating
13500 lbf
Limiting speed
15 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Duplex Tandem (DT)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
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
In Stock
Price available upon request.
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71920 ACE/HCP4ADT Bearing Product Overview & Core Advantages
The 71920 ACE/HCP4ADT is a duplex tandem (DT) arrangement of two super-precision angular contact ball bearings. This configuration is engineered to deliver exceptional axial rigidity and is optimized for applications requiring the highest levels of rotational accuracy and dimensional stability. Preloaded from the manufacturer, this matched set is ready for installation, ensuring reliable performance in demanding, high-speed environments.
71920 ACE/HCP4ADT Bearing Model Code Explained, Specifications & Naming Convention
| 71920 | Basic bearing series and size designation (Bore: 100mm, OD: 140mm, Width: 20mm per bearing). |
| ACE | A: 25° contact angle. C: Ceramic balls (Silicon Nitride). E: Optimized internal geometry for high-speed operation. |
| HC | Phenolic (Polyamide) cage. This lightweight, robust cage material is ideal for high-speed applications. |
| P4A | Indicates an ultra-high precision tolerance class (superior to ABEC 7/ISO P4), ensuring minimal runout and vibration. |
| DT | Duplex Tandem arrangement. Two bearings are mounted together to share the load and provide maximum axial load capacity in one direction. |
71920 ACE/HCP4ADT Bearing Structural Features & Performance Benefits
- Super-Precision & High Rigidity: The P4A tolerance class and duplex tandem preload deliver exceptional running accuracy and system stiffness, critical for minimizing deflection under heavy loads.
- Enhanced High-Speed Capability: The combination of ceramic balls (lower density, reduced centrifugal force) and a lightweight phenolic cage allows for a very high limiting speed of 15,000 rpm.
- Superior Load Capacity: The 25° contact angle and tandem arrangement are specifically designed to handle significant axial loads while also supporting substantial radial loads.
- Reduced Friction and Heat Generation: Ceramic balls have a lower coefficient of thermal expansion and superior lubrication properties compared to steel, leading to lower operating temperatures and longer lubricant life.
- Pre-Lubricated for Immediate Use: The bearings are factory-lubricated, ensuring optimal performance from the first rotation and simplifying the installation process.
71920 ACE/HCP4ADT Bearing Typical Application Areas
The 71920 ACE/HCP4ADT is ideally suited for the most demanding applications in:
- High-Speed Machine Tool Spindles (milling, grinding, drilling)
- Precision Robotic Drives and high-accuracy rotary tables
- Aerospace & Defense Systems (gyroscopes, radar platforms)
- Medical Equipment (dental handpieces, high-speed centrifuges)
- Semiconductor Manufacturing Equipment (wafer handling, stepper stages)
