71920 CE/P4A
71900 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
71920 CE/P4A
Basic Information
System of measurement
Metric
Weight
0.77 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
15 °
Ball & Washer Dimensions
Ball diameter
12.7 mm
Ball quantity
24
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
8775 lbf
Radial static load rating
7088 lbf
Limiting speed
20.5 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Preload
Available
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 1310.01
/ each
In Stock
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71920 CE/P4A Bearing Product Overview & Core Advantages
The 71920 CE/P4A is a single-row angular contact ball bearing designed for applications requiring exceptional precision and high-speed performance. Engineered to P4 (ABEC-7) tolerance class, it delivers superior running accuracy and rotational stability. Its primary advantage lies in its ability to accommodate combined loads, efficiently handling both radial and significant axial loads in one direction. The bearing comes preloaded from the factory, ensuring immediate high rigidity and minimal axial play, making it ideal for high-precision, high-reliability machine tool spindles and other precision equipment.
71920 CE/P4A Bearing Model Code Explained, Specifications & Naming Convention
The model number 71920 CE/P4A provides detailed technical specifications. Below is a breakdown of its components:
- 71920: Basic bearing series, indicating a metric, single-row angular contact design with a 100mm bore, 140mm OD, and 20mm width.
- C: Denotes a 15° contact angle, optimized for high-speed operation and moderate axial load capacity.
- E: Indicates an optimized internal design, featuring a larger ball complement and reinforced shoulders for increased load capacity.
- P4A: Specifies the tolerance class. P4 is equivalent to ABEC-7, representing a very high precision grade. The "A" suffix indicates a specific dimensional and running accuracy that is consistent and guaranteed.
71920 CE/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The P4 tolerance class and factory-applied preload eliminate internal clearance, providing exceptional system stiffness and precise shaft positioning, which is critical for machining accuracy.
- Superior Load Capacity: The "E" type internal design incorporates more and larger balls (24 balls, 12.7 mm diameter), significantly boosting the dynamic and static load ratings (8775 lbf / 7088 lbf) compared to standard designs.
- High-Speed Performance: The 15° contact angle and lightweight phenolic resin cage reduce centrifugal forces and friction, enabling a high limiting speed of 20,500 rpm. The cage ensures stable ball guidance and is suitable for high rotational speeds.
- Material Integrity: Constructed from chrome steel for both rings and balls, the bearing offers high hardness, wear resistance, and a long operational life, especially within its specified temperature range of -30°C to 110°C.
71920 CE/P4A Bearing Typical Application Areas
This high-precision angular contact bearing is ideally suited for demanding applications where speed, accuracy, and rigidity are paramount. Key industries and machinery include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling machines, high-frequency motor spindles.
- Robotics: High-accuracy joints and rotary actuators.
- Medical Equipment: Dental handpieces, centrifuges, and imaging devices.
- Aerospace & Defense: Gyroscopes, radar systems, and navigation instruments.
