71920 ACE/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71920 ACE/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
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
18 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:
$ 1310.02
/ each
In Stock
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71920 ACE/P4A Bearing Product Overview & Core Advantages
The 71920 ACE/P4A is a single-row angular contact ball bearing engineered for applications demanding high precision and superior rotational accuracy. Positioned in the P4 (ABEC-7) tolerance class, it is designed to accommodate primarily axial loads in one direction and combined loads. Its compact design, featuring a 25° contact angle, provides excellent operational stability and is ideally suited for high-speed spindles and other precision machinery where rigidity and low operational noise are critical.
71920 ACE/P4A Bearing Model Code Explained, Specifications & Naming Convention
The model number 71920 ACE/P4A is decoded as follows:
- 71920: Denotes the bearing series and size. The '70' series is a high-precision angular contact design. '920' indicates a 100 mm bore, 140 mm OD, and 20 mm width.
- ACE: Represents specific internal design features optimized for high-speed performance and a 25° contact angle.
- P4A: Signifies the tolerance class P4 (ABEC-7), indicating very high dimensional and running accuracy. The 'A' suffix often denotes a specific internal clearance or preload category.
71920 ACE/P4A Bearing Structural Features & Performance Benefits
- High Precision & Rigidity: Manufactured to P4 tolerance class, this bearing ensures minimal runout and vibration, which is critical for applications like machine tool spindles. The 25° contact angle provides a robust balance between axial and radial load capacity, contributing to system rigidity.
- Optimized for High-Speed Operation: The lightweight and durable phenolic resin cage minimizes centrifugal forces, reduces friction, and allows for a high limiting speed of 18,000 rpm. This makes it an excellent high-speed bearing solution.
- Superior Load Capacity: With a dynamic load rating of 8348 lbf and a static load rating of 6750 lbf, it reliably handles significant combined loads.
- Pre-Lubricated & Ready for Use: The bearing comes pre-lubricated, ensuring immediate operational readiness and reducing initial setup complexity.
71920 ACE/P4A Bearing Typical Application Areas
The 71920 ACE/P4A is ideally suited for high-performance applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Instruments: Measuring devices and high-accuracy rotary tables.
- High-Frequency Motors and Spindles: Where low vibration and high rotational accuracy are paramount.
- Aerospace and Defense Systems: Actuators and control surface mechanisms.
