S71920 CB/P4A
Sealed Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
S71920 CB/P4A
Basic Information
System of measurement
Metric
Weight
0.88 kg
Tolerance class
P4 (ABEC-7)
Seal type
Sealed
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
7.938 mm
Ball quantity
37
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
4860 lbf
Radial static load rating
5040 lbf
Limiting speed
12 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:
$ 1571.74
/ each
In Stock
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S71920 CB/P4A Bearing Product Overview & Core Advantages
The S71920 CB/P4A is a single-row angular contact ball bearing engineered for applications demanding high precision and exceptional rotational accuracy. Operating under the stringent P4 (ABEC-7) tolerance class, this bearing is preloaded and designed to accommodate high combined loads, primarily thrust loads in one direction, while also supporting significant radial loads. Its compact cross-section, phenolic resin cage, and pre-lubrication make it an ideal solution for high-speed spindles and other precision machinery where rigidity and minimal heat generation are critical.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| S | Designates a bearing with a super-precision tolerance class. |
| 71920 | The basic bearing series and size designation (100mm bore, 140mm OD, 20mm width). |
| C | Indicates a 15° contact angle, optimized for high-speed applications and thrust load capacity. |
| B | Signifies a 40° pressure angle (a common design for this series). |
| /P4A | Denotes the P4 tolerance class (equivalent to ABEC-7) and specific internal running accuracy. |
S71920 CB/P4A Bearing Structural Features & Performance Benefits
- High Precision & Rigidity: Manufactured to P4 tolerance class with a 15° contact angle and preload, this bearing delivers exceptional running accuracy and system stiffness, minimizing deflection under load.
- Optimized for High-Speed Operation: The lightweight phenolic resin cage ensures excellent dimensional stability and low friction at the limiting speed of 12,000 rpm, reducing centrifugal forces and heat buildup.
- Superior Load Capacity: The single-row design with a 15° contact angle is engineered to efficiently handle combined radial and axial loads, with a dynamic load rating of 4860 lbf and a static load rating of 5040 lbf.
- Sealed & Lubricated for Long Life: As a sealed and pre-lubricated unit, the bearing is protected from contamination and is ready for immediate installation, offering reliable performance within a temperature range of -30°C to 110°C.
S71920 CB/P4A Bearing Typical Application Areas
This precision angular contact ball bearing is ideally suited for high-performance applications, including:
- Machine Tool Spindles (High-speed milling, grinding)
- Precision Grinding Spindles
- High-Frequency Motors
- Medical and Dental Equipment Spindles
- Aerospace Instrumentation
