S71921 CD/P4A
Sealed Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
S71921 CD/P4A
Basic Information
System of measurement
Metric
Weight
0.85 kg
Tolerance class
P4 (ABEC-7)
Seal type
Sealed
For load direction
Angular Contact
Main Dimensions
Bore diameter
105 mm
Bore diameter tolerance
-0.008mm to 0
Outside diameter
145 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
27
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
13905 lbf
Radial static load rating
15638 lbf
Limiting speed
8.5 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:
$ 1702.1
/ each
In Stock
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S71921 CD/P4A Bearing Product Overview & Core Advantages
The S71921 CD/P4A is a precision angular contact ball bearing engineered for high-performance applications requiring exceptional rotational accuracy and rigidity. This single-row bearing features a 15° contact angle and is supplied with a preload, making it ideal for setups demanding high system stiffness and minimal axial/radial runout. Its P4 (ABEC-7) tolerance class ensures superior dimensional precision, while its sealed design and factory lubrication provide reliable, long-term operation in demanding environments.
S71921 CD/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S71921 | Basic bearing designation, indicating a high-precision angular contact ball bearing series. |
| CD | Specifies a duplex arrangement with a specific preload level (not explicitly defined in provided data, but standard for matched pairs). |
| P4A | Denotes the tolerance class P4 (ABEC-7) with specific running accuracy requirements. |
S71921 CD/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The 15° contact angle and applied preload significantly increase system stiffness, critical for applications like machine tool spindles to resist deflection under load.
- Optimized Load Capacity: Designed to support combined radial and axial loads simultaneously. The radial dynamic load rating of 13,905 lbf and static load rating of 15,638 lbf ensure reliable performance under demanding conditions.
- High-Speed Capability: The phenolic resin cage is lightweight and robust, contributing to lower centrifugal forces and stable operation at the limiting speed of 8,500 rpm.
- Sealed and Lubricated for Life: The sealed design effectively excludes contaminants. Combined with factory-applied lubrication suitable for a temperature range of -30°C to 110°C, it offers a maintenance-free, long-service-life solution.
S71921 CD/P4A Bearing Typical Application Areas
This bearing is ideally suited for high-precision, high-speed machinery, including:
- Machine Tool Spindles (milling, grinding, and lathe spindles)
- Precision Gearboxes
- High-Frequency Motors and Spindles
- Medical and Dental Equipment
- Aerospace Instrumentation
