S71928 CD/P4A
Sealed Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
S71928 CD/P4A
Basic Information
System of measurement
Metric
Weight
1.69 kg
Tolerance class
P4 (ABEC-7)
Seal type
Sealed
For load direction
Angular Contact
Main Dimensions
Bore diameter
140 mm
Bore diameter tolerance
-0.01mm to 0
Outside diameter
190 mm
Outside diameter tolerance
-0.011mm to 0
Width
24 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
15.875 mm
Ball quantity
29
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
21510 lbf
Radial static load rating
26100 lbf
Limiting speed
6.7 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:
$ 2418.49
/ each
In Stock
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S71928 CD/P4A Bearing Product Overview & Core Advantages
The S71928 CD/P4A is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and reliability. Engineered to a P4 (ABEC-7) tolerance class, this bearing is optimized to simultaneously handle combined radial and axial loads. Its compact design, featuring a 140 mm bore and 24 mm width, offers a high load capacity within a minimal cross-section. The combination of a phenolic cage and preloaded design ensures smooth, high-speed operation up to 6,700 rpm, making it an ideal solution for high-rigidity, precision spindle systems.
S71928 CD/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S | Designates a super-precision bearing series. |
| 7 | Indicates an angular contact ball bearing design. |
| 1928 | Specifies the bearing dimensions: 140mm bore, 190mm OD, 24mm width. |
| CD | Signifies a 15° contact angle and a specific internal design optimized for high rigidity and preload. |
| P4A | Denotes a P4 (ABEC-7) tolerance class with enhanced running accuracy requirements. |
S71928 CD/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The angular contact design with a 15° contact angle and preload provides superior axial and radial stiffness, minimizing deflection under load for exceptional positional accuracy.
- Superior Load Capacity: Engineered to handle significant combined loads, with a dynamic load rating of 21,510 lbf and a static load rating of 26,100 lbf.
- Optimized High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, while the precision-ground chrome steel balls and raceways enable smooth operation at limiting speeds of 6,700 rpm.
- Sealed and Lubricated for Longevity: As a sealed and pre-lubricated unit, the bearing is protected from contamination and is ready for immediate use, offering a long service life within its specified temperature range.
S71928 CD/P4A Bearing Typical Application Areas
This precision bearing is ideally suited for high-performance machinery where accuracy and speed are critical. Key applications include:
- Machine Tool Spindles for CNC milling and grinding machines
- High-frequency Precision Spindles
- High-Speed Motors and Robotic Drives
- Medical and dental equipment spindles
- Advanced Aerospace instrumentation and control systems
