S71905 CE/P4A
Sealed Super Precision Angular Contact Ball Bearings
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S71905 CE/P4A Bearing Product Overview & Core Advantages
The S71905 CE/P4A is a super-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and high-speed performance. As a single-row bearing, it is optimized to support combined loads, primarily handling high radial loads and axial loads in one direction. Its P4 (ABEC-7) tolerance class ensures minimal runout and vibration, making it ideal for high-precision spindles. The bearing comes with a phenolic resin cage and is pre-lubricated for immediate use, offering outstanding reliability and a long service life in demanding operational environments.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| S71905 | Denotes the bearing series and size. Bore diameter: 25 mm, Outside diameter: 42 mm, Width: 9 mm. |
| C | Specifies a 15° contact angle, optimized for high-speed operation and moderate axial load capacity. |
| E | Indicates the use of a high-grade, phenolic resin cage, which is lightweight and suitable for high-speed applications. |
| P4A | Defines the tolerance class P4 (ABEC-7) and specific internal clearance/geometry for high-precision applications. |
S71905 CE/P4A Bearing Structural Features & Performance Benefits
High-Speed Capability: The combination of the 15° contact angle and the lightweight phenolic cage significantly reduces centrifugal forces, enabling a high limiting speed of 49,000 rpm. This makes it a true high-speed bearing.
High Rigidity and Precision: Manufactured to P4 tolerance with a bore diameter tolerance of -0.005mm to 0, this bearing provides exceptional running accuracy and system stiffness, which is critical for machine tool spindles and other precision equipment.
Optimized Load Capacity: The single-row design with a 15° contact angle is engineered to support significant radial loads and one-directional axial loads simultaneously, as reflected in its dynamic load rating of 1186 lbf.
Ready-to-Use Lubrication: The bearing is pre-lubricated, ensuring immediate operational readiness and reliable performance from the first rotation, simplifying installation and maintenance.
S71905 CE/P4A Bearing Typical Application Areas
The S71905 CE/P4A is ideally suited for high-performance applications where speed, precision, and reliability are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Instrumentation: High-speed rotors in measuring and testing equipment.
- High-Frequency Motors and Spindles: Applications requiring minimal vibration and high rotational accuracy.
- Medical and Dental Equipment: High-speed handpieces and drills.
