S71908 CB/HCP4ADGA
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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Materials
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S71908 CB/HCP4ADGA Bearing Product Overview & Core Advantages
The S71908 CB/HCP4ADGA is a super-precision angular contact ball bearing designed for the most demanding applications. Engineered to the exacting P4A tolerance class, this metric bearing excels in high-speed and high-rigidity scenarios. Its fundamental design allows it to accommodate combined loads—simultaneously handling radial and axial forces. The use of a phenolic cage and ceramic balls significantly reduces weight and inertial forces, enabling superior performance at the limiting speed of 41,000 rpm. This bearing is universally matchable (SU), allowing for flexible mounting arrangements in preloaded sets to achieve optimal system stiffness and rotational accuracy.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| S7 | Series designation for high-precision angular contact ball bearings. |
| 1908 | Bore diameter: 40 mm, Outside diameter: 62 mm, Width: 24 mm. |
| CB | Specific internal design and clearance for universal matching (SU). |
| HC | Hybrid Ceramic: Signifies the use of ceramic balls. |
| P4A | Tolerance class, denoting extremely high running accuracy. |
| DGA | Sealed on both sides and pre-lubricated with grease. |
S71908 CB/HCP4ADGA Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The combination of chrome steel rings and silicon nitride (Si3N4) ceramic balls provides exceptional benefits. Ceramic balls are lighter, harder, and have a lower coefficient of thermal expansion than steel, leading to reduced centrifugal forces, less friction, and the ability to maintain preload and precision over a wider temperature range (-30°C to 110°C).
- Phenolic Resin Cage: The lightweight and robust phenolic cage offers excellent dimensional stability and low friction at high speeds, contributing directly to the bearing's high limiting speed.
- 15° Contact Angle & Universal Match (SU): The 15° contact angle is optimized for high-speed applications requiring high rigidity. The universally matchable (SU) design with an extra light preload (Class A) allows two bearings to be mounted in any combination (back-to-back, face-to-face, or tandem) to create a preloaded set that maximizes system stiffness and accuracy.
- Sealed and Pre-Lubricated: The integral seals (DGA) protect against contamination and retain the high-performance grease, resulting in a maintenance-free and long-service-life solution for clean, high-speed environments.
S71908 CB/HCP4ADGA Bearing Typical Application Areas
The S71908 CB/HCP4ADGA is ideally suited for high-performance machinery where precision, speed, and reliability are paramount. Key application areas include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling and routing spindles.
- High-Frequency Motors: Spindles for electric vehicles and industrial automation.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and auxiliary power units.
- Medical Equipment: High-speed dental handpieces and laboratory centrifuges.
