S71908 ACB/HCP4ADBA
Hybrid Ceramic Super Precision Bearings
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S71908 ACB/HCP4ADBA Bearing Product Overview & Core Advantages
The S71908 ACB/HCP4ADBA is a super-precision angular contact ball bearing designed for the most demanding applications. This matched duplex pair, arranged in a Back-to-Back (DB) configuration, delivers exceptional rotational accuracy and system rigidity. Its construction with a Phenolic cage and ceramic balls enables superior high-speed performance and reliable operation under combined radial and axial loads. Pre-lubricated with grease and sealed for life, it offers a maintenance-free solution for high-precision machinery.
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. |
| ACB | Contact Angle of 25°. |
| HCP4A | High-Precision P4A tolerance class for extreme running accuracy. |
| DBA | Duplex Back-to-Back arrangement with Extra Light (A) preload. |
S71908 ACB/HCP4ADBA Bearing Structural Features & Performance Benefits
- Superior Rigidity & Load Capacity: The duplex Back-to-Back (DB) arrangement creates a rigid bearing system that can withstand combined loads (radial and axial loads acting simultaneously) and moment loads effectively. This configuration provides excellent operational stability.
- High-Speed Capability: The combination of a lightweight Phenolic resin cage and low-density ceramic (Si3N4) balls significantly reduces centrifugal forces, allowing for a very high limiting speed of 41,000 rpm. This makes it ideal for high-speed spindles.
- Extended Service Life & Reliability: Ceramic balls offer superior wear resistance, lower thermal expansion, and electrical insulation properties compared to steel. The bearings are sealed and pre-lubricated, ensuring long-term, maintenance-free operation within the specified temperature range.
- Extreme Precision: Manufactured to P4A tolerance class, this bearing guarantees minimal runout and vibration, which is critical for achieving the highest levels of machining and positioning accuracy.
S71908 ACB/HCP4ADBA Bearing Typical Application Areas
This high-precision bearing is engineered for advanced machinery where speed, accuracy, and rigidity are paramount. Key applications include:
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and CNC milling machines.
- Precision Rotary Systems: Industrial robots, rotary tables, and indexing heads.
- High-Frequency Motors & Spindles: PCB drilling spindles and dental handpieces.
- Aerospace & Defense Systems: Gyroscopes, radar equipment, and navigation systems.
