S71908 ACB/HCP4A
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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S71908 ACB/HCP4A Bearing Product Overview & Core Advantages
The S71908 ACB/HCP4A is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. As a single-row bearing, it is optimized to accommodate combined loads (radial and axial loads in one direction) with high reliability. Its defining features include a 25° contact angle for superior axial load capacity, a P4 (ABEC-7) tolerance class for extreme precision, and a ceramic ball and phenolic cage combination that enables high-speed operation and reduced weight. This bearing is preloaded and pre-lubricated, making it an ideal, ready-to-install solution for high-rigidity and high-speed spindle systems.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| S71908 | Denotes the bearing series and size. 40mm bore, 62mm outside diameter, 12mm width. |
| ACB | Angular Contact Bearing with a 25° contact angle. |
| HCP4A | Indicates a P4 (ABEC-7) tolerance class and the presence of a preload for enhanced rigidity and rotational accuracy. |
S71908 ACB/HCP4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The P4 tolerance class and applied preload ensure minimal runout and superior rotational accuracy, which is critical for machine tool spindles.
- High-Speed Capability: The combination of ceramic balls (lower density, reduced centrifugal force) and a lightweight phenolic cage allows for a high limiting speed of 32,000 rpm, reducing friction and heat generation.
- Superior Load Capacity: The 25° contact angle is engineered to handle significant axial loads in one direction while simultaneously supporting radial loads.
- Optimal Material Selection: Chrome steel rings provide durability, while the ceramic ball and phenolic cage construction contributes to a longer service life and consistent performance under high-speed conditions.
S71908 ACB/HCP4A Bearing Typical Application Areas
- Machine Tool Spindles (CNC machining centers, grinding spindles)
- High-Speed Motors and Precision Drives
- Dental and Medical Handpieces
- Aerospace Instrumentation and Gyroscopes
