S71908 CB/HCP4ADBC
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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S71908 CB/HCP4ADBC Bearing Product Overview & Core Advantages
The S71908 CB/HCP4ADBC is a precision duplex angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This metric bearing features a back-to-back (DB) matched arrangement and a P4A super-precision tolerance class, making it ideal for high-speed spindles and other precision machinery. Its core advantages include the ability to handle combined radial and axial loads simultaneously, outstanding operational stability due to its preloaded duplex configuration, and excellent high-speed performance enabled by its ceramic balls and phenolic cage.
Model Code Breakdown
- S7: High-precision bearing series
- 1908: Standard size designation (40mm bore, 62mm OD, 24mm width)
- CB: Moderate preload (Class C) and specific internal clearance
- HC: Hybrid Ceramic construction (steel rings with ceramic balls)
- P4A: Super-precision tolerance class, tighter than ABEC 7
- DB: Duplex arrangement, Back-to-Back mounting
- C: Phenolic (resin) cage material
S71908 CB/HCP4ADBC Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex back-to-back (DB) design creates a rigid bearing system that can withstand significant combined loads and moment loads, providing exceptional support for spindles and shafts.
Superior High-Speed Performance: The combination of ceramic (Si3N4) balls and a lightweight phenolic cage reduces centrifugal forces, lowers operating temperature, and allows for a very high limiting speed of 41,000 rpm.
Enhanced Precision & Longevity: The P4A tolerance class ensures minimal runout and vibration for superior machining quality. Hybrid construction offers increased stiffness, reduced heat generation, and extended service life compared to all-steel bearings.
Pre-Optimized Configuration: The bearings are factory-matched and preloaded, simplifying installation and ensuring immediate, optimal performance without the need for complex on-site adjustment.
S71908 CB/HCP4ADBC Bearing Typical Application Areas
This high-precision, high-speed bearing is engineered for advanced applications including:
- Machine Tool Spindles: High-speed CNC milling, grinding, and turning centers
- Precision Spindles: PCB drilling, engraving, and semiconductor manufacturing equipment
- High-Frequency Motors: Spindles for routers and high-speed electric motors
- Medical & Laboratory Equipment: Centrifuges and other high-speed rotational devices
