71908 ACD/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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71908 ACD/HCP4ADGA Bearing Product Overview & Core Advantages
The 71908 ACD/HCP4ADGA is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. This universal matchable (SU) bearing features a 25° contact angle and P4A tolerance class for superior running accuracy. Its ceramic ball construction enables outstanding high-speed capabilities while maintaining dimensional stability across a wide temperature range (-30°C to 110°C). The bearing's extra light preload (Class A) ensures minimal friction and optimal performance in precision spindle applications.
71908 ACD/HCP4ADGA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Performance Benefit |
|---|---|---|
| 71908 | Basic bearing series with 40mm bore diameter | Standardized dimensions for easy integration |
| ACD | Angular Contact Design with 25° contact angle | Optimized for combined radial and axial loads |
| HC | Hybrid Ceramic balls | Enhanced speed capability and reduced friction |
| P4A | High precision tolerance class | Superior running accuracy and minimal vibration |
| SU | Universal Matchable arrangement | Flexible mounting configurations in pairs |
71908 ACD/HCP4ADGA Bearing Structural Features & Performance Benefits
Hybrid Ceramic Construction: The combination of chrome steel rings and ceramic balls provides exceptional high-speed performance with a limiting speed of 56,000 rpm. This configuration significantly reduces centrifugal forces and extends service life.
Precision Engineering: Manufactured to P4A tolerance class with bore and outside diameter tolerances of -0.004mm to 0, ensuring precise shaft and housing fits. The phenolic cage offers excellent dimensional stability and reduced weight for high acceleration applications.
Load Capacity Optimization: With a 25° contact angle and 21 ceramic balls of 6.35mm diameter, this bearing delivers outstanding combined load capacity (4,275 lbf dynamic / 3,600 lbf static) while maintaining high rigidity.
Thermal Performance: The open design with specialized lubrication accommodates operating temperatures from -30°C to 110°C, making it suitable for applications with significant thermal variations.
71908 ACD/HCP4ADGA Bearing Typical Application Areas
- Machine Tool Spindles: High-speed machining centers and precision grinding spindles
- Medical Equipment: Dental handpieces, surgical tools, and diagnostic imaging systems
- Aerospace Systems Guidance systems, flight control mechanisms, and auxiliary power units
- Semiconductor Manufacturing: Wafer handling robots, precision positioning stages
- High-Speed Motors: Spindle motors, turbochargers, and specialized drive systems
