71908 ACBGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Main Dimensions
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71908 ACBGA/HCP4A Bearing Product Overview & Core Advantages
The 71908 ACBGA/HCP4A is a single-row angular contact ball bearing designed for applications demanding ultra-high precision and exceptional performance. Engineered with a 25° contact angle and manufactured to P4A tolerance class, this bearing delivers superior running accuracy and rotational stability. Its ceramic ball construction and phenolic cage enable outstanding high-speed capabilities while maintaining dimensional stability across a wide temperature range. The bearing comes pre-lubricated and is universally matchable, allowing for precise axial preload adjustment when mounted in pairs.
71908 ACBGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Performance Benefit |
|---|---|---|
| 71908 | Basic bearing series with 40mm bore diameter | Standardized dimension compatibility |
| AC | Angular Contact design | Optimized for combined radial and axial loads |
| B | 40° contact angle (standard for this series) | Enhanced axial load capacity |
| GA | Universal matching bearing | Flexible mounting arrangements in pairs |
| HC | Hybrid Ceramic balls | Reduced weight, higher speed capability, electrical insulation |
| P4A | Super precision tolerance class | Exceptional running accuracy and minimal vibration |
71908 ACBGA/HCP4A Bearing Structural Features & Performance Benefits
Hybrid Ceramic Construction: The combination of chrome steel rings and silicon nitride ceramic balls provides significant advantages including reduced centrifugal forces, lower operating temperatures, and extended service life at high speeds up to 56,000 rpm.
Precision Engineering: Manufactured to P4A tolerance class with tight dimensional controls on bore diameter (40mm), outside diameter (62mm), and width (12mm), ensuring consistent performance in precision applications.
Optimized Cage Design: The phenolic resin cage offers excellent strength-to-weight ratio, reduced friction, and compatibility with various lubricants across the operating temperature range of -30°C to 110°C.
Superior Load Capacity: With a dynamic load rating of 1141 lbf and static load rating of 878 lbf, this bearing handles significant combined loads while maintaining precision alignment.
Universal Matching Capability: Designed as universally matchable bearings, they can be arranged in pairs to accommodate varying preload requirements and complex load conditions.
71908 ACBGA/HCP4A Bearing Typical Application Areas
- High-speed machine tool spindles requiring precision and thermal stability
- Precision grinding applications where running accuracy is critical
- Medical and dental equipment demanding quiet operation and reliability
- Aerospace components requiring lightweight, high-performance bearings
- Robotics and automation systems needing precise motion control
- High-frequency motor applications benefiting from ceramic ball advantages
- Semiconductor manufacturing equipment requiring contamination-free operation
