71908 ACB/HCP4ADGA
Hybrid Ceramic Super Precision Bearings
Image may differ from product. See technical specification for details.
Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
71908 ACB/HCP4ADGA Bearing Product Overview & Core Advantages
The 71908 ACB/HCP4ADGA is a super-precision angular contact ball bearing designed for the most demanding high-speed and high-rigidity applications. Its universal matchable (SU) design allows for flexible mounting in various preload configurations, making it ideal for spindle assemblies. A key advantage is its use of ceramic balls and a phenolic cage, which significantly reduce centrifugal forces, lower operating temperatures, and enable exceptional limiting speeds. This bearing is manufactured to an ultra-precise P4A tolerance class, ensuring minimal runout and superior rotational accuracy for critical machinery.
71908 ACB/HCP4ADGA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71908 | Basic bearing series and size designation (40mm bore, 62mm OD, 24mm width). |
| ACB | Angular Contact Bearing with a 25° contact angle, optimized for combined loads. |
| HC | Hybrid Ceramic: Signifies the use of ceramic balls for high-speed performance. |
| P4A | The tolerance class, indicating ultra-high precision for spindle applications. |
| DGA | Universal Matchable (SU) arrangement in a Duplex "Back-to-Back" configuration. |
71908 ACB/HCP4ADGA Bearing Structural Features & Performance Benefits
Hybrid Ceramic Construction: The combination of steel rings and silicon nitride (Si3N4) ceramic balls reduces weight, minimizes friction, and provides electrical insulation. This is critical for achieving a limiting speed of 56,000 rpm and extended service life.
Phenolic Resin Cage: The lightweight and robust phenolic cage offers excellent dimensional stability and guidance at high speeds, contributing to smooth and quiet operation.
High Rigidity & Load Capacity: The 25° contact angle and universal matchable (SU) design provide high rigidity, enabling the bearing to support significant combined radial and axial loads.
Precision & Reliability: Manufactured to P4A tolerances with strict dimensional control, this bearing guarantees high running accuracy and consistent performance in precision spindles.
71908 ACB/HCP4ADGA Bearing Typical Application Areas
The 71908 ACB/HCP4ADGA is engineered for high-performance applications where speed, precision, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: High-accuracy robotic arms and joints.
- Aerospace & Defense: Gyroscopes, radar systems, and auxiliary power units.
- Medical Equipment: Dental handpieces and high-speed centrifuges.
- Semiconductor Manufacturing: Wafer handling robots and precision stages.
