71908 ACE/HCP4ADGA
Hybrid Ceramic Super Precision Bearings
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Main Dimensions
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71908 ACE/HCP4ADGA Bearing Product Overview & Core Advantages
The 71908 ACE/HCP4ADGA is a super-precision angular contact ball bearing engineered for the most demanding high-speed and high-rigidity applications. This metric series bearing features a 25° contact angle and an Extra Light preload (Class A), delivering exceptional rotational accuracy and minimal runout. Its universal matchable (SU) design allows for flexible mounting in pairs to support combined loads, including significant bidirectional axial thrust. Manufactured to the stringent P4A tolerance class, it is the ideal solution for machine tool spindles and other precision equipment requiring ultimate performance and reliability.
71908 ACE/HCP4ADGA Bearing Model Code Explained, Specifications & Naming Convention
| 71908 | Basic bearing series and size code (40mm bore, 62mm OD, 24mm width). |
| ACE | Signifies a 25° contact angle and Extra Light preload (Class A). |
| HC | Indicates a Phenolic (Hybrid Composite) cage material, ideal for high-speed operation. |
| P4A | Denotes the super-precision tolerance class, exceeding ABEC 7 standards for running accuracy. |
| DGA | Specifies that the bearing is universally matchable (SU) and comes pre-lubricated. |
71908 ACE/HCP4ADGA Bearing Structural Features & Performance Benefits
Hybrid Ceramic Design: The combination of chrome steel rings and ceramic balls (Si3N4) significantly reduces centrifugal forces, lowers operating temperature, and extends service life, especially at very high speeds (limiting speed of 41,000 rpm).
High Rigidity & Load Capacity: The angular contact design and preload provide superior axial and radial stiffness, enabling the bearing to handle combined loads effectively. The dynamic load rating of 3398 lbf ensures reliable performance under demanding conditions.
Optimized High-Speed Performance: The lightweight phenolic cage ensures excellent dimensional stability and low friction at high rotational velocities, contributing to the bearing's exceptional limiting speed.
Precision & Thermal Stability: Manufactured to P4A tolerances, this bearing guarantees minimal vibration and high running accuracy. The phenolic cage and ceramic balls also offer superior performance across the specified temperature range (-30°C to 110°C).
71908 ACE/HCP4ADGA Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Instrumentation: High-resolution measuring and testing equipment.
- High-Frequency Motors & Spindles: Applications requiring extreme rotational accuracy and minimal heat generation.
- Aerospace & Defense Systems: Gyroscopes, navigation systems, and other critical components.
