71908 FEGA/HCP4AL
Hybrid Ceramic Super Precision Bearings
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71908 FEGA/HCP4AL Bearing Product Overview & Core Advantages
The 71908 FEGA/HCP4AL is a high-precision angular contact ball bearing designed for applications demanding exceptional accuracy and performance. This single bearing features an Extra Light preload (Class A) and is manufactured to P4A tolerance class, ensuring minimal runout and superior rotational precision. Its optimized 18° contact angle provides excellent performance for combined loads, effectively handling radial and axial loads simultaneously. The use of ceramic balls and a phenolic cage contributes to its high-speed capability, low friction, and extended service life, making it ideal for high-reliability, high-speed machinery.
71908 FEGA/HCP4AL Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71908 | Basic bearing designation, indicating a metric, high-precision angular contact bearing with a 40mm bore. |
| FE | Designates a Universal Matchable (SU) bearing, allowing for precise axial play adjustment when mounted with a second, identical bearing. |
| GA | Indicates the preload level: Extra Light (Class A). |
| HC | Refers to the hybrid ceramic construction, featuring ceramic balls for reduced weight, lower friction, and higher speed capability. |
| P4A | Specifies the tolerance class, denoting very high precision for both bore and outside diameter. |
| Open | The bearing is supplied without seals or shields, optimized for high-speed applications where minimal friction is critical. |
71908 FEGA/HCP4AL Bearing Structural Features & Performance Benefits
- High-Speed Performance & Low Friction: The combination of ceramic balls and a lightweight phenolic cage significantly reduces centrifugal forces and friction, enabling a high limiting speed of 41,000 rpm. This hybrid construction also offers superior resistance to thermal expansion and electrical arcing.
- Exceptional Rigidity & Precision: Manufactured to P4A tolerance class with an Extra Light preload, this bearing provides high system rigidity and precise shaft positioning, minimizing deflection under load and ensuring smooth, accurate operation.
- Optimized Load Capacity: The 18° contact angle is engineered to handle combined radial and axial loads effectively. With a dynamic load rating of 2194 lbf and a static load rating of 1350 lbf, it offers reliable performance in demanding applications.
- Universal Matching Capability: As a Universal Matchable (SU) bearing, it can be paired with an identical bearing to create a precisely preloaded set, simplifying installation and optimizing performance in duplex arrangements.
71908 FEGA/HCP4AL Bearing Typical Application Areas
The 71908 FEGA/HCP4AL is engineered for high-performance applications where speed, precision, and reliability are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy positioning systems.
- Aerospace & Defense: Gyroscopes, navigation systems, and auxiliary power units (APUs).
- Medical Equipment: High-speed dental handpieces and surgical drill spindles.
- Semiconductor Manufacturing: Wafer handling robots and precision stages.
