71908 CE/P4ADGA
71900 Series Super Precision Angular Contact Ball Bearings
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71908 CE/P4ADGA Bearing Product Overview & Core Advantages
The 71908 CE/P4ADGA is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. Operating under the stringent P4A tolerance class, this bearing is engineered to handle combined loads efficiently, supporting significant radial loads alongside axial loads in one direction. Its universal matchable (SU) design allows two bearings to be paired in a back-to-back or face-to-face arrangement, optimizing system rigidity and moment load capacity. The combination of a phenolic cage and high-grade chrome steel construction contributes to its high-speed performance and long service life, making it an ideal choice for high-precision, high-reliability machinery.
71908 CE/P4ADGA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71908 | Basic bearing series, indicating a metric, angular contact design with a 40mm bore. |
| C | Designates a 15° contact angle, optimized for high-speed operation and axial load capacity. |
| E | Indicates an optimized internal design for enhanced performance. |
| P4A | Specifies the high-precision tolerance class, exceeding standard ABEC 7/ISO P4 levels for runout and dimensional accuracy. |
| DG | Universal matchable (SU) designation, meaning two bearings are selectively matched to a specific preload when paired. |
| A | Indicates an extra light preload for minimal friction and optimal high-speed performance. |
71908 CE/P4ADGA Bearing Structural Features & Performance Benefits
High Rigidity and Precision: Manufactured to P4A tolerance class with extremely tight dimensional tolerances, this bearing provides superior running accuracy and system stability. The universal matchable (SU) pairing capability allows for the creation of a highly rigid bearing set that can withstand complex moment loads.
Optimized Load Capacity: The 15° contact angle is engineered to support high combined loads, offering a robust solution for applications with significant radial and one-direction axial forces.
Superior High-Speed Performance: The lightweight phenolic resin cage ensures excellent dimensional stability and low centrifugal forces at high rotational speeds, contributing to a limiting speed of 56,000 rpm. The open design and factory-applied lubrication facilitate efficient heat dissipation.
Durability and Reliability: Constructed from high-carbon chrome steel for both rings and balls, the bearing offers high fatigue life and wear resistance, suitable for a wide operating temperature range.
71908 CE/P4ADGA Bearing Typical Application Areas
The 71908 CE/P4ADGA is ideally suited for high-precision, high-speed machinery where accuracy and rigidity are paramount. Key applications include:
- Machine Tool Spindles: For CNC machining centers, grinding spindles, and high-speed milling heads.
- Precision Instrumentation: In measuring devices, optical scanners, and laboratory equipment.
- High-Frequency Motors and Spindles: Used in PCB drilling spindles and dental handpieces.
- Aerospace and Defense Systems: For gyroscopes, radar equipment, and other critical navigation components.
