71908 ACD/P4ADGC
71900 Series Super Precision Angular Contact Ball Bearings
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71908 ACD/P4ADGC Bearing Product Overview & Core Advantages
The 71908 ACD/P4ADGC is a precision angular contact ball bearing designed for applications requiring exceptional rotational accuracy and rigidity. As a universal matchable (SU) bearing supplied in a pre-set pair, it delivers superior performance in handling combined radial and axial loads. Manufactured to P4A tolerance class with a 25° contact angle and moderate preload (Class C), this bearing is engineered for high-speed operation up to 41,000 rpm, making it an ideal solution for high-precision, high-rigidity spindles and other demanding machinery.
71908 ACD/P4ADGC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71908 | Basic bearing series designation |
| AC | Angular Contact design with 25° contact angle |
| D | High dimensional stability and precision |
| P4A | High precision tolerance class (exceeding ABEC 7) |
| DGC | Universal Matchable arrangement (SU designation) supplied as a pair |
71908 ACD/P4ADGC Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The double bearing arrangement with moderate preload provides exceptional system stiffness, enabling precise positioning under combined radial and axial loads. With a dynamic load rating of 4,275 lbf and static load rating of 3,600 lbf, it delivers reliable performance in demanding applications.
High-Speed Performance: Featuring a phenolic resin cage and optimized internal geometry, this bearing achieves a remarkable limiting speed of 41,000 rpm. The lightweight cage reduces centrifugal forces while maintaining dimensional stability at elevated temperatures.
Precision Engineering: Manufactured to P4A tolerance class with tight dimensional controls (bore and OD tolerance: -0.004mm to 0), this bearing ensures minimal runout and vibration for superior rotational accuracy.
Universal Matching Capability: As Universal Matchable (SU) bearings supplied in a matched pair of two, they can be mounted in various configurations (DB, DF, DT) without additional selection, simplifying installation and ensuring optimal preload.
71908 ACD/P4ADGC Bearing Typical Application Areas
- Machine Tool Spindles - High-speed milling, grinding, and turning centers
- Precision Instrumentation - Measuring equipment and optical devices
- High-Speed Motors - Spindle motors and servo drives
- Medical Equipment - Dental handpieces and surgical tools
- Aerospace Components - Gyroscopes and navigation systems
- Robotics - Precision joints and rotary actuators
