71908 ACD/P4ADGA
71900 Series Super Precision Angular Contact Ball Bearings
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71908 ACD/P4ADGA Bearing Product Overview & Core Advantages
The 71908 ACD/P4ADGA is a precision angular contact ball bearing designed for applications demanding exceptional accuracy and high-speed performance. As a universally matchable (SU) bearing supplied in a pre-loaded duplex set, it is engineered to handle combined radial and axial loads simultaneously. Its P4A tolerance class ensures superior running accuracy, making it ideal for high-rigidity spindles and other precision machinery where minimal runout and stable rotational characteristics are critical.
71908 ACD/P4ADGA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71908 | Basic bearing series and size designation (40mm bore, 62mm OD, 24mm width). |
| AC | Angular Contact design with a 25° contact angle. |
| D | The bearing is part of a duplex set (two bearings). |
| P4A | Indicates a high-precision tolerance class, superior to ABEC-7. |
| DG | Universal Matchable (SU) arrangement. Two bearings can be paired in any combination (DB, DF, DT) to achieve the required stiffness and load capacity. |
| A | Specifies an Extra Light preload on the bearing set. |
71908 ACD/P4ADGA Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex pair configuration creates a highly rigid system capable of withstanding significant combined loads. The 25° contact angle is optimized for carrying substantial axial loads in one direction, while also supporting radial loads.
High-Speed Performance: The lightweight phenolic resin cage minimizes centrifugal forces, reduces friction, and contributes to the high limiting speed of 56,000 rpm. This makes it an excellent high-speed bearing for demanding applications.
Precision & Accuracy: Manufactured to P4A tolerance class with tight dimensional control on all bearing dimensions (bore, OD, width), this bearing ensures minimal vibration and superior running accuracy for precision equipment.
Universal Matchability (SU): This feature provides exceptional flexibility in mounting. The two bearings in the set can be arranged in back-to-back (DB), face-to-face (DF), or tandem (DT) configurations to best suit the application's load and rigidity requirements.
71908 ACD/P4ADGA Bearing Typical Application Areas
The 71908 ACD/P4ADGA is ideally suited for high-performance applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling and routing machines.
- High-Frequency Motors: Spindles for CNC machinery.
- Robotics: High-accuracy joints and arm assemblies.
