71908 ACD/DFCVQ253
71900 Series Super Precision Angular Contact Ball Bearings
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71908 ACD/DFCVQ253 Bearing Product Overview & Core Advantages
The 71908 ACD/DFCVQ253 is a precision angular contact ball bearing supplied as a matched duplex pair in a Face-to-Face (DF) arrangement. Engineered for high-performance applications, this bearing is characterized by its ability to handle combined loads—significant radial and bidirectional axial loads simultaneously. Manufactured to a P4A tolerance class and featuring a moderate preload (Class C), it delivers exceptional running accuracy, high system rigidity, and reliable operation in demanding conditions. Its compact design and optimized internal geometry make it an ideal choice for high-speed spindles and precision machinery.
Model Code Breakdown
| 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 | Duplex bearing (two bearings supplied as a set). |
| DF | Matched arrangement: Face-to-Face. This configuration provides good moment load capacity and is less sensitive to misalignment. |
| CVQ253 | Specific internal design and preload classification. Indicates Moderate Preload (Class C) for optimal rigidity and running accuracy. |
71908 ACD/DFCVQ253 Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex face-to-face (DF) arrangement creates a highly rigid bearing system capable of supporting combined radial and axial loads from both directions. The 25° contact angle is optimized for substantial axial load carrying capacity.
- Precision & High-Speed Performance: Manufactured to P4A tolerance class for superior dimensional and running accuracy. The lightweight phenolic cage and precision-ground chrome steel components contribute to smooth operation and a high limiting speed of 56,000 rpm.
- Optimized Internal Geometry: Features 21 balls with a diameter of 6.35 mm, a configuration designed to maximize dynamic load rating (4275 lbf) and static load rating (3600 lbf) within a compact cross-section.
- Pre-lubricated & Ready-to-Install: The bearing is supplied lubricated and is an open type, allowing for specific application-based lubrication system integration.
71908 ACD/DFCVQ253 Bearing Typical Application Areas
This high-precision, high-speed bearing is ideally suited for applications requiring exceptional rigidity and accuracy, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling, engraving, and high-frequency motor spindles.
- Industrial Pumps and Compressors
- Robotic Arm Joints and Precision Gearboxes
