71908 CD/P4ADBC
71900 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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Materials
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71908 CD/P4ADBC Bearing Product Overview & Core Advantages
The 71908 CD/P4ADBC is a precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This duplex back-to-back (DB) arrangement provides superior stiffness and moment load capacity, making it ideal for high-precision spindles and machinery. The bearing is pre-lubricated and features a moderate preload (Class C), ensuring optimal performance and stability from installation. Its P4A tolerance class guarantees extremely tight dimensional and running accuracy for superior operational performance.
71908 CD/P4ADBC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71908 | Basic bearing designation indicating size series and bore diameter (40mm) |
| C | 15° contact angle |
| D | Duplex arrangement |
| P4A | High precision tolerance class with enhanced running accuracy requirements |
| DB | Back-to-back mounting arrangement for high rigidity and moment load capacity |
| C | Moderate preload classification |
71908 CD/P4ADBC Bearing Structural Features & Performance Benefits
High Rigidity & Moment Load Capacity: The duplex back-to-back configuration creates a wide effective spread between load centers, significantly increasing system stiffness and resistance to moment loads. This makes the bearing exceptionally stable under complex loading conditions.
Precision Performance: Manufactured to P4A tolerance class, this bearing ensures minimal runout and vibration, critical for high-speed and high-precision applications. The 15° contact angle provides optimal balance between radial and axial load capacity.
High-Speed Capability: The phenolic cage offers excellent strength-to-weight ratio and smooth operation at high speeds, contributing to the bearing's limiting speed of 56,000 rpm. The open design facilitates efficient lubrication and heat dissipation.
Premium Material Construction: Manufactured from chrome steel for both rings and balls, the bearing delivers high fatigue life and durability. The material combination ensures reliable performance across the specified temperature range of -30°C to 110°C.
71908 CD/P4ADBC Bearing Typical Application Areas
- Machine tool spindles for milling, grinding, and turning centers
- High-precision machining centers requiring extreme accuracy
- Industrial spindles for woodworking, metal cutting, and PCB drilling
- Precision instruments and measuring equipment
- High-speed robotic systems and automation equipment
- Medical device manufacturing equipment
