71908 CD/P4ADBB
71900 Series Super Precision Angular Contact Ball Bearings
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Main Dimensions
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71908 CD/P4ADBB Bearing Product Overview & Core Advantages
The 71908 CD/P4ADBB is a precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This duplex back-to-back (DB) matched set is preloaded to Light / Class B specifications, ensuring high system stiffness and minimal axial/radial runout. Its primary advantage lies in its ability to handle combined loads—significant radial loads alongside substantial axial loads in both directions—making it ideal for high-precision, high-speed machinery where positioning accuracy is critical.
71908 CD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71908 | Basic bearing series and size designation (40mm bore, 62mm OD, 24mm width). |
| C | Specific internal design and 15° contact angle optimized for high-speed operation and rigidity. |
| D | Indicates the bearing is part of a duplex pair. |
| P4A | Super-precision tolerance class with enhanced running accuracy for spindle applications. |
| DB | Back-to-Back arrangement of the matched pair, providing high moment rigidity and stable preload. |
| B | Specifies the Light preload level for optimal stiffness and thermal performance. |
71908 CD/P4ADBB Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex back-to-back configuration creates a rigid bearing system that effectively resists moment loads and tilting. This setup, combined with the 15° contact angle, provides superior support for combined radial and axial loads from both directions.
Precision & High-Speed Performance: Manufactured to P4A super-precision standards with tight dimensional tolerances (bore/OD tolerance: -0.004mm to 0), this bearing ensures minimal vibration and exceptional running accuracy. The lightweight phenolic cage and optimized internal geometry contribute to a high limiting speed of 56,000 rpm, making it suitable for high-speed spindles.
Material & Thermal Stability: Constructed from high-grade chrome steel for rings and balls, the bearing offers excellent durability and wear resistance. The phenolic cage provides good dimensional stability across the operating temperature range of -30°C to 110°C.
71908 CD/P4ADBB Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning centers requiring extreme precision and rigidity.
- Precision Rotary Tables: Indexing and positioning systems in automated manufacturing.
- High-Frequency Motors: Spindles for PCB drilling and high-speed electric motors.
- Medical Equipment: Dental handpieces and precision laboratory instruments.
- Aerospace & Defense: Gyroscopes, radar systems, and other high-accuracy rotational mechanisms.
