71908 CE/P4ADBB
71900 Series Super Precision Angular Contact Ball Bearings
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71908 CE/P4ADBB Bearing Product Overview & Core Advantages
The 71908 CE/P4ADBB is a super-precision angular contact ball bearing designed for the most demanding applications. As part of a duplex back-to-back (DB) matched set, it delivers exceptional rotational accuracy and system rigidity. Its key advantages include the ability to support combined loads (radial and axial), high limiting speed capabilities, and outstanding operational stability due to its P4A tolerance class and light preload. This configuration is ideal for applications requiring high precision and minimal runout.
71908 CE/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
The model number 71908 CE/P4ADBB provides detailed technical specifications:
- 71908: Basic bearing series and size designation (40mm bore, 62mm OD, 24mm width).
- C: 15° contact angle, optimized for high-speed applications with moderate axial loads.
- E: Designates a high-capacity internal geometry with optimized ball size and quantity.
- P4A: Denotes an ultra-precision tolerance class exceeding ABEC 7, ensuring extremely tight dimensional and running accuracy.
- DBB: Indicates the bearings are supplied as a Duplex Back-to-Back (DB) matched set of two bearings, pre-configured to provide high rigidity against moment loads.
71908 CE/P4ADBB Bearing Structural Features & Performance Benefits
The design of the 71908 CE/P4ADBB translates directly into superior performance:
- High Rigidity & Moment Load Capacity: The duplex back-to-back arrangement creates a wide effective spread, significantly increasing system stiffness and resistance to overturning moments.
- Optimized Internal Geometry: The high-capacity (E) design with a 15° contact angle and 19 balls provides an excellent balance between radial dynamic load rating (3578 lbf) and high-speed capability.
- Super-Precision Performance: Manufactured to P4A tolerance class, this bearing ensures minimal vibration and exceptional running accuracy for critical spindles.
- High-Speed Suitability: The phenolic cage is lightweight and exhibits excellent performance at high speeds, contributing to the high limiting speed of 56,000 rpm. The standard lubrication is suitable for the specified operating range.
- Preload & Accuracy: The light preload (Class B) in the matched set minimizes axial and radial play, ensuring precise shaft positioning and immediate response to load changes.
71908 CE/P4ADBB Bearing Typical Application Areas
This high-precision bearing is engineered for advanced machinery where accuracy and speed are paramount. Key applications include:
- High-Frequency Machine Tool Spindles
- Precision Grinding Spindles
- High-Speed Robotic Drives
- Advanced Medical Equipment Spindles (e.g., Dental drills, CNC surgical devices)
- Aerospace Instrumentation and navigation systems
