71909 CD/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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71909 CD/P4A Bearing Product Overview & Core Advantages
The 71909 CD/P4A is a single-row angular contact ball bearing engineered for applications demanding high precision and superior performance. This metric bearing is designed to accommodate combined loads, primarily handling significant axial loads in one direction alongside radial loads. Its P4 (ABEC-7) tolerance class ensures exceptional running accuracy, making it ideal for high-speed spindles and other high-rigidity applications. The bearing comes pre-lubricated and is available with a preload, contributing to its operational stability and long service life.
71909 CD/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71909 | Basic bearing series and size designation (45mm bore, 68mm OD, 12mm width). |
| C | Specifies a 15° contact angle, optimized for high-speed operation and axial load capacity. |
| D | Indicates the bearing is part of a matched arrangement (in this case, a single bearing supplied for a specific preload setting). |
| P4A | Denotes a high-precision tolerance class equivalent to ABEC-7, ensuring minimal runout and vibration for demanding applications. |
71909 CD/P4A Bearing Structural Features & Performance Benefits
Optimized Contact Angle and Rigidity: The 15° contact angle is a key structural feature that provides an excellent balance between radial and axial load capacity, while also enhancing the bearing's suitability for high-speed operation.
High-Precision Components: Manufactured from chrome steel for both rings and balls, the bearing offers high durability and wear resistance. The phenolic cage is lightweight and robust, contributing to lower centrifugal forces and smoother operation at the limiting speed of 32,000 rpm.
Preload and Precision: The availability of preload allows for a controlled internal clearance, resulting in increased stiffness and precise shaft positioning, which is critical in machine tool spindles and other high-precision machinery.
Lubrication and Temperature Range: The bearing is supplied pre-lubricated, ensuring immediate operational readiness. Its specified temperature range of -30°C to 110°C allows for reliable performance in various operating environments.
71909 CD/P4A Bearing Typical Application Areas
The 71909 CD/P4A is ideally suited for high-performance applications where precision, high speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy positioning systems.
- High-Frequency Motors and Spindles: Where minimal runout and vibration are required.
- Medical Equipment: Dental handpieces and imaging device rotors.
- Aerospace Instrumentation: Gyroscopes and navigation systems.
