71809 CD/P4DBB
71800 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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71809 CD/P4DBB Bearing Product Overview & Core Advantages
The 71809 CD/P4DBB is a precision duplex angular contact ball bearing designed for applications requiring exceptional rotational accuracy and rigidity. This metric bearing features a back-to-back (DB) matched arrangement, providing high stiffness and excellent stability under combined radial and axial loads. Manufactured to P4 tolerance class with a light preload (Class B), it is engineered for high-speed operation up to 46,000 rpm, making it an ideal choice for high-precision spindles and other demanding machinery.
71809 CD/P4DBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71809 | Basic bearing series and size designation. |
| CD | Indicates a duplex bearing in a back-to-back (DB) arrangement. |
| P4 | Specifies the tolerance class, denoting high precision with tight dimensional and running accuracy. |
| DBB | Reinforces the back-to-back duplex configuration, optimized for moment load resistance. |
71809 CD/P4DBB Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex back-to-back design creates a wide, rigid support system, significantly increasing the bearing's ability to withstand combined loads and moment loads. The 15° contact angle is optimized for carrying substantial axial loads in both directions.
High-Speed Performance: The phenolic resin cage is lightweight and durable, contributing to smooth operation and reduced centrifugal forces at the limiting speed of 46,000 rpm. The open design facilitates efficient lubrication and heat dissipation.
Precision Engineering: Manufactured to P4 tolerance class with a light preload, this bearing ensures minimal runout and consistent, high-precision performance. The tight dimensional tolerances on the bore diameter and outside diameter guarantee a precise fit.
Material Quality: Constructed from high-grade chrome steel for both rings and balls, ensuring high durability, wear resistance, and a long operational life.
71809 CD/P4DBB Bearing Typical Application Areas
The 71809 CD/P4DBB is ideally suited for high-performance applications where precision and speed are critical. Key industries and equipment include:
- Machine Tool Spindles (e.g., CNC milling, grinding, and high-speed machining centers)
- Precision Rotary Tables and Indexing Heads
- High-Frequency Motors and Spindle Drives
- Medical Equipment (e.g., high-speed dental handpieces, laboratory centrifuges)
- Aerospace Instrumentation and Guidance Systems
