71809 CD/P4DGB
71800 Series Super Precision Angular Contact Ball Bearings
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71809 CD/P4DGB Bearing Product Overview & Core Advantages
The 71809 CD/P4DGB is a super-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and high-speed capability. As a Universal Matchable (SU) bearing supplied in a pre-loaded duplex set, it delivers superior system rigidity and can accommodate combined radial and axial loads. Manufactured to P4 tolerance class, this bearing is engineered for high reliability in precision machinery and offers optimized performance through its phenolic cage and light preload configuration.
71809 CD/P4DGB Bearing Model Code Explained, Specifications & Naming Convention
- 71809: Basic designation indicating a super-precision angular contact bearing with 45mm bore, 58mm OD, and 14mm width.
- CD: Indicates a duplex pair with a Universal Matchable (SU) arrangement. This allows the two bearings to be mounted in either back-to-back (DB) or face-to-face (DF) configurations to handle combined loads and moments.
- P4: Denotes the tolerance class, corresponding to ISO Class 4 (ABEC 7), ensuring extremely tight dimensional and running accuracy.
- DGB: Indicates a Light preload (Class B). This preload eliminates internal clearance, enhancing stiffness and rotational accuracy while minimizing noise and vibration.
71809 CD/P4DGB Bearing Structural Features & Performance Benefits
The bearing's performance stems from its advanced design: The 15° contact angle provides an excellent balance between radial load capacity and axial load carrying capability. The phenolic cage ensures low weight and excellent performance at high speeds (with a limiting speed of 46,000 rpm), offering reduced friction and smooth operation. The Universal Matchable (SU) duplex set, pre-loaded at the factory, delivers immediate high rigidity and precise shaft positioning without requiring complex adjustment during installation. Manufactured from chrome steel for both rings and balls, it ensures high durability and a long operational life within its specified temperature range of -30°C to 110°C.
71809 CD/P4DGB Bearing Typical Application Areas
This precision bearing is ideally suited for high-performance applications where accuracy and speed are critical. Typical uses include:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers.
- Precision Spindles: In PCB drilling machines and semiconductor manufacturing equipment.
- High-Frequency Motors: Where minimal runout and high rigidity are required.
- Medical Equipment: Such as high-speed dental handpieces and laboratory centrifuges.
- Robotics: In critical joints and arm assemblies requiring precise motion control.
