71805 ACD/P4DGA
71800 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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Product Overview and Core Advantages
The 71805 ACD/P4DGA is a precision angular contact ball bearing designed for applications demanding exceptional accuracy and performance. This universal matchable bearing (SU) is part of a pre-determined set of two, allowing for simplified installation and optimal performance in preloaded arrangements. Its extra light preload (Class A) and P4 tolerance class ensure smooth, quiet operation with minimal runout, making it ideal for high-speed spindles and other precision machinery. The bearing is pre-lubricated for immediate use and operates effectively within a temperature range of -30°C to 110°C.
71805 ACD/P4DGA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71805 | Basic bearing series and size designation (25mm bore, 37mm OD, 14mm width) |
| AC | Angular Contact design, optimized for combined radial and axial loads |
| D | High contact angle of 25°, providing superior axial load capacity |
| P4 | Precision tolerance class, ensuring high running accuracy and minimal vibration |
| DGA | Universal Matchable (SU) designation, indicating the bearing is supplied in a set of two for universal (face-to-face or back-to-back) mounting |
Structural Features and Performance Benefits
High Precision and Rigidity: Manufactured to P4 tolerance standards, this bearing delivers exceptional dimensional accuracy and rotational precision. The 25° contact angle and optimized internal geometry provide high rigidity, making it suitable for applications requiring precise shaft positioning.
Superior Load Capacity: As an angular contact bearing, the 71805 ACD/P4DGA is engineered to support significant combined loads (simultaneous radial and axial forces). The high contact angle specifically enhances its axial load carrying capacity.
Optimized High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, contributing to a high limiting speed of 103,000 rpm. This, combined with the precision-ground components, ensures stable operation at high rotational velocities.
Universal Matching Capability: Supplied as a universal matchable set (SU), these two bearings can be arranged in various configurations (face-to-face, back-to-back) to accommodate different application requirements for preload and stiffness, simplifying the design and assembly process.
71805 ACD/P4DGA Bearing Typical Application Areas
- High-Speed Machine Tool Spindles
- Precision Grinding Spindles
- High-Frequency Motors
- Medical and Dental Equipment Drives
- Aerospace Instrumentation
- Robotic Arm Joints and Drives
