71805 ACDGC/P4
71800 Series Super Precision Angular Contact Ball Bearings
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Main Dimensions
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71805 ACDGC/P4 Bearing Product Overview & Core Advantages
The 71805 ACDGC/P4 is a single-row angular contact ball bearing engineered for applications demanding high precision and exceptional running accuracy. Positioned in the P4 tolerance class, it guarantees minimal dimensional and rotational runout deviations. Its defining characteristic is a 25° contact angle, optimized to support significant combined loads—handling both radial and axial forces simultaneously with high efficiency. The bearing is pre-lubricated and features a phenolic resin cage, contributing to its suitability for high-speed operation up to 103,000 rpm. As part of a Universal Matchable (SU) set, it can be precisely mounted with other bearings to create a rigid, preloaded arrangement, making it an ideal component for compact, high-performance spindle assemblies.
71805 ACDGC/P4 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 71805 | Basic bearing series and size designation (25mm bore, 37mm OD, 7mm width). | Defines the core bearing dimensions. |
| AC | Angular Contact design. | Enables handling of combined radial and axial loads. |
| D | High Ball Complement. | Increases load capacity and rigidity. |
| GC | Specific internal clearance and preload group for moderate preload (Class C). | Optimizes bearing stiffness and running accuracy for matched sets. |
| P4 | Tolerance class per ISO standards. | Denotes high precision with tight tolerances on bore, OD, and width. |
71805 ACDGC/P4 Bearing Structural Features & Performance Benefits
High Rigidity and Load Capacity: The combination of a 25° contact angle and a high ball complement (D) provides superior resistance to deflection under combined loads, ensuring stable and precise shaft positioning. The phenolic cage contributes to this rigidity while maintaining low mass.
Superior High-Speed Performance: The lightweight phenolic resin cage is engineered for stability at high rotational speeds, minimizing centrifugal forces and friction. This, combined with the optimized internal geometry, allows the bearing to achieve a limiting speed of 103,000 rpm.
Precision and Accuracy: Manufactured to P4 tolerance class, this bearing guarantees extremely tight dimensional and runout tolerances. This is critical for applications requiring minimal vibration and high rotational accuracy.
Universal Matching Capability (SU): This bearing is designed to be universally matchable. Multiple bearings can be selectively assembled in any combination to achieve a specific preload (Moderate / Class C in this case) without the need for individual selection, simplifying installation and ensuring consistent performance in multi-bearing arrangements.
71805 ACDGC/P4 Bearing Typical Application Areas
- High-Frequency Spindles for PCB drilling and precision machining
- Precision Grinding Spindles
- High-speed axes in Machine Tools
- Rotary assemblies in Precision Instruments and optical scanners
- Turbochargers and other high-speed compressor shafts
