71940 ACD/HCP4A
Hybrid Ceramic Super Precision Bearings
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71940 ACD/HCP4A Bearing Product Overview & Core Advantages
The 71940 ACD/HCP4A is a high-precision single row angular contact ball bearing engineered for demanding applications requiring exceptional accuracy and performance. Its primary advantage lies in its ability to handle significant combined loads (radial and axial) simultaneously, thanks to its specific 25° contact angle. Manufactured to P4 (ABEC-7) tolerance class, it guarantees superior running accuracy and rotational stability. The combination of a phenolic cage and ceramic balls contributes to its high-speed capabilities, low friction, and extended service life, making it an ideal choice for high-reliability, high-rigidity spindle systems.
71940 ACD/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| 71940 | Basic bearing series and size code (200mm bore, 280mm OD, 38mm width). |
| AC | Angular Contact design with a 25° contact angle. |
| D | Signifies a high load carrying capacity internal design. |
| HC | Hybrid Ceramic: Indicates the use of ceramic balls. |
| P4 | Specifies the P4 (ABEC-7) tolerance class for high precision. |
| A | Indicates that the bearing is supplied with a specific preload. |
71940 ACD/HCP4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The single row angular contact design, coupled with P4 precision and a preload, ensures minimal deflection and superior system stiffness, which is critical for machining accuracy.
- Enhanced Load Capacity: The optimized internal geometry (suffix D) and 25° contact angle enable the bearing to support high combined radial and axial loads effectively.
- Superior High-Speed Performance: The lightweight phenolic cage and low-density ceramic balls reduce centrifugal forces, allowing for a high limiting speed of 7,500 rpm. This hybrid construction also minimizes heat generation.
- Reduced Maintenance & Long Life: Ceramic balls are harder, more wear-resistant, and electrically insulating compared to steel, leading to dramatically extended lubrication life and overall bearing longevity, especially in challenging environments.
71940 ACD/HCP4A Bearing Typical Application Areas
The 71940 ACD/HCP4A is ideally suited for high-performance machinery where precision, speed, and reliability are paramount. Key applications include:
- Machine Tool Spindles: CNC machining centers, grinding spindles, and high-speed milling heads.
- Precision Rotary Systems: High-speed robotics, rotary tables, and indexing heads.
- Advanced Medical Equipment: Dental handpieces and imaging device rotors.
- Aerospace & Defense Systems: Gyroscopes, radar platforms, and auxiliary power units (APUs).
