71917 ACDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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71917 ACDGA/HCP4A Bearing Product Overview & Core Advantages
The 71917 ACDGA/HCP4A is a single-row angular contact ball bearing engineered for applications demanding ultra-high precision and exceptional rotational accuracy. Positioned in the P4A super-precision tolerance class, it is designed to handle combined loads, primarily thrust loads, with high rigidity and stability. Its core advantages include a 25° contact angle for optimal axial load capacity, a lightweight phenolic resin cage for superior high-speed performance, and silicon nitride (Si3N4) ceramic balls that reduce centrifugal forces, lower operating temperatures, and enable higher limiting speeds. This bearing is pre-lubricated and features an open design, making it a premier choice for the most demanding high-speed and high-precision spindle systems.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 71917 | Basic bearing series and size designation (85mm bore, 120mm OD, 18mm width). |
| AC | Angular Contact design with a 25° contact angle. |
| D | High Ball Complement design, increasing the load rating. |
| GA | Indicates a Universal Matchable (SU) bearing, designed to be mounted in pairs (back-to-back or face-to-face) without the need for selective mounting to achieve a specific preload. |
| HC | Hybrid Ceramic: Signifies the use of ceramic balls (Silicon Nitride) and steel rings. |
| P4A | The tolerance class, denoting super-precision levels with very tight running accuracy and dimensional tolerances. |
71917 ACDGA/HCP4A Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The combination of chrome steel rings and silicon nitride ceramic balls significantly reduces friction, heat generation, and wear. This results in a higher limiting speed (28,000 rpm), extended service life, and the ability to operate with minimal lubrication.
- Phenolic Resin Cage: This lightweight and robust cage material is ideal for high-speed applications, offering excellent dimensional stability, low friction, and resistance to centrifugal forces.
- High-Precision & Rigidity: Manufactured to P4A tolerance class with extremely tight dimensional tolerances, this bearing provides superior running accuracy, minimal vibration, and high system rigidity, which is critical for precise positioning.
- Optimized Load Capacity: The 25° contact angle and high ball complement (D) are engineered to support significant axial loads and combined (radial and axial) loads efficiently.
- Universal Matching (SU): The GA suffix ensures that bearings are universally matchable, simplifying installation in preloaded pairs for spindle applications and guaranteeing consistent, high-performance operation.
71917 ACDGA/HCP4A Bearing Typical Application Areas
The 71917 ACDGA/HCP4A is specifically designed for high-performance machinery where precision, speed, and reliability are paramount. Key application areas include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling and routing spindles.
- High-Frequency Motors: Spindles for electric motors operating at very high RPM.
- Aerospace & Defense Systems: Gyroscopes, navigation instruments, and other critical rotating assemblies.
- Medical Equipment: High-speed dental handpieces and surgical drill spindles.
