S71930 ACDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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S71930 ACDGA/HCP4A Bearing Product Overview & Core Advantages
The S71930 ACDGA/HCP4A is a high-precision, single-row angular contact ball bearing engineered for demanding applications requiring exceptional accuracy and reliability. Its design excels at simultaneously handling combined radial and axial loads in one direction. A key feature is its Universal Matchable (SU) designation, allowing two bearings to be precisely paired for optimal preload and performance in a back-to-back (DB) or face-to-face (DF) arrangement. Manufactured to the stringent P4A tolerance class and featuring a ceramic ball and phenolic cage construction, this bearing delivers superior high-speed capability, rigidity, and extended service life.
S71930 ACDGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Interpretation | Technical Significance |
|---|---|---|
| S7 | Bearing Series | Indicates a high-precision angular contact bearing series. |
| 1930 | Size Code | Denotes the bearing dimensions: 150mm bore, 210mm outside diameter, 28mm width. |
| AC | Contact Angle | Specifies a 25° contact angle, optimized for high axial load capacity. |
| D | Internal Design | Refers to specific internal geometry optimizations. |
| GA | Preload | Signifies Extra light preload / Class A for minimal friction and high-speed operation. |
| HC | Hybrid Ceramic | Indicates the use of ceramic balls for reduced weight, lower friction, and higher limiting speed. |
| P4A | Tolerance Class | Denotes a super-precision tolerance class for exceptional running accuracy. |
S71930 ACDGA/HCP4A Bearing Structural Features & Performance Benefits
Hybrid Ceramic Construction: The combination of chrome steel rings and silicon nitride (Si3N4) ceramic balls significantly reduces centrifugal forces, lowers operating temperature, and enables a higher limiting speed (11,000 rpm) compared to all-steel equivalents. This construction also offers superior resistance to electrical erosion.
Phenolic Cage: The lightweight and robust phenolic resin cage ensures excellent dimensional stability and guidance under high-speed rotation, contributing to smooth operation and long-term reliability.
High Load Capacity & Rigidity: The 25° contact angle and precision-ground raceways provide high axial and radial load ratings (24,300 lbf dynamic / 28,125 lbf static), ensuring high rigidity and minimal deflection in the application.
Sealed & Pre-lubricated: The sealed design with grease lubrication protects against contamination and provides maintenance-free operation within the specified temperature range (-30°C to 110°C).
S71930 ACDGA/HCP4A Bearing Typical Application Areas
The S71930 ACDGA/HCP4A is ideally suited for high-performance machinery where precision, speed, and reliability are paramount. Key application fields include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling, engraving machines, and dental handpieces.
- High-Frequency Motors & Turbomachinery: Where extreme rotational speeds are required.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and auxiliary power units.
