71930 ACDGC/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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71930 ACDGC/P4A Bearing Product Overview & Core Advantages
The 71930 ACDGC/P4A is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional rotational accuracy and rigidity. As a single-row bearing with a 25° contact angle, it is optimized to support combined loads, handling significant radial forces alongside high unidirectional axial thrust. Its P4A tolerance class ensures ultra-precise dimensional and running accuracy, making it ideal for high-speed spindles and precision machinery. Preloaded with a Moderate / Class C preload, this bearing delivers enhanced system stiffness and minimizes deflection under operational loads, contributing to superior positioning accuracy and dynamic performance.
71930 ACDGC/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71930 | Basic bearing series and size designation (150mm bore, 210mm OD). |
| AC | Angular Contact design with a 25° contact angle. |
| D | High contact angle for increased axial load capacity. |
| GC | Specific internal clearance and preload group (Moderate / Class C preload). |
| P4A | Super-precision tolerance class, exceeding ABEC 7/ISO P4 standards for exceptional running accuracy. |
71930 ACDGC/P4A Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The 25° contact angle and Moderate preload provide high system stiffness, enabling the bearing to effectively manage combined radial and axial loads with minimal deformation.
- Super-Precision Performance: Manufactured to a P4A tolerance class, this bearing guarantees extremely tight dimensional control and low runout, which is critical for applications requiring high rotational accuracy.
- Optimized High-Speed Operation: The lightweight phenolic resin cage ensures excellent dimensional stability and low friction at high speeds, contributing to a limiting speed of 11,000 rpm.
- Universal Matching Design: Designated as Universal Matchable (SU), these bearings can be universally paired in any combination to form precisely preloaded sets (e.g., DB, DF, DT arrangements), simplifying mounting and ensuring optimal performance.
- Premium Material Construction: Manufactured from high-grade chrome steel for rings and balls, ensuring high durability, wear resistance, and a long operational lifespan.
71930 ACDGC/P4A Bearing Typical Application Areas
- Machine Tool Spindles (High-speed milling, grinding, and turning centers)
- Precision Grinding Spindles
- High-Frequency Motors
- Industrial Pumps and Compressors
- Aerospace and Defense Positioning Systems
