71930 CD/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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Materials
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71930 CD/P4A Bearing Product Overview & Core Advantages
The 71930 CD/P4A is a single-row angular contact ball bearing designed for applications requiring high precision and exceptional rotational accuracy. Engineered to P4 (ABEC-7) tolerance class, this bearing is optimized to accommodate combined loads, primarily thrust loads in one direction, while also supporting significant radial loads. Its 15° contact angle provides an excellent balance between radial and axial load capacity. Pre-loaded and pre-lubricated from the factory, it ensures immediate high-performance operation, making it ideal for high-speed spindles and other precision machinery where rigidity and minimal runout are critical.
71930 CD/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71930 | Basic bearing series and size designation (150mm bore, 210mm OD). |
| C | Specifies a 15° contact angle. |
| D | Indicates the bearing is manufactured with a high-precision preload. |
| P4A | Denotes the P4 (ABEC-7) tolerance class, signifying extremely tight dimensional and running accuracy. |
71930 CD/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The single-row angular contact design with a 15° contact angle and factory-set preload provides high system rigidity, minimizes axial and radial play, and ensures exceptional running accuracy for demanding applications.
- Superior Load Capacity: Engineered to handle significant combined loads, offering high thrust capacity in one direction alongside robust radial load support, as evidenced by its dynamic (25,650 lbf) and static (29,700 lbf) load ratings.
- Optimized High-Speed Performance: The lightweight and durable phenolic resin cage ensures stable operation and guides the balls effectively, contributing to the high limiting speed of 9,500 rpm. The open design and pre-lubrication facilitate efficient heat dissipation.
- Premium Materials for Durability: Constructed from chrome steel for both rings and balls, providing high hardness, wear resistance, and a long operational life under demanding conditions.
71930 CD/P4A Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles: Applications requiring minimal vibration and extreme accuracy.
- High-Frequency Motors and Spindles: Where high rotational speeds and rigidity are paramount.
- Industrial Pumps and Compressors: For supporting axial and radial loads in rotary assemblies.
- Medical and Laboratory Equipment: Precision instruments demanding quiet and reliable operation.
