71956 ACDGA/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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71956 ACDGA/P4A Bearing Product Overview & Core Advantages
The 71956 ACDGA/P4A is a single row angular contact ball bearing designed for applications demanding ultra-high precision and superior performance under combined loads. Positioned in the P4A tolerance class, it offers exceptional dimensional accuracy and running precision. Its key advantage lies in its ability to efficiently handle significant radial loads combined with axial loads in one direction, making it ideal for high-speed spindles and other precision machinery requiring high rigidity and operational stability. The bearing is universally matchable (SU), allowing for flexible mounting arrangements in sets to accommodate complex load requirements.
71956 ACDGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71956 | Basic bearing series and size designation. |
| AC | Angular Contact design with a 25° contact angle. |
| DGA | Specific internal design and cage type. The phenolic cage is lightweight and suitable for high-speed operation. |
| P4A | Indicates an ultra-precision tolerance class exceeding ABEC 7/ISO P4 standards, ensuring minimal runout and vibration. |
71956 ACDGA/P4A Bearing Structural Features & Performance Benefits
High Precision and Rigidity: Manufactured to P4A tolerance class with tight dimensional control on the bore diameter (280 mm) and outside diameter (380 mm), this bearing provides exceptional rotational accuracy and system stiffness, crucial for machining precision.
Optimized Load Capacity: The 25° contact angle and robust construction using chrome steel rings and balls enable high radial dynamic load rating (62,100 lbf) and static load rating (96,750 lbf), effectively managing combined radial and axial loads.
Superior High-Speed Performance: The lightweight phenolic cage minimizes centrifugal forces, contributing to a high limiting speed of 7,500 rpm. The bearing is pre-lubricated for immediate operation.
Universal Matching Capability (SU): This feature allows multiple bearings to be mounted in a matched set (e.g., in tandem or back-to-back configurations) to share loads and achieve desired preload levels, enhancing application flexibility and system performance.
71956 ACDGA/P4A Bearing Typical Application Areas
The 71956 ACDGA/P4A is engineered for the most demanding precision applications, including:
- High-Speed Machine Tool Spindles for milling, grinding, and turning centers.
- Precision Grinding Spindles requiring minimal runout and high rigidity.
- High-frequency Main Spindles and Ball Screw Support Units.
- Other high-performance rotary equipment in aerospace and semiconductor manufacturing.
