71956 CD/P4ADBD
71900 Series Super Precision Angular Contact Ball Bearings
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71956 CD/P4ADBD Bearing Product Overview & Core Advantages
The **71956 CD/P4ADBD** is a **precision duplex angular contact ball bearing** designed for applications requiring exceptional **rigidity** and **high load capacity**. This **metric system** bearing features a **back-to-back (DB) arrangement** with **heavy preload (Class D)**, enabling it to withstand significant **combined radial and axial loads** simultaneously. Manufactured to **P4A tolerance class**, it delivers superior running accuracy and rotational precision, making it ideal for high-performance machinery where **stability** and **long service life** are critical.
71956 CD/P4ADBD Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71956 | Basic bearing series designation |
| CD | **Duplex Back-to-Back** arrangement with **Heavy Preload (Class D)** |
| P4A | **High Precision Tolerance Class** (superior to ABEC 7) |
| DB | **Duplex Back-to-Back** mounting configuration |
71956 CD/P4ADBD Bearing Structural Features & Performance Benefits
Enhanced Rigidity: The **duplex back-to-back configuration** with **heavy preload** creates an extremely **rigid bearing system** that minimizes deflection under heavy loads, ensuring precise shaft positioning and reduced vibration.
Superior Load Capacity: With a **15° contact angle** and optimized internal geometry, this bearing delivers exceptional **combined load capacity**, handling substantial **radial loads** (106,875 lbf dynamic) and **axial loads** in both directions simultaneously.
Precision Performance: Manufactured to **P4A tolerance standards** with **phenolic resin cage** and **chrome steel components**, this bearing provides exceptional running accuracy, smooth operation, and consistent performance in demanding applications.
Optimized Design: Featuring 31 precision balls of **30.162 mm diameter**, the bearing distributes loads evenly across multiple contact points, enhancing **load distribution** and extending service life.
71956 CD/P4ADBD Bearing Typical Application Areas
- Machine Tool Spindles: High-precision machining centers, grinding spindles, and milling machines requiring extreme rigidity and accuracy
- Industrial Gearboxes: Heavy-duty transmission systems where high load capacity and precise shaft alignment are critical
- Precision Rotary Tables: Indexing and positioning systems demanding high rotational accuracy and minimal deflection
- High-Performance Pumps: Applications requiring stable operation under combined radial and axial loads
- Specialized Machinery: Aerospace equipment, robotics, and other advanced mechanical systems needing premium bearing performance
