71944 ACD/P4ATBTA
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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71944 ACD/P4ATBTA Bearing Product Overview & Core Advantages
The 71944 ACD/P4ATBTA is a **high-precision angular contact ball bearing** designed for demanding applications requiring exceptional rigidity and accuracy. As part of a **matched triplex back-to-back (TBT) set**, this bearing is engineered to handle **combined radial and axial loads** simultaneously. Its **P4A tolerance class** ensures ultra-precise running accuracy, making it ideal for high-speed spindles and other **high-precision machinery**. The **extra light preload (Class A)** provides optimal stiffness with minimal friction, contributing to superior performance in **high-rigidity applications**.
71944 ACD/P4ATBTA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71944 | Basic bearing series and size designation |
| ACD | **Angular Contact** design with a **25° contact angle** |
| P4A | **High-precision tolerance class** (exceeds ABEC 7/ISO P4) |
| TB | **Back-to-Back** mounting arrangement |
| T | **Triplex set** (three bearings matched together) |
| A | **Extra light preload** classification |
71944 ACD/P4ATBTA Bearing Structural Features & Performance Benefits
This bearing's performance is derived from its sophisticated design and material selection:
- High Rigidity & Load Capacity: The **triplex back-to-back configuration** creates an extremely rigid bearing system capable of withstanding heavy **combined loads** and moment loads. With a **radial dynamic load rating of 101,025 lbf** and **static load rating of 191,250 lbf**, it delivers exceptional load-bearing performance.
- Precision Engineering: Manufactured to **P4A tolerance class** with tight dimensional tolerances (bore: -0.004mm to 0, OD: -0.004mm to 0) ensuring minimal runout and vibration for **high-precision applications**.
- Optimized High-Speed Performance: The **phenolic cage material** and **25° contact angle** are optimized for **high-speed operation** up to **11,000 rpm**, providing excellent stability and reduced centrifugal forces.
- Superior Material Construction: Made from **chrome steel** for both rings and balls, offering high hardness, wear resistance, and dimensional stability across the **temperature range of -30°C to 110°C**.
- Precision Ball Configuration: Features **29 balls with 25.4 mm diameter** strategically arranged to maximize load distribution and rotational accuracy.
71944 ACD/P4ATBTA Bearing Typical Application Areas
The 71944 ACD/P4ATBTA is specifically engineered for high-performance applications including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers requiring **ultra-precision** and **high rigidity**
- Precision Gearboxes: Industrial transmission systems demanding accurate rotational performance
- High-Speed Motors: Spindle motors and other high-RPM industrial drives
- Aerospace Components: Critical rotating assemblies where precision and reliability are paramount
- Medical Equipment: High-speed dental drills and surgical handpieces
- Robotics: Precision joints and articulation points in industrial robots
