71944 CD/P4ATBTB
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71944 CD/P4ATBTB
Basic Information
System of measurement
Metric
Weight
19.8 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
220 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
300 mm
Outside diameter tolerance
-0.004mm to 0
Width
114 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
25.4 mm
Ball quantity
29
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
106875 lbf
Radial static load rating
202500 lbf
Limiting speed
11 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Triplex Back-to-Back (TBT)
Number of bearings in matched set
3
Universal matching bearing
No (Standard)
Preload
Light / Class B
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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In Stock
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71944 CD/P4ATBTB Bearing Product Overview & Core Advantages
The 71944 CD/P4ATBTB is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This triplex back-to-back (TBT) matched set consists of three preloaded bearings, delivering superior stiffness and stability under complex combined loads. Manufactured to P4A tolerance class, it ensures minimal runout and is ideal for high-speed, high-rigidity spindles and precision machinery where uncompromising performance is critical.
71944 CD/P4ATBTB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71944 | Basic bearing series and size designation. |
| CD | Specific internal design and contact angle of 15°. |
| P4A | Indicates a high-precision tolerance class for exceptional dimensional and running accuracy. |
| TBT | Denotes a Triplex Back-to-Back matched arrangement of three bearings. |
71944 CD/P4ATBTB Bearing Structural Features & Performance Benefits
- Exceptional Rigidity and Stability: The triplex back-to-back (TBT) arrangement creates a highly rigid bearing system that effectively resists moment loads and shaft deflection, making it suitable for applications requiring maximum system stiffness.
- Superior Load Capacity: The angular contact design with a 15° contact angle enables the bearing set to handle significant combined radial and axial loads simultaneously.
- High-Speed Capability: The lightweight phenolic cage minimizes centrifugal forces, contributing to a high limiting speed of 11,000 rpm. The open design facilitates efficient lubrication management for optimal thermal performance at high speeds.
- Precision Performance: Manufactured to P4A tolerance class with tight dimensional controls on bore, outside diameter, and width, ensuring precise shaft positioning and smooth, quiet operation.
- Optimized Component Materials: Constructed from chrome steel for rings and balls, providing high fatigue life and wear resistance.
71944 CD/P4ATBTB Bearing Typical Application Areas
This precision bearing set is engineered for high-performance applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: For PCB drilling, semiconductor manufacturing, and other high-accuracy machining.
- High-Frequency Motors: Where high rigidity and rotational accuracy are paramount.
- Industrial Pumps and Compressors: For applications demanding high shaft stability.
