71944 ACD/P4ADBA
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71944 ACD/P4ADBA
Basic Information
System of measurement
Metric
Weight
13.2 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
76 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
25.4 mm
Ball quantity
29
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
76050 lbf
Radial static load rating
128250 lbf
Limiting speed
11 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Duplex Back-to-Back (DB)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
Preload
Extra light / Class A
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
In Stock
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71944 ACD/P4ADBA Bearing Product Overview & Core Advantages
The 71944 ACD/P4ADBA is a precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This duplex back-to-back (DB) arrangement provides superior stability and can accommodate combined radial and axial loads simultaneously. Manufactured to P4A tolerance class with an extra light preload (Class A), it ensures minimal runout and optimal performance in high-speed, high-precision environments. Its robust construction and phenolic cage make it ideal for applications where high rigidity and reliability are paramount.
71944 ACD/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| ACD | Angular Contact Design with a 25° contact angle, optimized for high axial load capacity. |
| P4A | High precision tolerance class, exceeding ABEC 7 standards, ensuring extremely tight dimensional and running accuracy. |
| DB | Duplex Back-to-Back arrangement. This matched set of two bearings increases system rigidity and moment load capacity. |
71944 ACD/P4ADBA Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The duplex back-to-back (DB) configuration creates a wide effective spread, significantly enhancing system rigidity and resistance to moment loads, which is critical for maintaining precision under heavy combined loads.
- Superior Load Capacity: With a 25° contact angle and a radial dynamic load rating of 76,050 lbf, this bearing is engineered to handle significant radial and axial loads simultaneously.
- High-Speed Capability: The lightweight phenolic cage reduces centrifugal forces, allowing for a high limiting speed of 11,000 rpm. The open design facilitates efficient lubrication and heat dissipation.
- Precision Performance: The P4A tolerance class and extra light preload guarantee minimal vibration and exceptional running accuracy, making it suitable for ultra-precise spindles.
- Durable Construction: Components made from chrome steel provide high hardness and wear resistance, ensuring long service life under demanding conditions.
71944 ACD/P4ADBA Bearing Typical Application Areas
This bearing is specifically designed for high-performance machinery where precision and speed are critical. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles: Applications requiring the highest levels of accuracy and surface finish.
- High-Frequency Motors: Spindles for PCB drilling and other high-RPM electric motors.
- Aerospace & Defense Systems: Gyroscopes, radar equipment, and other precision instruments.
