71944 CD/P4ADGA
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71944 CD/P4ADGA
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
15 °
Ball & Washer Dimensions
Ball diameter
25.4 mm
Ball quantity
29
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
80550 lbf
Radial static load rating
135000 lbf
Limiting speed
11 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Universal Matchable (SU)
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
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 CD/P4ADGA Bearing Product Overview & Core Advantages
The 71944 CD/P4ADGA is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. As a universal matchable (SU) bearing supplied in a pre-matched set of 2, it is engineered to accommodate combined loads (radial and axial) simultaneously. Its P4A tolerance class and extra light preload (Class A) ensure smooth, high-precision operation, making it ideal for high-speed spindles and other high-reliability applications where minimal runout and thermal stability are critical.
71944 CD/P4ADGA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71944 | Basic bearing designation, defining the standard metric dimensions (Bore: 220 mm, OD: 300 mm, Width: 76 mm). |
| CD | A 15° contact angle and specific internal design optimized for high-speed operation and universal matching. |
| P4A | Indicates a high-precision tolerance class with enhanced running accuracy and dimensional stability. |
| DGA | Specifies the universal matchable (SU) arrangement and the extra light preload (Class A) applied to the bearing set. |
71944 CD/P4ADGA Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The angular contact design and use of 29 high-quality chrome steel balls enable the bearing to support significant combined radial and axial loads (Dynamic: 80,550 lbf, Static: 135,000 lbf), providing a stiff and stable rotational axis.
- Precision & High-Speed Performance: Manufactured to P4A tolerance class with extremely tight dimensional tolerances, this bearing ensures minimal vibration and precise running. The phenolic cage and optimized internal geometry contribute to a high limiting speed of 11,000 rpm, making it suitable for demanding high-speed applications.
- Thermal & Operational Stability: The universal matchable (SU) design allows for flexible mounting configurations (DB, DF, DT) while maintaining pre-set preload and optimal performance. The extra light preload minimizes friction and heat generation, enhancing operational lifespan.
- Durability: Constructed from through-hardened chrome steel for rings and balls, the bearing offers excellent wear resistance and long-term dimensional stability under high-speed and precision conditions.
71944 CD/P4ADGA Bearing Typical Application Areas
This bearing is specifically engineered for high-performance machinery where precision, speed, and rigidity are non-negotiable. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles: Internal and external grinding machines requiring extreme accuracy.
- High-Frequency Motors and High-Speed Drives.
- Industrial Pumps and Compressors operating at high rotational speeds.
