71944 ACD/P4ADGD
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71944 ACD/P4ADGD
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
Universal Matchable (SU)
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
Preload
Heavy / Class D
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 ACD/P4ADGD Bearing Product Overview & Core Advantages
The 71944 ACD/P4ADGD is a precision angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. Engineered to a P4A tolerance class, it delivers superior running precision. Its defining feature is the Universal Matchable (SU) design, allowing two bearings to be paired in a universal arrangement for optimal performance under combined loads. Preloaded to a Heavy / Class D specification, this bearing provides high system stiffness right from installation, making it ideal for high-precision, high-reliability machinery.
71944 ACD/P4ADGD Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71944 | Basic bearing series and size designation. |
| AC | Angular Contact design with a 25° contact angle. |
| D | Signifies a Heavy / Class D preload for maximum rigidity. |
| P4A | Indicates a high-precision tolerance class exceeding ABEC 7 standards. |
| DGD | Specifies a Universal Matchable (SU) bearing, supplied as one of a pair for duplex mounting. |
71944 ACD/P4ADGD Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The angular contact design and heavy preload provide exceptional resistance to deflection under combined radial and axial loads. With a radial dynamic load rating of 76,050 lbf and a static load rating of 128,250 lbf, it is built for robust performance.
- Precision & Speed: Manufactured to P4A tolerance standards, it ensures minimal runout and vibration. The phenolic cage and optimized internal geometry contribute to a high limiting speed of 11,000 rpm.
- Matched Set Performance: As a Universal Matchable (SU) bearing, it is designed to be paired with another identical bearing. This allows for flexible mounting configurations (back-to-back, face-to-face, or tandem) to precisely control axial play and optimize stiffness for the application.
- Durable Construction: Components made from chrome steel for both rings and balls ensure high durability and fatigue resistance, suitable for a wide temperature range from -30°C to 110°C.
71944 ACD/P4ADGD Bearing Typical Application Areas
This bearing is specified for high-performance applications where precision, rigidity, and speed are critical. Key industries and machinery include:
- Machine Tool Spindles: For milling, grinding, and turning centers requiring high accuracy and stiffness.
- Precision Gearboxes: Especially in high-torque, high-speed industrial drives.
- Industrial Pumps and Compressors: Where reliable operation under significant axial and radial forces is necessary.
- Robotic Arm Joints and Rotary Tables: Demanding high positional accuracy and moment load capacity.
