71944 ACD/P4ADBC
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71944 ACD/P4ADBC
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
Moderate / Class C
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/P4ADBC Bearing Product Overview & Core Advantages
The 71944 ACD/P4ADBC is a precision duplex angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This matched back-to-back (DB) arrangement is preloaded to Moderate/Class C standards, providing superior stability and resistance to complex combined loads, including significant radial and axial forces. Manufactured to P4A tolerance class, it delivers high running accuracy, making it an ideal choice for high-precision, high-rigidity systems where uncompromising performance is critical.
71944 ACD/P4ADBC Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| ACD | Angular Contact Design, optimized for combined loads with a 25° contact angle. |
| P4A | High precision tolerance class, ensuring extremely tight dimensional and running accuracy. |
| DB | Duplex Back-to-Back arrangement. This configuration provides high moment rigidity and is preloaded for optimal performance. |
| C | Moderate preload specification (Class C), offering a balance between rigidity and operational smoothness. |
71944 ACD/P4ADBC Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The back-to-back duplex design and moderate preload create an exceptionally rigid bearing system that effectively resists moment loads and shaft deflection, ensuring precise positioning.
- Superior Load Capacity: With a 25° contact angle and a dynamic load rating of 76,050 lbf, this bearing is engineered to handle significant combined radial and axial loads simultaneously.
- Precision Performance: Manufactured to P4A tolerance class with a phenolic cage, this bearing guarantees high running accuracy, reduced vibration, and smooth operation at high speeds, with a limiting speed of 11,000 rpm.
- Optimized for Performance: The open design is factory lubricated and features a phenolic cage, which is lightweight and promotes smoother operation and lower operating temperatures at high speeds.
71944 ACD/P4ADBC Bearing Typical Application Areas
This bearing is ideally suited for high-precision machinery and systems requiring maximum rigidity and accuracy, including:
- Machine Tool Spindles (e.g., milling, grinding, and turning centers)
- Precision Gearboxes and Transmission Systems
- High-speed Pumps and Compressors
- Industrial Robotics and Automation equipment
