71944 ACD/P4ADBD
71900 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
71944 ACD/P4ADBD
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
Heavy / Class D
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
Price available upon request.
Our sales team will respond within 24 hours with a competitive quote tailored to your requirements.
REQUEST A QUOTE
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
71944 ACD/P4ADBD Bearing Product Overview & Core Advantages
The 71944 ACD/P4ADBD is a precision duplex angular contact ball bearing designed for applications demanding exceptional rigidity and accuracy. This matched back-to-back (DB) arrangement features a Heavy (Class D) preload, delivering superior stiffness and rotational accuracy under combined loads. Manufactured to ABEC 7 / P4A tolerance class, it is engineered for high-performance scenarios requiring precise shaft positioning and minimal runout. Its open design allows for customized lubrication schemes to optimize performance in demanding environments.
71944 ACD/P4ADBD Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning | Advantage |
|---|---|---|
| ACD | Angular Contact, Duplex (Matched Set) | Indicates a pre-matched pair of bearings supplied as a set. |
| P4A | High Precision Tolerance Class (ABEC 7 equivalent) | Ensures extremely tight dimensional and running accuracy for high-speed, high-precision applications. |
| DB | Back-to-Back Mounting Arrangement | Provides high moment rigidity and excellent stability under complex load conditions. |
71944 ACD/P4ADBD Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex back-to-back (DB) design with a Heavy preload creates a highly rigid bearing system capable of withstanding significant combined radial and axial loads. The 25° contact angle is optimized for carrying substantial thrust loads.
- Precision Performance: Manufactured to P4A tolerance class with extremely tight bore, OD, and width tolerances, this bearing ensures minimal runout and precise shaft guidance, which is critical for high-speed operation up to 11,000 rpm.
- Advanced Material Construction: The chrome steel rings and balls provide high fatigue life and durability. The phenolic resin cage offers excellent strength-to-weight ratio, reduced friction, and is suitable for high-speed applications.
- Optimized Internal Geometry: With 29 balls of 25.4 mm diameter, the bearing achieves a high dynamic load rating of 76,050 lbf and a static load rating of 128,250 lbf, ensuring long service life under heavy loads.
71944 ACD/P4ADBD Bearing Typical Application Areas
The 71944 ACD/P4ADBD is ideally suited for high-precision, high-stiffness machinery, including:
- Machine Tool Spindles: For milling, grinding, and turning centers requiring high rigidity and accuracy.
- Precision Gearboxes: Especially in industrial robotics and aerospace drive systems.
- High-Speed Pumps and Compressors: Where reliable performance under combined loads is essential.
- Medical and Laboratory Equipment: Such as high-speed centrifuges and imaging devices.
