7044 ACD/P4A
7000 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
7044 ACD/P4A
Basic Information
System of measurement
Metric
Weight
16.1 kg
Tolerance class
P4 (ABEC-7)
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
220 mm
Bore diameter tolerance
-0.012mm to 0
Outside diameter
340 mm
Outside diameter tolerance
-0.015mm to 0
Width
56 mm
Width tolerance
-0.3mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
38.1 mm
Ball quantity
21
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
71775 lbf
Radial static load rating
99000 lbf
Limiting speed
5.3 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Preload
Available
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 5036.95
/ each
In Stock
- Fast delivery
- Free shipping on orders over $200
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
7044 ACD/P4A Bearing Product Overview & Core Advantages
The 7044 ACD/P4A is a single row angular contact ball bearing engineered for applications demanding high precision and superior performance. Positioned in the P4 (ABEC-7) tolerance class, it guarantees exceptional running accuracy. Its key advantage lies in its ability to accommodate combined loads, efficiently handling substantial radial loads and axial loads in one direction simultaneously. The bearing is supplied with a preload, ensuring high system rigidity, minimal runout, and precise shaft positioning, making it ideal for high-speed, high-rigidity spindles and other precision machinery.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 7044 | Basic bearing series and size designation. |
| AC | Angular Contact design with a 25° contact angle. |
| D | Signifies a high capacity internal design with a larger ball complement and optimized raceway geometry. |
| /P4A | Denotes a P4 tolerance class (equivalent to ABEC-7) and specific preload designation (A). |
7044 ACD/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The single row angular contact design, combined with a P4 precision rating and factory-applied preload, delivers exceptional stiffness and running accuracy, critical for minimizing deflection in demanding applications.
- Superior Load Capacity: The high-capacity "D" design incorporates a larger number of balls (21 balls) and a larger ball diameter (38.1 mm), resulting in high dynamic and static load ratings (71,775 lbf and 99,000 lbf respectively) for reliable operation under significant combined loads.
- Optimized High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, while the 25° contact angle provides an excellent balance between radial load capacity and axial load capacity, contributing to a high limiting speed of 5,300 rpm.
- Material and Lubrication: Manufactured from high-grade chrome steel for rings and balls, ensuring durability and long service life. The bearing is pre-lubricated for immediate operation upon installation.
7044 ACD/P4A Bearing Typical Application Areas
This precision bearing is ideally suited for high-performance applications where accuracy, speed, and rigidity are paramount. Key sectors include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: Applications in PCB drilling, high-frequency motors, and dental handpieces.
- Industrial Pumps and Compressors: For axial and radial load support in high-speed rotating assemblies.
- Robotics and Automation: High-accuracy rotary joints and arm actuators.
