7044 ACD/P4ADGA
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7044 ACD/P4ADGA
Basic Information
System of measurement
Metric
Weight
32.1 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
340 mm
Outside diameter tolerance
-0.004mm to 0
Width
112 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
38.1 mm
Ball quantity
21
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
117000 lbf
Radial static load rating
198000 lbf
Limiting speed
6.3 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
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In Stock
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7044 ACD/P4ADGA Bearing Product Overview & Core Advantages
The 7044 ACD/P4ADGA is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. As part of the Universal Matchable (SU) series, it is engineered to be paired with a second, identical bearing to form a pre-loaded duplex set, delivering superior performance under combined loads. Its P4A tolerance class and Extra light preload (Class A) make it an ideal choice for high-speed spindles and other precision machinery where minimal runout and high system stiffness are critical.
7044 ACD/P4ADGA Bearing Model Code Explained, Specifications & Naming Convention
The model number 7044 ACD/P4ADGA provides a detailed technical specification:
- 7044: Basic bearing series, indicating a 220 mm bore, 340 mm outside diameter, and 112 mm width.
- A: Denotes a 25° contact angle, optimized for carrying high axial loads.
- CD: Signifies that the bearing is supplied as a Universal Matchable (SU) duplex set. The "CD" pairing arrangement provides a specific preload and rigidity when mounted face-to-face or back-to-back.
- P4A: The tolerance class, indicating very high precision for both dimensional and running accuracy, exceeding standard ABEC 7 / ISO Class 4.
- DGA: Indicates the bearing is lubricated with a specific grease suitable for the designated operating range.
7044 ACD/P4ADGA Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex set configuration and 25° contact angle provide exceptional resistance to moment loads and enable high combined radial and axial load carrying capacity.
- Precision Performance: Manufactured to P4A tolerance class with an Extra light preload, this bearing ensures minimal vibration and extreme running accuracy for demanding applications.
- Optimized for High Speeds: The lightweight phenolic resin cage reduces centrifugal forces, contributing to a high limiting speed of 6,300 rpm. The open design and specialized lubrication facilitate efficient heat dissipation.
- Superior Material Construction: Made from high-grade chrome steel for both rings and balls, ensuring long service life and consistent performance under heavy loads.
7044 ACD/P4ADGA Bearing Typical Application Areas
The 7044 ACD/P4ADGA is specified for high-performance machinery where precision and speed are paramount. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Gearboxes
- High-Frequency Motors
- Aerospace Positioning Systems
- Medical and Laboratory Equipment
