7044 ACDGA/P4A
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7044 ACDGA/P4A
Basic Information
System of measurement
Metric
Weight
16.1 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
56 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
71775 lbf
Radial static load rating
99000 lbf
Limiting speed
6.3 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Number of bearings in matched set
3
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
No drawings available at the moment, will be launched soon
In Stock
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7044 ACDGA/P4A Bearing Product Overview & Core Advantages
The 7044 ACDGA/P4A is a super-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. Manufactured to P4A tolerance class, it guarantees minimal runout and superior dimensional stability. Its 25° contact angle and extra light preload (Class A) are optimized for high-speed operation while providing excellent resistance to combined loads. The phenolic cage and universal matching (SU) capability make it an ideal choice for high-precision, high-reliability spindle arrangements.
7044 ACDGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Suffix | Technical Meaning |
|---|---|
| A | Signifies 25° contact angle and Extra Light Preload (Class A), optimized for high-speed applications with minimal friction. |
| CDGA | Indicates a Universal Matchable (SU) bearing designed for pre-set, multi-bearing arrangements. This specific bearing is one of a matched set of 3. |
| P4A | Denotes an ABEC 7 / ISO P4A tolerance class, representing the highest level of running accuracy for precision spindles. |
7044 ACDGA/P4A Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The single-row, angular contact design with a 25° contact angle provides high rigidity and can support significant combined radial and axial loads.
- Super-Precision Performance: Manufactured to P4A tolerance standards with tight dimensional tolerances on bore, outside diameter, and width, ensuring exceptional running accuracy and system stability.
- High-Speed Capability: The phenolic resin cage offers low weight and excellent performance at high speeds, contributing to a limiting speed of 6,300 rpm. The optimized internal geometry further enhances high-speed operation.
- Universal Matching: As part of a Universal Matchable (SU) set, these bearings can be mounted in tandem to create a rigid, pre-loaded spindle unit without the need for selective mounting, simplifying installation and improving performance consistency.
7044 ACDGA/P4A Bearing Typical Application Areas
This precision angular contact bearing is engineered for the most demanding applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling, semiconductor manufacturing equipment.
- High-Frequency Motors and other applications requiring extreme rotational accuracy and speed.
