7040 ACDGB/P4A
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7040 ACDGB/P4A
Basic Information
System of measurement
Metric
Weight
12.3 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
200 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
310 mm
Outside diameter tolerance
-0.004mm to 0
Width
51 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
34.925 mm
Ball quantity
21
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
63225 lbf
Radial static load rating
82125 lbf
Limiting speed
16.25 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Number of bearings in matched set
4
Universal matching bearing
Universal Matchable (SU)
Preload
Light / Class B
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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7040 ACDGB/P4A Bearing Product Overview & Core Advantages
The 7040 ACDGB/P4A is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. As a universal matchable bearing with a P4A tolerance class, it delivers superior running accuracy and is supplied pre-lubricated for immediate use. Its 25° contact angle and light preload (Class B) are optimized to handle combined loads—significant radial and axial loads simultaneously—making it ideal for high-speed, high-rigidity spindle configurations.
7040 ACDGB/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| AC | Angular Contact design with a 25° contact angle. |
| DGB | Universal Matchable (SU designation). Bearings are manufactured to universal standards allowing any bearing to be mounted with any other in a set without loss of preload. |
| P4A | High precision tolerance class exceeding ABEC 7 standards, ensuring extremely tight running accuracy for critical applications. |
7040 ACDGB/P4A Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The angular contact design and light preload provide high system rigidity, enabling the bearing to effectively support combined radial and axial loads.
- Precision Performance: Manufactured to a P4A tolerance class with a phenolic cage, this bearing ensures minimal vibration and high rotational accuracy, which is critical for precision machinery.
- Optimized for High-Speed Operation: The lightweight phenolic cage and optimized internal geometry contribute to a high limiting speed of 16,250 rpm, making it suitable for high-speed spindle applications.
- Universal Matching & Simplified Assembly: The Universal Matchable (SU) feature allows for simplified mounting in sets of 2, 3, or 4 bearings without the need for selective assembly, reducing installation time and complexity.
- Durable Construction: Manufactured from chrome steel for both rings and balls, ensuring high durability and long service life under demanding conditions.
7040 ACDGB/P4A Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: Applications in PCB drilling, precision grinding, and other high-accuracy machining.
- High-Frequency Motors: Spindles for high-speed electric motors and frequency converters.
- Industrial Pumps & Compressors: Where high precision and reliability are required.
