7040 CD/P4ADBA
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7040 CD/P4ADBA
Basic Information
System of measurement
Metric
Weight
24.6 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
102 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
34.925 mm
Ball quantity
21
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
109800 lbf
Radial static load rating
172125 lbf
Limiting speed
16.25 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
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
Price available upon request.
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7040 CD/P4ADBA Bearing Product Overview & Core Advantages
The 7040 CD/P4ADBA is a precision duplex angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. This P4A tolerance class bearing features a back-to-back (DB) matched arrangement, providing superior stability and the ability to withstand combined radial and axial loads. With its extra light preload (Class A), it is engineered for high-speed operation up to 16,250 rpm, making it an ideal solution for high-precision spindles and other critical machinery components where high rigidity and minimal runout are paramount.
7040 CD/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
The model number 7040 CD/P4ADBA provides detailed technical specifications:
- 7040: Basic bearing series designation, indicating the size and type.
- C: 15° contact angle, optimized for high-speed applications with combined loads.
- D: Indicates the bearing is part of a duplex (matched pair) set.
- P4A: Denotes an ultra-precision tolerance class superior to ABEC 7, ensuring extremely tight dimensional and running accuracy.
- DB: Specifies the back-to-back mounting arrangement of the duplex pair, which increases moment rigidity and operational stability.
- A: Signifies an Extra Light Preload applied to the matched set, reducing vibration and maximizing high-speed performance.
7040 CD/P4ADBA Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The duplex back-to-back (DB) design creates a wide, rigid support system that effectively resists moment loads and shaft deflection, ensuring precise shaft positioning.
- Superior Load Capacity: Engineered with a 15° contact angle and high-grade chrome steel components, this bearing is capable of handling significant combined radial and axial loads simultaneously.
- High-Speed Performance: The combination of an extra light preload, a lightweight phenolic resin cage, and precision grinding allows for a high limiting speed of 16,250 rpm.
- Precision Operation: Manufactured to P4A tolerance class standards, this bearing guarantees minimal runout and vibration, which is critical for applications requiring extreme accuracy.
- Optimized Material Selection: The use of chrome steel for rings and balls, along with a durable phenolic cage, ensures long service life and reliable performance under demanding conditions.
7040 CD/P4ADBA Bearing Typical Application Areas
This bearing is specifically designed for high-performance applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles: Applications requiring the highest levels of accuracy and surface finish.
- High-Frequency Motors and High-Speed Pumps.
- Aerospace and Defense positioning systems and instrumentation.
- Other industrial machinery where high rigidity, high speed, and precision are non-negotiable.
