7008 CD/P4ADBC
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7008 CD/P4ADBC
Basic Information
System of measurement
Metric
Weight
0.38 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
40 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
68 mm
Outside diameter tolerance
-0.004mm to 0
Width
30 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
7.938 mm
Ball quantity
18
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
6210 lbf
Radial static load rating
4950 lbf
Limiting speed
41 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
Moderate / Class C
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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In Stock
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7008 CD/P4ADBC Bearing Product Overview & Core Advantages
The 7008 CD/P4ADBC is a precision duplex angular contact ball bearing designed for applications requiring exceptional rotational accuracy and rigidity. This matched back-to-back (DB) arrangement is preloaded to Moderate Class C standards, providing superior system stiffness and minimizing axial and radial runout. Its primary advantage lies in its ability to handle combined loads (radial and axial) simultaneously while maintaining high performance in demanding, high-speed environments. Manufactured to the stringent P4A tolerance class, it is an ideal choice for high-precision machinery where reliability and accuracy are paramount.
7008 CD/P4ADBC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7008 | Basic bearing series and size designation (40mm bore, 68mm OD). |
| C | Specifies a 15° contact angle, optimized for high-speed operation and moderate axial load capacity. |
| D | Indicates the bearing is part of a duplex (matched pair) set. |
| P4A | Denotes a very high precision tolerance class, exceeding ABEC 7 standards, for applications requiring extreme running accuracy. |
| DB | Specifies the Back-to-Back mounting arrangement, which provides high moment rigidity and is tolerant of misalignment. |
| C (in Preload) | Indicates a Moderate preload class, which increases system stiffness and improves positional accuracy without excessive heat generation. |
7008 CD/P4ADBC Bearing Structural Features & Performance Benefits
- High Rigidity & System Stiffness: The duplex back-to-back (DB) design and moderate preload create an exceptionally rigid bearing system. This configuration effectively resists moment loads and shaft deflection, ensuring precise positioning and stable operation under heavy combined loads.
- Superior Precision & Speed: Manufactured to P4A tolerance class with a 15° contact angle and a lightweight phenolic cage, this bearing is engineered for high-speed applications, achieving a limiting speed of 41,000 rpm. The precision grinding of components ensures smooth, quiet, and low-vibration operation.
- Optimized Load Capacity: The angular contact design enables the bearing to support significant radial loads and axial loads in one direction. The duplex DB arrangement allows for the management of bidirectional axial loads and increases overall load-carrying capacity.
- Durability and Reliability: Constructed from high-grade chrome steel for both rings and balls, the bearing offers excellent wear resistance and long service life. The open seal type allows for optimal lubrication management in controlled environments.
7008 CD/P4ADBC Bearing Typical Application Areas
This precision duplex bearing is specifically designed for high-performance machinery, including:
- Machine Tool Spindles: For CNC machining centers, grinding spindles, and high-speed milling heads requiring extreme accuracy and rigidity.
- High-Speed Motors and Spindles: Used in electric motors, frequency converter drives, and other applications where high rotational speeds are critical.
- Precision Instrumentation: Ideal for medical devices, optical scanners, and measuring equipment that demand minimal runout and high positional accuracy.
- Robotics and Automation: Provides the necessary stiffness and precision for robotic arm joints, rotary tables, and other automated positioning systems.
