7008 CD/P4ADBD
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7008 CD/P4ADBD
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
Heavy / Class D
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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7008 CD/P4ADBD Bearing Product Overview & Core Advantages
The 7008 CD/P4ADBD is a precision duplex angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This matched back-to-back (DB) arrangement features a heavy preload (Class D), providing superior system stiffness and minimizing axial and radial deflection under complex combined loads. Manufactured to P4A tolerance class, it ensures high running accuracy, making it ideal for high-speed, high-precision spindles and machinery where positional stability is critical.
7008 CD/P4ADBD Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7008 | Basic bearing series, defining the core dimensions: 40mm bore, 68mm OD, 30mm width. |
| C | 15° contact angle, optimized for carrying significant axial loads. |
| D | Indicates a heavy preload (Class D) for maximum system rigidity. |
| /P4A | Specifies a high-precision tolerance class (P4A) for exceptional running accuracy. |
| DB | Denotes the duplex back-to-back (DB) matched arrangement, which increases moment stiffness. |
7008 CD/P4ADBD Bearing Structural Features & Performance Benefits
- High Rigidity & Preload: The back-to-back duplex configuration with a heavy preload creates an exceptionally stiff bearing system that effectively resists moment loads and minimizes operational deflection, crucial for maintaining precision under heavy combined loads.
- Superior Load Capacity: The 15° contact angle and robust construction enable the bearing to handle high radial loads and substantial bidirectional axial loads simultaneously.
- Precision & High-Speed Performance: Manufactured to P4A dimensional and running accuracy standards with a lightweight phenolic cage, this bearing supports a high limiting speed of 41,000 rpm while ensuring smooth, low-vibration operation.
- Optimized Material Selection: Components made from chrome steel provide high hardness and durability, while the phenolic cage offers strength and reduced friction at high speeds.
7008 CD/P4ADBD Bearing Typical Application Areas
This bearing is engineered for high-performance applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Gearboxes: Where high rigidity and accurate shaft positioning are required.
- High-Frequency Motors and Spindles: Applications demanding minimal runout and high rotational accuracy.
- Industrial Pumps and Compressors: For robust performance under significant axial and radial forces.
