7008 CD/P4ADBB
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7008 CD/P4ADBB
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
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
Price:
$ 132.82
/ each
In Stock
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7008 CD/P4ADBB Bearing Product Overview & Core Advantages
The 7008 CD/P4ADBB is a precision duplex angular contact ball bearing set, specifically engineered for applications demanding exceptional rotational accuracy and high rigidity. This matched back-to-back (DB) arrangement is preloaded to Light / Class B standards, ensuring optimal stiffness and minimal axial/radial runout. Its design excels at handling combined loads (simultaneous radial and axial forces) and is optimized for high-speed operation, making it an ideal choice for high-performance spindles and precision machinery where reliability is critical.
7008 CD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7008 | Basic bearing series, indicating a 40mm bore, 68mm OD, and 30mm width. |
| C | Designates a 15° contact angle, optimized for high-speed performance and moderate axial load capacity. |
| D | Indicates the bearing is part of a duplex (paired) set. |
| P4A | Specifies a high-precision tolerance class (superior to ABEC 7), ensuring extremely tight dimensional and running accuracy. |
| DB | Defines the Back-to-Back mounting arrangement, which provides high moment rigidity and excellent stability under complex loads. |
| B | Indicates the Light preload level, which minimizes deflection and controls axial/radial play for precise operation. |
7008 CD/P4ADBB Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The duplex back-to-back (DB) arrangement creates a wide, stable support system that significantly increases moment stiffness, making it resistant to tilting moments and complex combined loads.
- Optimized for High Speeds: The 15° contact angle and lightweight phenolic resin cage reduce centrifugal forces and friction, enabling a high limiting speed of 41,000 rpm. The open design facilitates efficient lubrication and heat dissipation.
- Superior Precision: Manufactured to P4A tolerance class with extremely tight bore, OD, and width tolerances, this bearing ensures minimal runout and vibration for ultra-precise applications.
- Robust Load Capacity: Constructed from chrome steel for both rings and balls, the bearing offers a high dynamic load rating (6210 lbf), providing long service life under demanding conditions.
- Pre-Configured Performance: The set is supplied as a matched pair with a defined light preload, eliminating the need for complex on-site adjustment and guaranteeing consistent, high-performance operation from installation.
7008 CD/P4ADBB Bearing Typical Application Areas
This precision bearing set is ideally suited for high-performance machinery requiring exceptional accuracy and speed, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles: Applications where minimal runout is critical.
- High-Frequency Motors and Spindles: Used in PCB drilling and precision engraving.
- Industrial Pumps and Compressors: For shafts requiring rigid, precise support.
- Medical and Laboratory Equipment: Centrifuges and other high-speed precision instruments.
