7008 CD/P4ATBTB
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7008 CD/P4ATBTB
Basic Information
System of measurement
Metric
Weight
0.58 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
45 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
8190 lbf
Radial static load rating
7312 lbf
Limiting speed
43 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Triplex Back-to-Back (TBT)
Number of bearings in matched set
3
Universal matching bearing
No (Standard)
Preload
Light / Class B
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/P4ATBTB Bearing Product Overview & Core Advantages
The 7008 CD/P4ATBTB is a high-precision angular contact ball bearing configured in a triplex back-to-back (TBT) matched set. This arrangement is engineered to deliver exceptional system rigidity and handle combined loads (radial and axial) simultaneously. Manufactured to a P4A tolerance class and featuring a light preload (Class B), it is designed for applications demanding the highest levels of rotational accuracy, high-speed capability, and operational reliability in demanding conditions.
7008 CD/P4ATBTB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7008 | Basic bearing series and size designation (40mm bore, 68mm OD). |
| CD | Indicates a specific internal design and contact angle (15° in this case). |
| P4A | Denotes a high-precision tolerance class with enhanced running accuracy requirements. |
| TBT | Signifies the bearing is supplied as a Triplex Back-to-Back matched set of three bearings. |
7008 CD/P4ATBTB Bearing Structural Features & Performance Benefits
- Exceptional Rigidity and Load Capacity: The triplex back-to-back arrangement creates a highly rigid bearing system capable of supporting significant combined radial and axial loads from both directions, making it ideal for applications with complex loading conditions.
- High-Speed Performance: The phenolic cage is lightweight and robust, contributing to lower centrifugal forces and stable operation at high rotational speeds. The optimized internal geometry further enhances high-speed capability.
- Precision Operation: The P4A tolerance class ensures minimal runout and precise shaft positioning, which is critical for applications requiring high rotational accuracy.
- Optimized Preload: The factory-set light preload (Class B) eliminates internal clearance, increases system stiffness, and ensures precise rotational performance without requiring user adjustment.
- Durable Construction: Manufactured from chrome steel for both rings and balls, this bearing offers high load capacity and long service life.
7008 CD/P4ATBTB Bearing Typical Application Areas
This precision bearing set is specifically designed for high-performance machinery, including:
- Machine Tool Spindles (High-speed machining centers, grinding spindles)
- Precision Gearboxes
- High-Frequency Motors
- Industrial Pumps and Compressors
- Aerospace and Defense Actuation Systems
