7008 CE/P4ALDT
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7008 CE/P4ALDT
Basic Information
System of measurement
Metric
Weight
0.37 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
7.144 mm
Ball quantity
19
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
4478 lbf
Radial static load rating
3442 lbf
Limiting speed
56 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Duplex Tandem (DT)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
Preload
Available
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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7008 CE/P4ALDT Bearing Product Overview & Core Advantages
The 7008 CE/P4ALDT is a precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. This duplex tandem (DT) arrangement bearing set is preloaded and manufactured to P4A tolerance class, ensuring ultra-high running accuracy and system rigidity. Its primary advantage lies in its ability to handle significant combined loads (radial and axial) in one direction with maximum stiffness, making it ideal for high-precision spindles and other critical machinery components where minimal deflection is paramount.
7008 CE/P4ALDT Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7008 | Basic bearing series and size designation (40mm bore, 68mm OD, 30mm width). |
| C | 15° contact angle, optimized for high axial load capacity. |
| E | Reinforced (or optimized) internal design for increased load rating. |
| P4A | Ultra-high precision tolerance class, exceeding ABEC 7/ISO P4 standards for superior running accuracy. |
| L | Light preload applied to the matched set. |
| DT | Duplex Tandem arrangement. Two bearings are mounted together to share axial loads in the same direction, maximizing axial rigidity. |
7008 CE/P4ALDT Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex tandem arrangement and preload create an exceptionally stiff bearing system capable of withstanding heavy combined loads with minimal axial and radial deflection.
- Precision Performance: Manufactured to P4A tolerance class with a 15° contact angle, this bearing ensures ultra-smooth operation, low noise, and minimal runout, which is critical for high-speed, high-accuracy applications.
- Optimized Internal Design: The "E" designation indicates an optimized internal geometry, including a phenolic cage and 19 precision balls, contributing to a high limiting speed of 56,000 rpm and excellent dynamic performance.
- Material Integrity: Constructed from chrome steel for both rings and balls, ensuring high durability, wear resistance, and a long operational lifespan under demanding conditions.
7008 CE/P4ALDT Bearing Typical Application Areas
This bearing is specifically engineered for high-performance machinery where precision, speed, and rigidity are non-negotiable. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling, engraving machines, and other high-precision automated equipment.
- High-Frequency Motors: Spindles for electric motors requiring ultra-high rotational accuracy.
- Medical & Laboratory Equipment: Centrifuges and other precision instruments.
