7008 CD/P4AQBTC
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7008 CD/P4AQBTC
Basic Information
System of measurement
Metric
Weight
0.77 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
60 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
9945 lbf
Radial static load rating
9900 lbf
Limiting speed
43 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Quadruplex Tandem Back-to-Back (QBT)
Number of bearings in matched set
4
Universal matching bearing
No (Standard)
Preload
Moderate / Class C
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 CD/P4AQBTC Bearing Product Overview & Core Advantages
The 7008 CD/P4AQBTC is a precision quadruplex matched bearing set designed for demanding applications requiring exceptional rigidity and accuracy. This metric angular contact ball bearing features a Moderate (Class C) preload and is arranged in a Quadruplex Tandem Back-to-Back (QBT) configuration. This specific arrangement is engineered to handle combined loads with superior axial rigidity, making it ideal for high-precision, high-stiffness systems where minimal deflection under load is critical. The set is pre-lubricated and adheres to the stringent P4A tolerance class, ensuring consistent, high-performance operation.
7008 CD/P4AQBTC Bearing Model Code Explained, Specifications & Naming Convention
The model number 7008 CD/P4AQBTC provides detailed technical specifications:
- 7008: Basic bearing designation (40mm bore, 68mm OD, 60mm width).
- C: Denotes a 15° contact angle, optimized for high-speed operation and axial load capacity.
- D: Indicates the bearing is part of a matched set.
- P4A: Specifies the tolerance class, indicating very high precision with enhanced dimensional and running accuracy requirements.
- QBT: Defines the matched arrangement as Quadruplex Tandem Back-to-Back, a configuration of four bearings designed to support heavy axial loads in both directions with maximum rigidity.
7008 CD/P4AQBTC Bearing Structural Features & Performance Benefits
- Exceptional Rigidity and Load Capacity: The Quadruplex Tandem Back-to-Back (QBT) arrangement of four bearings creates an extremely rigid system capable of withstanding significant combined radial and axial loads. This is essential for applications where shaft displacement must be minimized.
- High-Speed Capability: The 15° contact angle and lightweight phenolic cage contribute to lower friction and heat generation, enabling a high limiting speed of 43,000 rpm. This makes it suitable for high-speed spindles.
- Precision Performance: Manufactured to P4A tolerance class, this bearing set guarantees ultra-precise running accuracy and dimensional stability, which is critical for applications requiring high positional accuracy.
- Optimized Material Selection: The use of chrome steel for both rings and balls ensures high durability and fatigue resistance, providing a long operational life under heavy loads.
7008 CD/P4AQBTC Bearing Typical Application Areas
This high-precision, high-rigidity bearing set is typically employed in:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Rotary Tables and Indexing Heads.
- High-Frequency Spindles for PCB drilling and routing.
- Medical Equipment such as high-speed dental handpieces and imaging scanners.
- Aerospace Actuation Systems and other applications demanding extreme accuracy and stiffness.
