7008 ACD/P4AQBTA
7000 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
7008 ACD/P4AQBTA
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
25 °
Ball & Washer Dimensions
Ball diameter
7.938 mm
Ball quantity
18
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
9518 lbf
Radial static load rating
9338 lbf
Limiting speed
56 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
Extra light / Class A
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 ACD/P4AQBTA Bearing Product Overview & Core Advantages
The 7008 ACD/P4AQBTA is a super-precision angular contact ball bearing designed for the most demanding applications. This quadruplex matched set in a Tandem Back-to-Back (QBT) arrangement delivers exceptional system rigidity and axial load capacity. Manufactured to P4A tolerance class, it offers superior running accuracy, making it ideal for high-speed spindles requiring maximum precision and high rigidity under complex combined loads.
7008 ACD/P4AQBTA Bearing Model Code Explained, Specifications & Naming Convention
The model number 7008 ACD/P4AQBTA provides detailed technical specifications:
- 7008: Basic bearing series with 40mm bore, 68mm OD.
- ACD: 25° contact angle, optimized for high axial load capacity.
- P4A: High-precision tolerance class exceeding ABEC 7, ensuring minimal runout and vibration.
- QB: Denotes a quadruplex (4-bearing) matched set.
- T: Tandem Back-to-Back (QBT) mounting arrangement for maximum axial stiffness.
- A: Extra light preload for optimal performance in high-speed applications.
7008 ACD/P4AQBTA Bearing Structural Features & Performance Benefits
- Unmatched Rigidity & Load Capacity: The quadruplex QBT arrangement creates an extremely rigid bearing system capable of handling heavy combined loads (radial and axial) from multiple directions, crucial for maintaining machining accuracy.
- Super-Precision Performance: The P4A tolerance class and 25° contact angle ensure ultra-smooth operation with minimal runout, enabling high rotational accuracy and superior surface finishes.
- High-Speed Capability: The lightweight phenolic cage and optimized internal geometry contribute to lower centrifugal forces, supporting a limiting speed of 56,000 rpm. The extra light preload (Class A) minimizes friction and heat generation at high speeds.
- Durability & Reliability: Manufactured from high-grade chrome steel for both rings and balls, this bearing ensures long service life and consistent performance under demanding conditions.
7008 ACD/P4AQBTA Bearing Typical Application Areas
This bearing is specifically engineered for high-performance machinery where precision and rigidity are paramount. Key applications include:
- High-Speed Machine Tool Spindles (CNC milling, grinding, and jig boring machines)
- Precision Grinding Spindles
- High-Frequency Machining Centers
- Other advanced industrial equipment requiring super-precision and high rigidity.
