7208 ACD/P4AQBTB
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
7208 ACD/P4AQBTB
Basic Information
System of measurement
Metric
Weight
1.49 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
80 mm
Outside diameter tolerance
-0.004mm to 0
Width
72 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
11.112 mm
Ball quantity
14
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
19170 lbf
Radial static load rating
20588 lbf
Limiting speed
41 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
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
In Stock
Price available upon request.
Our sales team will respond within 24 hours with a competitive quote tailored to your requirements.
REQUEST A QUOTE
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
7208 ACD/P4AQBTB Bearing Product Overview & Core Advantages
The 7208 ACD/P4AQBTB is a precision angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This quadruplex matched set features a tandem back-to-back (QBT) arrangement, enabling it to handle significant combined loads (radial and axial) simultaneously. Manufactured to P4A tolerance class with a light preload (Class B), it delivers superior running accuracy, high-speed capability, and outstanding operational stability, making it ideal for high-precision, high-rigidity spindle systems.
7208 ACD/P4AQBTB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7208 | Basic bearing series, indicating a 40 mm bore, 80 mm OD, and 72 mm width. |
| ACD | Angular Contact design with a 25° contact angle. |
| P4A | High precision tolerance class (superior to ABEC 7), ensuring minimal runout and vibration. |
| QBTB | Quadruplex Tandem Back-to-Back matched arrangement. Four bearings are pre-matched for optimal load sharing and stiffness. |
7208 ACD/P4AQBTB Bearing Structural Features & Performance Benefits
- Exceptional Rigidity and Load Capacity: The quadruplex back-to-back arrangement creates a highly rigid bearing system capable of withstanding heavy combined radial and axial loads from multiple directions, minimizing shaft deflection under load.
- High-Speed Performance: The phenolic resin cage is lightweight and robust, reducing centrifugal forces and allowing for a high limiting speed of 41,000 rpm. The optimized internal geometry further enhances high-speed stability.
- Precision Engineering: Manufactured to P4A tolerance class with extremely tight dimensional tolerances on the bore, outside diameter, and width. This guarantees precise shaft positioning, smooth operation, and reduced vibration.
- Optimized Material Selection: Constructed from chrome steel for both rings and balls, providing high hardness, wear resistance, and long service life under demanding conditions.
7208 ACD/P4AQBTB Bearing Typical Application Areas
This bearing is engineered for high-performance machinery where maximum rigidity and precision are paramount. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling machines, precision grinding equipment.
- High-Frequency Motors: Spindles for routers and other high-RPM applications.
- Robotic Drives: High-accuracy joints and rotary axes.
