706 CD/P4AQBTB
Miniature Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
706 CD/P4AQBTB
Basic Information
System of measurement
Metric
Weight
0.024 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
6 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
17 mm
Outside diameter tolerance
-0.004mm to 0
Width
24 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
3.175 mm
Ball quantity
8
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
1186 lbf
Radial static load rating
686 lbf
Limiting speed
140 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
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In Stock
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706 CD/P4AQBTB Bearing Product Overview & Core Advantages
The 706 CD/P4AQBTB is a metric precision angular contact ball bearing supplied as a Quadruplex Tandem Back-to-Back (QBT) matched set. This configuration is engineered to deliver exceptional axial rigidity and handle significant combined loads. Manufactured to P4A tolerance class with a Light (Class B) preload, it is optimized for applications demanding high rotational accuracy, smooth operation, and superior performance in high-speed spindle arrangements.
706 CD/P4AQBTB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 706 CD | Basic bearing designation indicating size and contact angle (15°). |
| P4A | Denotes a high-precision tolerance class, ensuring minimal dimensional and running inaccuracies. |
| QBT | Specifies the Quadruplex Tandem Back-to-Back arrangement. This is a set of four bearings matched for optimal performance. |
706 CD/P4AQBTB Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The QBT matched set creates an extremely stiff bearing system capable of supporting heavy combined radial and axial loads from both directions. The back-to-back arrangement provides high moment stiffness.
- High-Speed Performance: The lightweight phenolic resin cage and optimized internal geometry contribute to a high limiting speed of 140,000 rpm, making it suitable for high-speed spindle applications.
- Precision Operation: The P4A tolerance class and controlled preload ensure minimal runout and vibration, which is critical for achieving superior surface finishes and machining accuracy.
- Open Design & Pre-Lubrication: The open seal type allows for efficient custom lubrication systems, while the bearing comes pre-lubricated for immediate initial operation.
706 CD/P4AQBTB Bearing Typical Application Areas
This precision bearing set is ideally suited for high-performance machinery requiring maximum rigidity and speed, including:
- High-Frequency Machine Tool Spindles
- Precision Grinding Spindles
- High-Speed Machining Centers
- Other precision rotary equipment where a quadruplex bearing arrangement is specified for ultimate performance.
