71906 ACDGA/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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71906 ACDGA/P4A Bearing Product Overview & Core Advantages
The 71906 ACDGA/P4A is a single-row angular contact ball bearing designed for applications demanding high precision and superior rotational accuracy. Operating under the stringent P4A tolerance class, it delivers exceptional dimensional stability and running accuracy. Its 25° contact angle is optimized to support significant combined loads, efficiently handling both radial and axial forces. The bearing is pre-lubricated and features an open design, making it a universally matchable (SU) component ideal for creating precisely preloaded duplex arrangements in high-speed spindle systems and other precision machinery.
71906 ACDGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71906 | Basic bearing series and size designation (30mm bore, 47mm OD, 9mm width). |
| AC | Angular Contact design with a 25° contact angle. |
| D | Indicates a Universal Matchable (SU) bearing, designed to be paired with another identical bearing to form a preloaded set. |
| GA | Specifies an Extra Light (Class A) preload level. |
| P4A | Denotes an ultra-high precision tolerance class, exceeding ABEC 7 standards, for applications requiring minimal runout and extreme accuracy. |
71906 ACDGA/P4A Bearing Structural Features & Performance Benefits
High Precision & Rigidity: Manufactured to P4A tolerance standards with extremely tight dimensional tolerances on the bore, outside diameter, and width. This ensures superior shaft positioning accuracy and system rigidity. The phenolic resin cage offers excellent dimensional stability and is ideal for high-speed operation.
Optimized Load Capacity: The 25° contact angle provides an excellent balance, enabling the bearing to support substantial combined radial and axial loads simultaneously. With a dynamic load rating of 1521 lbf and a static load rating of 968 lbf, it is built for demanding performance.
Superior High-Speed Performance: The lightweight phenolic cage and optimized internal geometry, including 20 precision balls of 4.762 mm diameter, contribute to a very high limiting speed of 100,500 rpm. The open design facilitates efficient lubrication management in high-speed systems.
Universal Matching Capability (SU): This bearing is supplied as a universally matchable single unit. Two bearings can be paired in a duplex set (e.g., back-to-back or face-to-face) to create a preloaded arrangement that significantly increases system stiffness and rotational accuracy without selective mounting.
71906 ACDGA/P4A Bearing Typical Application Areas
The 71906 ACDGA/P4A is engineered for the most demanding precision applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy rotary axes.
- High-Frequency Motors and Spindles: Where minimal runout and high rigidity are critical.
- Medical and Dental Equipment: High-speed handpieces and scanners.
- Aerospace Instrumentation: Gyroscopes and other precision navigation systems.
