71804 ACD/P4TGB
71800 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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71804 ACD/P4TGB Bearing Product Overview & Core Advantages
The 71804 ACD/P4TGB is a super-precision angular contact ball bearing designed for applications demanding the highest levels of rotational accuracy and rigidity. As a universally matchable (SU) bearing supplied in a set of three, it enables the creation of optimized, preloaded bearing arrangements that deliver exceptional performance. Its core advantages include outstanding high-speed capability, the ability to handle combined loads (radial and axial), and superior running accuracy due to its P4 tolerance class. This makes it an ideal, compact solution for high-reliability spindles and precision machinery.
71804 ACD/P4TGB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 71804 | Basic bearing series and size designation (20mm bore, 32mm OD, 21mm width). | Defines the core bearing dimensions. |
| AC | Angular Contact design with a 25° contact angle. | Optimized for carrying combined loads. |
| D | The bearing is supplied as part of a universally matchable (SU) set. | Allows flexible mounting in tandem or back-to-back arrangements to achieve a defined preload. |
| P4 | Tolerance class equivalent to ISO Class 4 / ABEC 7. | Indicates super-precision manufacturing for minimal runout and vibration. |
| TGB | Grease lubrication with a phenolic (resin) cage. | The lightweight phenolic cage contributes to high-speed performance and low friction. |
71804 ACD/P4TGB Bearing Structural Features & Performance Benefits
High Rigidity and Load Capacity: The angular contact design with a 25° contact angle and the ability to be mounted in preloaded sets provides a very rigid bearing system, capable of supporting significant combined radial and axial loads.
Super-Precision High-Speed Performance: The combination of a P4 tolerance class and a lightweight phenolic cage minimizes vibration and inertial forces, enabling a high limiting speed of 121,000 rpm. This makes it a premier choice for high-speed spindle applications.
Optimized for Matched Arrangements: As a universally matchable (SU) bearing supplied in a set, it ensures consistent performance and simplifies the assembly of complex, high-precision bearing systems with a defined preload (Light / Class B in this case).
Material and Lubrication: Constructed from high-grade chrome steel for both rings and balls, ensuring durability and long service life. The bearing is pre-lubricated for immediate operation.
71804 ACD/P4TGB Bearing Typical Application Areas
The 71804 ACD/P4TGB is engineered for the most demanding precision applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling, semiconductor manufacturing equipment.
- High-Frequency Motors: Spindles for routers and other high-RPM machinery.
- Robotics: High-accuracy joints and rotary actuators.
