7204 ACD/P4ADBC
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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7204 ACD/P4ADBC Bearing Product Overview & Core Advantages
The 7204 ACD/P4ADBC is a precision duplex angular contact ball bearing designed for applications requiring exceptional rotational accuracy and rigidity. This back-to-back (DB) matched pair is preloaded to Moderate / Class C standards, ensuring optimal stiffness and minimal axial/radial runout. Its primary advantage lies in its ability to handle combined loads—significant radial loads alongside substantial axial loads in both directions—making it ideal for high-precision, high-rigidity systems. Manufactured to P4A tolerance class, it guarantees superior dimensional and running accuracy for demanding applications.
7204 ACD/P4ADBC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7204 | Basic bearing series, indicating a 20mm bore, 47mm OD, and 28mm width. |
| AC | Angular Contact design with a 25° contact angle. |
| D | Duplex (Two bearings supplied as a matched set). |
| P4A | High-Precision Tolerance Class, exceeding ABEC 7/ISO P4 standards, ensuring ultra-precise running accuracy. |
| DB | Back-to-Back mounting arrangement, providing high moment rigidity. |
| C | Moderate preload level, optimized for general high-speed and high-rigidity applications. |
7204 ACD/P4ADBC Bearing Structural Features & Performance Benefits
Optimized Rigidity and Load Capacity: The duplex back-to-back (DB) configuration creates a wide, rigid support system that effectively resists moment loads. This setup, combined with the 25° contact angle, provides excellent capability for handling combined radial and bidirectional axial loads.
High-Speed Performance: The lightweight phenolic resin cage minimizes centrifugal forces and ensures stable operation at the high limiting speed of 100,500 rpm. The bearings are pre-lubricated for immediate operation.
Precision Engineering: Manufactured from high-grade chrome steel for both rings and balls, and held to P4A super-precision tolerances, this bearing delivers exceptional running accuracy, low noise, and low vibration levels.
Thermal Stability: The phenolic cage and specified lubricant allow for a reliable operating temperature range of -30°C to 110°C.
7204 ACD/P4ADBC Bearing Typical Application Areas
The 7204 ACD/P4ADBC is engineered for high-performance machinery where precision, speed, and rigidity are critical. Key applications include:
- Machine Tool Spindles: For CNC machining centers, grinding spindles, and high-speed milling heads.
- Precision Rotary Systems: In industrial robots, indexing tables, and rotary actuators.
- High-Frequency Motors and Spindles: Used in PCB drilling spindles and dental handpieces.
- Advanced Pump and Compressor Systems: Where precise shaft positioning and high-speed operation are required.
