7205 ACDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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7205 ACDGA/HCP4A Bearing Product Overview & Core Advantages
The 7205 ACDGA/HCP4A is a single-row angular contact ball bearing engineered for ultra-high precision applications requiring exceptional speed capabilities and rigid rotational accuracy. Manufactured to ABEC 7/P4A tolerance class, this bearing delivers superior running accuracy and dimensional stability. Its ceramic balls and optimized 25° contact angle enable outstanding performance under combined radial and axial loads while significantly reducing centrifugal forces at high rotational speeds. The phenolic cage ensures quiet operation and excellent dimensional stability across its operating temperature range.
Model Code Breakdown
| Code Segment | Technical Meaning | Performance Benefit |
|---|---|---|
| 7205 | Standard bearing series designation with 25mm bore diameter | Industry-standard sizing for compatibility |
| AC | Angular Contact design | Optimized for combined radial and axial loads |
| DGA | Universal Matchable bearing (SU designation) | Enables precise preload control in paired arrangements |
| HC | Hybrid Ceramic (Silicon Nitride balls) | Reduced weight, lower friction, and extended service life |
| P4A | ABEC 7/P4A super precision tolerance class | Exceptional running accuracy and dimensional stability |
7205 ACDGA/HCP4A Bearing Structural Features & Performance Benefits
Hybrid Ceramic Construction: The combination of chrome steel rings with silicon nitride ceramic balls provides superior performance characteristics including reduced friction, higher stiffness, and electrical insulation properties. This hybrid design significantly extends bearing life in high-speed applications.
Precision Engineering: Manufactured to P4A tolerance class with bore and outside diameter tolerances of -0.004mm to 0, ensuring exceptional dimensional accuracy and consistent performance in precision applications.
High-Speed Capability: The phenolic cage and ceramic balls enable operation at limiting speeds up to 100,500 rpm, making this bearing ideal for high-speed spindle applications where centrifugal forces are a critical factor.
Optimized Load Capacity: With a 25° contact angle and 13 ceramic balls of 7.938mm diameter, this bearing achieves excellent balance between radial and axial load carrying capacity, rated at 2925 lbf dynamic and 1564 lbf static loads.
Thermal Stability: The phenolic cage maintains dimensional stability across the operating temperature range of -30°C to 110°C, ensuring consistent performance in varying thermal conditions.
7205 ACDGA/HCP4A Bearing Typical Application Areas
Machine Tool Spindles: High-speed machining centers, CNC milling machines, and precision grinding spindles requiring exceptional rotational accuracy and rigidity.
High-Speed Motors: Electric motor applications where ceramic hybrid technology reduces electrical erosion and extends service life.
Precision Instrumentation: Medical equipment, optical instruments, and measuring devices demanding ultra-precise rotational characteristics.
Aerospace Components: Guidance systems, gyroscopes, and other critical aerospace applications requiring reliability at extreme speeds.
Robotics and Automation: High-precision robotic joints and automation equipment where accuracy, speed, and longevity are paramount.
