7208 ACD/P4A
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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7208 ACD/P4A Bearing Product Overview & Core Advantages
The 7208 ACD/P4A is a single-row angular contact ball bearing designed for applications requiring exceptional precision and high-speed performance. Engineered to P4 (ABEC-7) tolerance class, this bearing delivers superior running accuracy and rotational stability. Its key advantage lies in its ability to accommodate combined loads—handling significant radial loads alongside substantial axial loads in one direction. The optimized 25° contact angle provides excellent axial load capacity while maintaining high-speed capability. Preloaded and ready for installation, it offers high rigidity and precise axial positioning, making it ideal for demanding, high-precision machinery where reliability and accuracy are paramount.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 7208 | Basic bearing series: Light series, 40mm bore, 80mm OD |
| AC | Angular Contact design with 25° contact angle |
| D | Enhanced internal design for higher load capacity |
| P4A | Precision class P4 (ABEC-7) with specific axial runout tolerance |
7208 ACD/P4A Bearing Structural Features & Performance Benefits
High-Precision Construction: Manufactured to P4 tolerance class with bore diameter tolerance of -0.006mm to 0 and outside diameter tolerance of -0.007mm to 0, ensuring exceptional dimensional accuracy and running precision.
Optimized Load Capacity: The 25° contact angle and enhanced internal geometry enable superior combined load handling with a radial dynamic load rating of 7178 lbf and radial static load rating of 5130 lbf.
High-Speed Performance: The phenolic cage provides excellent strength-to-weight ratio, contributing to the high limiting speed of 26,000 rpm while reducing centrifugal forces.
Premium Material Selection: Chrome steel rings and balls deliver high hardness, wear resistance, and dimensional stability under varying operating temperatures (-30° to 110°C).
Preload Configuration: Factory-set preload ensures immediate high rigidity and minimal axial play, eliminating the need for initial adjustment and providing consistent performance.
7208 ACD/P4A Bearing Typical Application Areas
Machine Tool Spindles: High-precision machining centers, grinding spindles, and CNC milling machines requiring exceptional accuracy and rigidity.
High-Speed Motors & Spindles: Electric motor applications, high-frequency spindles, and precision drives where speed and reliability are critical.
Precision Instrumentation: Measuring equipment, optical instruments, and laboratory apparatus demanding minimal vibration and high positional accuracy.
Robotics & Automation: Industrial robots, automated guided vehicles, and precision positioning systems requiring high rigidity and responsive performance.
Aerospace Components: Auxiliary systems, instrumentation, and control mechanisms where precision and reliability under varying conditions are essential.
