7208 ACD/P4ATBTC
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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7208 ACD/P4ATBTC Bearing Product Overview & Core Advantages
The 7208 ACD/P4ATBTC is a precision angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This triplex matched set, arranged in a Back-to-Back (TBT) configuration, is engineered to handle combined loads (significant radial and axial loads) simultaneously. With a P4A super-precision tolerance class and a moderate preload (Class C), it delivers superior rotational accuracy, high system rigidity, and stable performance under high-speed operation, making it ideal for high-reliability, high-precision machinery.
7208 ACD/P4ATBTC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7208 | Basic bearing series; 40 mm bore, 80 mm OD, 18 mm width. |
| ACD | Angular Contact design with a 25° contact angle. |
| P4A | Indicates a super-precision tolerance class, exceeding ABEC 7/ISO P4 standards for exceptional running accuracy. |
| TBT | Specifies a Triplex Back-to-Back matched set of three bearings. |
| C | Denotes a moderate preload for optimal rigidity and reduced deflection under load. |
7208 ACD/P4ATBTC Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The triplex back-to-back arrangement creates a highly rigid bearing system capable of withstanding heavy combined radial and axial loads and tilting moments. The 25° contact angle is optimized for axial load carrying capacity.
Precision & High-Speed Performance: Manufactured to P4A tolerance standards, this bearing ensures minimal runout and vibration. The phenolic resin cage is lightweight and robust, contributing to smooth operation at high speeds with a limiting speed of 41,000 rpm. The bearings are pre-lubricated for immediate operation.
Premium Materials: Constructed from chrome steel for both rings and balls, ensuring high durability, wear resistance, and a long operational life under demanding conditions.
7208 ACD/P4ATBTC Bearing Typical Application Areas
This high-precision, high-rigidity bearing set is ideally suited for applications where extreme accuracy and stiffness are paramount. Key industries and equipment include:
- Machine Tool Spindles (High-speed machining centers, grinding spindles)
- Precision Rotary Tables and Indexing Heads
- High-Frequency Spindles for PCB drilling and routing
- Industrial Robotics (Arm joints, high-precision actuators)
- Aerospace & Defense instrumentation and guidance systems
