7208 CD/P4ADBAGMM2
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 CD/P4ADBAGMM2 Bearing Product Overview & Core Advantages
The 7208 CD/P4ADBAGMM2 is a precision duplex angular contact ball bearing designed for applications requiring exceptional rotational accuracy and rigidity. This matched back-to-back (DB) arrangement enables the bearing to accommodate combined radial and axial loads from both directions simultaneously. Manufactured to P4A tolerance class with an extra light preload (Class A), it delivers superior running accuracy, high system rigidity, and excellent high-speed performance, making it ideal for high-precision machinery and spindles.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 7208 | Basic bearing series: Angular contact ball bearing with 40mm bore, 80mm OD, 36mm width |
| C | 15° contact angle design |
| D | Duplex bearing arrangement |
| P4A | High precision tolerance class (superior to ABEC 7) |
| DB | Back-to-back mounting arrangement |
| A | Extra light preload (Class A) |
| GMM | Precision matched set with specific axial and radial clearance |
| 2 | Number of bearings in matched set |
7208 CD/P4ADBAGMM2 Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex back-to-back configuration creates a rigid bearing system that effectively resists moment loads and provides stable support for shafts. With a radial dynamic load rating of 12,442 lbf and static load rating of 10,800 lbf, this bearing arrangement delivers exceptional load-carrying capacity for combined radial and axial loading conditions.
Precision Performance: Manufactured to P4A tolerance class with tight dimensional control (bore/OD tolerance: -0.004mm to 0), this bearing ensures minimal runout and vibration. The 15° contact angle provides optimal balance between radial and axial load capacity while maintaining high-speed capability.
High-Speed Capability: The phenolic resin cage offers excellent strength-to-weight ratio, reducing centrifugal forces and enabling limiting speeds up to 41,000 rpm. The lightweight construction and precision manufacturing contribute to reduced friction and heat generation at high rotational speeds.
Material Excellence: Constructed from chrome steel for both rings and balls, this bearing provides high hardness, wear resistance, and dimensional stability. The material selection ensures long service life and reliable performance in demanding applications.
7208 CD/P4ADBAGMM2 Bearing Typical Application Areas
- Machine Tool Spindles: High-precision milling, grinding, and turning centers requiring extreme accuracy and rigidity
- High-Speed Spindles: PCB drilling machines, dental handpieces, and small precision machining centers
- Precision Instrumentation: Measuring equipment, optical instruments, and laboratory apparatus
- Robotics: High-precision robot joints and servo motor applications
- Aerospace Components: Gyroscopes, navigation systems, and aircraft instrumentation
- Medical Equipment: High-speed dental drills and surgical handpieces
