7208 CD/P4ADBG120
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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7208 CD/P4ADBG120 Bearing Product Overview & Core Advantages
The 7208 CD/P4ADBG120 is a precision angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This duplex back-to-back (DB) arrangement provides superior high rigidity and moment load capacity, making it ideal for high-speed spindles and precision machinery. Manufactured to P4A tolerance class, it ensures minimal runout and consistent performance under combined loads (radial and axial). The preloaded matched set eliminates internal clearance, delivering immediate precision and enhanced system stiffness.
7208 CD/P4ADBG120 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7208 | Basic bearing series, 40mm bore, 80mm OD |
| CD | Duplex arrangement in Back-to-Back (DB) configuration |
| P4A | High precision tolerance class (exceeding ABEC 7) |
| DB | Duplex Back-to-Back mounting |
| G120 | Specific preload level for optimal rigidity |
7208 CD/P4ADBG120 Bearing Structural Features & Performance Benefits
Enhanced Rigidity: The duplex back-to-back design creates a wide effective spread between load centers, significantly increasing system stiffness and moment load resistance. This is critical for maintaining precision under heavy combined loads.
Superior Load Capacity: With a 15° contact angle and optimized internal geometry, this bearing efficiently handles substantial radial and bidirectional axial loads simultaneously. The radial dynamic load rating of 12,442 lbf ensures long service life in demanding conditions.
High-Speed Capability: The phenolic resin cage provides excellent strength-to-weight ratio, reducing centrifugal forces and enabling operation at limiting speeds up to 41,000 rpm. The precision-ground chrome steel components minimize vibration and heat generation.
Precision Performance: Manufactured to P4A tolerance standards with tight dimensional controls (bore/OD tolerance: -0.004mm to 0), this bearing delivers exceptional running accuracy and minimal deflection for precision applications.
7208 CD/P4ADBG120 Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning centers requiring maximum rigidity and accuracy
- Precision Rotary Tables: Indexing and positioning systems demanding minimal runout
- High-Frequency Spindles: PCB drilling, dental machining, and small-part processing equipment
- Robotic Arm Joints: Precision automation systems requiring high moment load capacity
- Medical Equipment: CT scanners and laboratory automation with precision motion requirements
