71905 CD/P4ADT
71900 Series Super Precision Angular Contact Ball Bearings
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71905 CD/P4ADT Bearing Product Overview & Core Advantages
The 71905 CD/P4ADT is a precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. This duplex tandem (DT) arrangement bearing set is preloaded and manufactured to P4A tolerance class, ensuring ultra-high running accuracy and system rigidity. Its primary advantage lies in its ability to handle significant combined loads (radial and axial) in one direction with maximum stiffness, making it ideal for high-speed, high-precision spindles and machinery.
71905 CD/P4ADT Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71905 | Basic bearing designation (25mm bore, 42mm OD, 18mm width) |
| C | 15° contact angle |
| D | Duplex bearing designation |
| P4A | High precision tolerance class (superior to ABEC 7) |
| DT | Duplex Tandem arrangement (two bearings mounted face-to-face to increase axial load capacity in one direction) |
71905 CD/P4ADT Bearing Structural Features & Performance Benefits
Optimized for High Rigidity and Precision: The duplex tandem arrangement creates an exceptionally rigid bearing system, crucial for minimizing deflection in precision spindles. The 15° contact angle is optimized for high-speed operation while maintaining good axial load capacity.
Superior High-Speed Capability: The phenolic cage (specified in the data) is lightweight and possesses excellent sliding properties, contributing to the high limiting speed of 100,500 rpm. This, combined with the precision-ground chrome steel components, ensures smooth operation at extreme velocities.
Pre-Configured for Immediate Use: The set is supplied preloaded and lubricated, eliminating the need for complex on-site adjustment. This guarantees consistent performance, reduces assembly time, and ensures optimal bearing life from the first rotation.
71905 CD/P4ADT Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and drilling spindles where precision and rigidity are paramount.
- Precision Rotary Systems: Applications in semiconductor manufacturing, coordinate measuring machines, and optical scanners.
- High-Frequency Motors: Spindles for PCB drilling and other high-RPM electric motors.
- Medical Equipment: High-speed handpieces and dental drills requiring smooth, precise rotation.
