71805 ACD/P4DBA
71800 Series Super Precision Angular Contact Ball Bearings
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71805 ACD/P4DBA Bearing Product Overview & Core Advantages
The 71805 ACD/P4DBA is a metric duplex back-to-back angular contact ball bearing designed for ultra-precision applications requiring exceptional rotational accuracy and rigidity. This P4 tolerance class bearing is pre-lubricated and features an extra light preload (Class A), making it ideal for high-speed spindles and other machinery where minimal runout and high system stiffness are critical. Its duplex DB arrangement enables it to withstand combined radial and axial loads simultaneously, providing stable and precise rotational performance.
71805 ACD/P4DBA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71805 | Basic bearing series designation |
| AC | Angular Contact design with 25° contact angle |
| D | Duplex configuration (two bearings) |
| P4 | High precision tolerance class (superior running accuracy) |
| DB | Back-to-Back mounting arrangement |
| A | Extra light preload classification |
71805 ACD/P4DBA Bearing Structural Features & Performance Benefits
High Rigidity & Precision: The duplex back-to-back (DB) arrangement creates a rigid bearing system that effectively resists moment loads, ensuring exceptional positioning accuracy and minimal deflection under operational stresses.
Superior Load Capacity: With a 25° contact angle and optimized internal geometry, this bearing efficiently handles combined radial and axial loads in both directions, making it suitable for complex loading conditions.
High-Speed Capability: The phenolic resin cage provides excellent dimensional stability and low friction at high speeds, contributing to the bearing's impressive limiting speed of 85,000 rpm. The pre-lubrication ensures consistent performance throughout the operating range.
Precision Engineering: Manufactured to P4 tolerance class with tight dimensional controls on bore, outside diameter, and width, this bearing delivers exceptional running accuracy and consistent performance in precision applications.
71805 ACD/P4DBA Bearing Typical Application Areas
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and precision lathes
- Precision Instruments: Measuring equipment, optical instruments, and laboratory devices
- High-Speed Motors: Servo motors, spindle motors, and other high-RPM electric motors
- Medical Equipment: Dental handpieces, surgical tools, and diagnostic imaging systems
- Aerospace Components: Gyroscopes, navigation systems, and flight control mechanisms
