71905 ACD/P4ADBA
71900 Series Super Precision Angular Contact Ball Bearings
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Main Dimensions
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71905 ACD/P4ADBA Bearing Product Overview & Core Advantages
The 71905 ACD/P4ADBA is a metric precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. This bearing features a duplex back-to-back (DB) arrangement with an extra light preload (Class A), making it ideal for high-speed spindles and other precision machinery. Its primary advantage lies in its ability to support combined radial and axial loads simultaneously while maintaining high running accuracy and system stability under demanding conditions.
71905 ACD/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71905 | Basic bearing series and size designation (25mm bore, 42mm OD, 18mm width) |
| AC | Angular Contact design with a 25° contact angle |
| D | Duplex configuration (two bearings supplied as a set) |
| P4A | High Precision Tolerance Class (equivalent to ABEC 7) |
| DB | Back-to-Back mounting arrangement for improved moment load capacity |
| A | Extra Light Preload for minimal friction at high speeds |
71905 ACD/P4ADBA Bearing Structural Features & Performance Benefits
High Rigidity & Precision: The duplex back-to-back configuration creates a rigid bearing system that effectively resists moment loads and maintains precise shaft positioning. Combined with P4A tolerance class, this ensures exceptional running accuracy for precision applications.
Optimized Load Capacity: With a 25° contact angle, this bearing efficiently handles combined radial and axial loads in both directions. The DB arrangement significantly increases system stiffness and moment load capacity compared to single bearings.
High-Speed Capability: The phenolic resin cage provides excellent dimensional stability and low friction at high rotational speeds, supporting the bearing's limiting speed of 103,000 rpm. The extra light preload minimizes heat generation during high-speed operation.
Premium Material Construction: Manufactured from chrome steel for both rings and balls, this bearing delivers high fatigue resistance and long service life in demanding industrial environments.
71905 ACD/P4ADBA Bearing Typical Application Areas
- Machine Tool Spindles - High-speed machining centers and precision grinding machines
- Precision Instrumentation - Measuring equipment and optical devices requiring minimal runout
- High-Speed Motors - Spindle motors and other high-RPM electric motors
- Medical Equipment - Dental handpieces and laboratory instrumentation
- Aerospace Components - Guidance systems and auxiliary power units
