71805 CD/P4DBA
71800 Series Super Precision Angular Contact Ball Bearings
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71805 CD/P4DBA Bearing Product Overview & Core Advantages
The 71805 CD/P4DBA is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. This duplex back-to-back (DB) matched set is preloaded to Extra Light / Class A specifications, providing superior system stiffness and minimizing axial and radial runout. Its primary advantage lies in its ability to handle combined loads (radial and axial) simultaneously with high precision, making it ideal for high-speed spindles and other precision machinery where minimal deflection is critical.
71805 CD/P4DBA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71805 | Basic bearing designation, indicating a metric, single-row angular contact ball bearing with a 25 mm bore. |
| C | Designates a 15° contact angle, optimized for high-speed operation and moderate axial loads. |
| D | Indicates the bearing is supplied as a duplex pair. |
| P4 | Specifies a high precision tolerance class (P4), ensuring extremely tight dimensional and running accuracy. |
| DB | Denotes the Back-to-Back (DB) mounting arrangement, which provides high moment rigidity. |
| A | Specifies the preload level as "Extra Light" or "Class A". |
71805 CD/P4DBA Bearing Structural Features & Performance Benefits
High Rigidity & System Stability: The duplex back-to-back (DB) arrangement creates a wide effective spread of the load-carrying contact angles. This configuration significantly increases the system's resistance to moment loads and tilting, resulting in exceptional stiffness for precise positioning.
Optimized for High-Speed Operation: The 15° contact angle and lightweight phenolic resin cage reduce centrifugal forces and friction, enabling a high limiting speed of 103,000 rpm. This makes the bearing suitable for demanding high-speed applications.
Precision & Accuracy: Manufactured to P4 tolerance class, this bearing ensures minimal runout and vibration. The preload eliminates internal clearance, enhancing rotational accuracy and dynamic response.
Superior Load Capacity: The bearing is designed to handle combined radial and axial loads effectively. The matched set and precise geometry ensure consistent performance and load distribution across both bearings.
71805 CD/P4DBA Bearing Typical Application Areas
- High-Frequency Machine Tool Spindles
- Precision Grinding Spindles
- High-Speed Motors
- Medical and Dental Handpieces
- Aerospace Instrumentation
- Semiconductor Manufacturing Equipment
