71901 CD/P4ADBA
71900 Series Super Precision Angular Contact Ball Bearings
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71901 CD/P4ADBA Bearing Product Overview & Core Advantages
The 71901 CD/P4ADBA 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) standards, ensuring minimal axial and radial play for superior system stability. Its primary advantage lies in its ability to handle combined loads—significant radial loads alongside thrust loads in both directions—making it ideal for high-precision, high-speed spindles and machinery where high rigidity and precise shaft positioning are critical.
71901 CD/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71901 | Basic bearing series, indicating a high-precision angular contact bearing with a 12mm bore, 24mm OD, and 12mm width. |
| C | Specifies a 15° contact angle, optimized for high-speed operation and moderate axial load capacity. |
| D | Indicates the bearing is part of a duplex (matched) pair. |
| DB | Denotes the specific Back-to-Back arrangement of the matched set, providing high moment rigidity. |
| P4A | Signifies an ultra-high precision tolerance class (superior to ABEC 7), ensuring extremely tight dimensional and running accuracy. |
| Open | The bearing has no integral seals or shields, allowing for higher limiting speeds and custom lubrication schemes. |
71901 CD/P4ADBA Bearing Structural Features & Performance Benefits
High Rigidity & System Stability: The duplex back-to-back (DB) arrangement creates a wide, rigid support system that effectively resists moment loads and shaft deflection. Combined with the Class A preload, this configuration eliminates internal clearance, resulting in exceptional positional accuracy and vibration damping.
Superior High-Speed Performance: The phenolic resin cage is lightweight and possesses excellent sliding properties, reducing centrifugal forces and friction at high rotational speeds. The 15° contact angle is optimized to minimize heat generation, contributing to the high limiting speed of 140,000 rpm.
Precision & Load Capacity: Manufactured to P4A tolerance class, this bearing ensures minimal runout and smooth operation. It is rated for a dynamic load of 981 lbf and a static load of 562 lbf, providing reliable performance under combined radial and axial loads.
71901 CD/P4ADBA Bearing Typical Application Areas
The 71901 CD/P4ADBA is engineered for the most demanding precision applications, including:
- High-Frequency Machine Tool Spindles: For CNC milling, grinding, and drilling where maximum speed and accuracy are required.
- Precision Instrumentation: Used in measuring devices, optical scanners, and laboratory equipment.
- High-Speed Motors and Turbines: Ideal for supporting shafts in applications requiring minimal friction and high rotational stability.
