71905 CD/P4ADBCGMM
71900 Series Super Precision Angular Contact Ball Bearings
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71905 CD/P4ADBCGMM Bearing Product Overview & Core Advantages
The 71905 CD/P4ADBCGMM is a super-precision angular contact ball bearing designed for the most demanding applications. As a duplex back-to-back (DB) matched pair, it delivers exceptional system rigidity and stability. This bearing is engineered to handle combined loads (radial and axial) simultaneously and is optimized for high-speed operation. Manufactured to the stringent P4A tolerance class and preloaded to Moderate / Class C, it guarantees superior running accuracy and performance consistency in precision machinery.
Model Code Breakdown
- 71905: Basic designation for a super-precision, light-weight angular contact ball bearing series with a 25mm bore and 42mm outside diameter.
- C: Signifies a 15° contact angle, optimized for high-speed performance.
- D: Indicates the bearing is part of a duplex pair.
- P4A: Denotes an ultra-high precision tolerance class exceeding ABEC 7, ensuring minimal runout and vibration.
- DB: Specifies the duplex back-to-back arrangement, which provides high moment rigidity.
- CG: Code for the specific Moderate / Class C preload applied to the matched set.
- MM: Indicates the bearings are universally matchable in a back-to-back (DB) or face-to-face (DF) arrangement, offering mounting flexibility.
71905 CD/P4ADBCGMM Bearing Structural Features & Performance Benefits
High Rigidity & Stability: The duplex back-to-back (DB) arrangement creates a wide, rigid support system that effectively resists moment loads and shaft deflection, crucial for maintaining precision under load.
Superior High-Speed Capability: The combination of a 15° contact angle, a lightweight phenolic resin cage, and precision P4A grading minimizes centrifugal forces and friction, enabling stable operation at the high limiting speed of 100,500 rpm.
Exceptional Load Capacity: With a dynamic load rating of 2498 lbf and a static load rating of 1800 lbf, this bearing is built to handle significant combined radial and axial loads.
Optimized for Precision: The P4A tolerance class and controlled preload ensure minimal runout, high rotational accuracy, and predictable performance, which is essential for applications requiring extreme precision.
71905 CD/P4ADBCGMM Bearing Typical Application Areas
This high-precision bearing is ideally suited for applications where maximum rigidity, speed, and accuracy are paramount. Key industries and equipment include:
- Machine Tool Spindles (High-speed machining centers, grinding spindles)
- Precision Robotic Drives
- High-Frequency Spindles for PCB drilling and routing
- Medical and Dental Equipment (High-speed handpieces, scanners)
- Aerospace Gyroscopes and Instrumentation
