71905 CD/HCP4ADBB
Hybrid Ceramic Super Precision Bearings
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71905 CD/HCP4ADBB Bearing Product Overview & Core Advantages
The 71905 CD/HCP4ADBB is a precision angular contact ball bearing supplied as a duplex back-to-back (DB) matched set. Engineered for exceptional performance in demanding applications, this bearing is characterized by its P4A super-precision tolerance, light preload (Class B), and use of ceramic balls. This configuration delivers superior rotational accuracy, high stiffness, and is optimized for high-speed operation, making it an ideal solution for machine tool spindles and other high-precision machinery.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 71905 | Bearing series and size designation (25mm bore, 42mm OD, 18mm width) |
| CD | Duplex Back-to-Back (DB) matched arrangement |
| HC | Hybrid Ceramic (Silicon Nitride) ball material |
| P4A | Super-precision tolerance class (exceeding ABEC 7) |
| DBB | Duplex Back-to-Back specific preload and matching designation |
71905 CD/HCP4ADBB Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex back-to-back (DB) arrangement creates a rigid bearing system that can withstand combined loads (radial and axial) from both directions, providing exceptional moment stiffness.
- Superior High-Speed Performance: The combination of a light phenolic cage, hybrid ceramic balls (reducing centrifugal forces and friction), and a 15° contact angle enables a very high limiting speed of 100,500 rpm.
- Enhanced Precision and Life: The P4A tolerance class ensures minimal runout and vibration for superior rotational accuracy. Ceramic balls offer higher hardness, lower thermal expansion, and electrical insulation, leading to extended bearing service life, especially in lubricant-starved conditions.
- Optimized Preload: The light preload (Class B) is factory-set to eliminate internal clearance, ensuring precise shaft positioning and immediate response to load changes without the need for customer adjustment.
71905 CD/HCP4ADBB Bearing Typical Application Areas
This high-precision, high-speed bearing set is specifically designed for advanced applications where maximum accuracy and stiffness are critical. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy rotary actuators.
- Aerospace & Defense: Gyroscopes, radar systems, and auxiliary power units (APUs).
- Medical Equipment: High-speed dental handpieces and laboratory centrifuges.
- Semiconductor Manufacturing: Wafer handling robots and precision stages.
