S71903 CD/P4AQBCC
Sealed Super Precision Angular Contact Ball Bearings
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S71903 CD/P4AQBCC Bearing Product Overview & Core Advantages
The S71903 CD/P4AQBCC is a super-precision angular contact ball bearing designed for the most demanding applications. As part of a quadruplex back-to-back (QBC) matched set, it delivers exceptional system rigidity and rotational accuracy. Its key advantages include the ability to handle combined loads (radial and axial), superior high-speed performance enabled by its phenolic cage, and long-term reliability due to factory-applied grease lubrication. This bearing is engineered for applications requiring high rigidity and precise shaft guidance under moderate preload (Class C).
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| S71903 | Precision angular contact ball bearing series with 17mm bore, 30mm OD, and 28mm width. |
| CD | 15° contact angle and moderate preload (Class C). |
| P4A | High precision tolerance class (equivalent to ABEC 7), ensuring extremely tight running accuracy. |
| QBCC | Specifies the bearing is one of four in a matched set arranged in a Quadruplex Back-to-Back (QBC) configuration for maximum system rigidity. |
S71903 CD/P4AQBCC Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The quadruplex back-to-back arrangement creates an extremely stiff bearing system capable of supporting high combined loads and resisting moment loads. The 15° contact angle is optimized for high-speed operation while maintaining good axial load capacity.
Superior High-Speed Performance: The lightweight phenolic cage minimizes centrifugal forces, reduces friction, and allows for a high limiting speed of 85,000 rpm. This makes it an ideal high-speed bearing for precision spindles.
Precision & Reliability: Manufactured to P4A tolerance class, this bearing guarantees minimal runout and vibration. The sealed design with factory-applied grease lubrication protects against contamination and provides reliable operation within a temperature range of -30°C to 110°C, ensuring long service life with minimal maintenance.
S71903 CD/P4AQBCC Bearing Typical Application Areas
This high-precision bearing is primarily used in applications requiring extreme accuracy, high speed, and superior rigidity, such as:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling and routing machines.
- High-Frequency Motors: Spindles for aerospace and medical device manufacturing.
- Robotic Drives: High-accuracy rotary joints and actuators.
