71903 CD/P4ADGB
71900 Series Super Precision Angular Contact Ball Bearings
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71903 CD/P4ADGB Bearing Product Overview & Core Advantages
The 71903 CD/P4ADGB is a metric precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. As part of the universal matchable (SU) series, this bearing is supplied in a set of two, pre-configured with a light preload (Class B) for immediate installation without additional adjustment. Its 15° contact angle is optimized to support combined loads, handling significant radial loads and axial loads in one direction simultaneously. Manufactured to P4A tolerance class, it delivers superior running accuracy, low noise, and low vibration, making it ideal for high-speed spindles and other precision machinery.
71903 CD/P4ADGB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71903 | Basic bearing designation indicating a lightweight series angular contact ball bearing with a 17mm bore, 30mm OD, and 14mm width. |
| CD | Indicates a 15° contact angle and that the bearing is supplied as part of a universally matchable (SU) pair. |
| P4A | Denotes a high precision tolerance class, with enhanced dimensional and running accuracy exceeding ABEC 7/ISO P4 standards. |
| DGB | Signifies a duplex pair arrangement with a light preload (Class B), providing high system rigidity and precise shaft positioning. |
71903 CD/P4ADGB Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The universal matchable (SU) design, when mounted as a duplex pair (DGB), creates a rigid bearing system capable of withstanding combined radial and axial loads. The 15° contact angle effectively manages thrust loads.
- Superior High-Speed Performance: The phenolic resin cage offers low weight and excellent performance at the limiting speed of 121,000 rpm, reducing centrifugal forces and friction.
- Exceptional Precision: Manufactured to P4A tolerance class with tight bore, OD, and width tolerances, ensuring minimal runout and vibration for smooth, accurate operation.
- Optimized Material Selection: Components made from chrome steel provide high hardness, wear resistance, and durability, contributing to a long service life under demanding conditions.
71903 CD/P4ADGB Bearing Typical Application Areas
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and CNC lathes.
- Precision Instrumentation: Measuring devices, optical scanners, and coordinate measuring machines (CMM).
- High-Frequency Spindles: PCB drilling machines, dental handpieces, and small motor spindles.
- Robotics: Joints and actuators in precision industrial robots.
