71948 ACD/P4ADBC
71900 Series Super Precision Angular Contact Ball Bearings
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71948 ACD/P4ADBC Bearing Product Overview & Core Advantages
The 71948 ACD/P4ADBC is a precision duplex back-to-back angular contact ball bearing designed for applications demanding exceptional rigidity and accuracy. This P4A tolerance class bearing is preloaded and matched as a set, providing superior performance in handling combined radial and axial loads. Its robust construction and moderate preload (Class C) make it ideal for high-precision, high-stiffness systems requiring minimal runout and precise shaft positioning.
71948 ACD/P4ADBC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71948 | Basic bearing designation |
| AC | Angular Contact design with 25° contact angle |
| D | Duplex arrangement |
| P4A | High precision tolerance class with specific running accuracy requirements |
| DB | Back-to-Back mounting arrangement |
| C | Moderate preload classification |
71948 ACD/P4ADBC Bearing Structural Features & Performance Benefits
Enhanced Rigidity & Stability: The duplex back-to-back (DB) configuration creates a rigid bearing system that effectively resists moment loads and maintains shaft stability under combined loading conditions. This arrangement provides optimal support for precision applications.
Superior Load Capacity: With a 25° contact angle and 31 high-quality chrome steel balls, this bearing delivers excellent performance in handling both radial and axial loads simultaneously. The radial dynamic load rating of 78,975 lbf and static load rating of 137,250 lbf ensure reliable operation under demanding conditions.
High-Speed Capability: The phenolic cage material provides excellent strength-to-weight ratio, contributing to the bearing's ability to operate at limiting speeds up to 7,500 rpm while maintaining dimensional stability.
Precision Performance: Manufactured to P4A tolerance class with tight dimensional tolerances (bore and OD tolerance: -0.004mm to 0), this bearing ensures minimal runout and precise rotational accuracy essential for high-precision machinery.
71948 ACD/P4ADBC Bearing Typical Application Areas
- Machine Tool Spindles - High-precision milling, grinding, and turning centers
- Precision Gearboxes - Industrial transmission systems requiring high rigidity
- Robotic Systems - High-accuracy robotic arms and positioning systems
- Medical Equipment - CT scanners, MRI machines, and surgical robots
- Aerospace Systems - Flight control mechanisms and auxiliary power units
- High-Speed Compressors - Industrial air and gas compression systems
