71928 ACD/P4AQBCD
71900 Series Super Precision Angular Contact Ball Bearings
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71928 ACD/P4AQBCD Bearing Product Overview & Core Advantages
The 71928 ACD/P4AQBCD is a precision quadruplex angular contact ball bearing designed for applications requiring exceptional rigidity and load capacity. This P4A tolerance class bearing features a matched arrangement of four bearings in a back-to-back configuration (QBC), delivering superior stability under combined radial and axial loads. With a heavy preload (Class D) and optimized 25° contact angle, it provides maximum system stiffness and positional accuracy for demanding industrial applications.
71928 ACD/P4AQBCD Bearing Model Code Explained, Specifications & Naming Convention
| Suffix | Technical Meaning |
|---|---|
| ACD | Angular Contact Design with 25° contact angle |
| P4A | High precision tolerance class with enhanced running accuracy |
| QBC | Quadruplex Back-to-Back arrangement for maximum rigidity |
| D | Heavy preload classification |
71928 ACD/P4AQBCD Bearing Structural Features & Performance Benefits
Exceptional Rigidity: The quadruplex back-to-back arrangement creates an extremely rigid bearing system capable of withstanding heavy moment loads while maintaining precise shaft positioning.
High Load Capacity: With a radial dynamic load rating of 53,550 lbf and radial static load rating of 99,000 lbf, this bearing handles significant combined loads in demanding applications.
Precision Performance: The P4A tolerance class ensures minimal runout and vibration, while the phenolic cage material provides excellent performance at limiting speeds up to 11,000 rpm.
Optimized Design: Featuring 29 chrome steel balls with 15.875 mm diameter and factory lubrication, the bearing delivers reliable operation across a temperature range of -30°C to 110°C.
71928 ACD/P4AQBCD Bearing Typical Application Areas
This high-precision quadruplex bearing is ideally suited for:
- Machine tool spindles requiring maximum rigidity and accuracy
- High-speed machining centers with heavy cutting loads
- Precision grinding spindles demanding minimal deflection
- Industrial robotics and automation systems
- Aerospace positioning systems requiring high load capacity
- Specialized medical equipment with precision motion requirements
