71940 ACDGA/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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71940 ACDGA/P4A Bearing Product Overview & Core Advantages
The 71940 ACDGA/P4A is a single-row angular contact ball bearing designed for applications requiring ultra-high precision and exceptional rotational accuracy. Manufactured to P4A tolerance class, this bearing delivers superior dimensional stability and running accuracy. Its 25° contact angle is optimized to handle significant axial loads in one direction while supporting radial loads, making it ideal for high-speed, high-rigidity applications. The bearing comes pre-lubricated and features an open seal type for versatile lubrication management. As part of a Universal Matchable (SU) set, it enables precise preload control when mounted with other matched bearings.
71940 ACDGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Performance Implication |
|---|---|---|
| 71940 | Basic bearing designation | Defines the core dimensions: 200mm bore, 280mm OD, 38mm width |
| AC | Angular Contact design | Optimized for combined radial and axial loading |
| D | High ball complement design | Increased load capacity through 26 balls of 25.4mm diameter |
| GA | Universal Matchable bearing | Can be paired with other SU bearings for precise preload arrangements |
| P4A | Ultra-precision tolerance class | Tight dimensional tolerances (-0.004mm bore/OD) for high-precision applications |
71940 ACDGA/P4A Bearing Structural Features & Performance Benefits
Precision Engineering: The P4A tolerance class ensures minimal dimensional variation, critical for applications requiring exceptional running accuracy and positioning precision. The bore diameter tolerance of -0.004mm to 0 and outside diameter tolerance of -0.004mm to 0 guarantee consistent performance.
Enhanced Load Capacity: With a radial dynamic load rating of 44,775 lbf and radial static load rating of 56,250 lbf, this bearing delivers robust performance under demanding conditions. The 25° contact angle provides excellent axial load capacity while maintaining substantial radial load capability.
High-Speed Performance: The phenolic cage material offers excellent strength-to-weight ratio, contributing to the bearing's limiting speed of 6,300 rpm. This makes it suitable for high-speed spindle applications where centrifugal forces are significant.
Thermal Stability: The chrome steel construction of both rings and balls ensures dimensional stability across the operating temperature range of -30°C to 110°C, maintaining precision under thermal variations.
71940 ACDGA/P4A Bearing Typical Application Areas
Machine Tool Spindles: Ideal for high-precision machining centers, grinding spindles, and milling machine spindles requiring ultra-high precision and high-speed operation.
Precision Instrumentation: Suitable for measuring equipment, optical instruments, and laboratory apparatus where minimal runout and excellent rotational accuracy are critical.
Aerospace Components: Used in aircraft instrumentation, guidance systems, and auxiliary power units requiring high reliability and precision performance.
Medical Equipment: Applications in CT scanners, dental equipment, and surgical tools where smooth operation and precision positioning are essential.
Robotics and Automation: Perfect for robotic arm joints, precision positioning tables, and automated manufacturing equipment requiring high rigidity and accurate motion control.
