71940 ACD/P4ADBA
71900 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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71940 ACD/P4ADBA Bearing Product Overview & Core Advantages
The 71940 ACD/P4ADBA is a precision duplex angular contact ball bearing designed for applications requiring exceptional rotational accuracy and rigidity. This P4A tolerance class bearing features a back-to-back (DB) matched arrangement, providing superior stability and the ability to withstand combined radial and axial loads. With its extra light preload and optimized 25° contact angle, it is engineered for high-speed operation and precise positioning in demanding industrial environments.
71940 ACD/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71940 | Basic bearing series and size designation |
| AC | Angular Contact design |
| D | Duplex (two bearings in set) |
| P4A | High precision tolerance class (superior to ABEC 7) |
| DB | Back-to-Back mounting arrangement |
| A | Extra light preload classification |
71940 ACD/P4ADBA Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The back-to-back duplex arrangement creates a wide effective spread between load centers, significantly enhancing moment stiffness and enabling the bearing to handle combined radial and axial loads simultaneously. With a radial dynamic load rating of 73,125 lbf and static load rating of 112,500 lbf, it delivers reliable performance under heavy operating conditions.
Precision & High-Speed Performance: Manufactured to P4A tolerance class standards with extremely tight dimensional tolerances (bore/OD tolerance: -0.004mm to 0), this bearing ensures minimal runout and vibration. The phenolic cage and 25° contact angle contribute to stable operation at limiting speeds up to 16,250 rpm, making it ideal for high-speed applications.
Optimized Material Selection: Constructed from chrome steel for both rings and balls, the bearing offers excellent wear resistance and durability. The phenolic cage provides superior strength-to-weight ratio and operates effectively across the temperature range of -30°C to 110°C.
71940 ACD/P4ADBA Bearing Typical Application Areas
- Machine Tool Spindles: High-precision machining centers, grinding spindles, and milling heads
- High-Speed Industrial Pumps: Centrifugal pumps and turbine pumps requiring precise shaft positioning
- Precision Gearboxes: Industrial transmission systems demanding high rigidity and accuracy
- Robotics & Automation: Robot arm joints, rotary tables, and precision positioning systems
- Aerospace Components: Aircraft auxiliary systems and precision instrumentation
