Class 150 Weld neck RTJ Flange Dimensions ; 1 1/4, 32, 115 ; 1 1/2, 40, 125 ; 2, 50, 150 ; 2 1/2, 65, 180 ......
Rotary Joint (RTJ) flanges are essential components in various industrial applications, facilitating the transfer of fluids or gases while allowing rotation. Understanding RTJ flange dimensions is crucial for selecting the right component for your system. This guide provides an in-depth look at RTJ flange dimensions, their importance, and how to read and use a dimensions chart.
Accurate RTJ flange dimensions ensure proper fit, performance, and safety in your system. Incorrect dimensions can lead to leaks, equipment damage, or even system failure. Therefore, it's vital to choose the right RTJ flange based on your specific requirements.
RTJ flange dimensions charts display key dimensions in a structured format, typically arranged by bore size or model number. Here's how to read and interpret a chart:
| Model | Bore (ID) | Outside Diameter (OD) | Hub Diameter | Hub Length | Face Width | Bolts/Holes |
|---|---|---|---|---|---|---|
| RTJ-50 | 50 mm | 120 mm | 60 mm | 30 mm | 20 mm | 4 x M12 |
| RTJ-75 | 75 mm | 150 mm | 70 mm | 40 mm | 25 mm | 6 x M16 |
In the example above, the RTJ-50 model has a bore of 50 mm, an outside diameter of 120 mm, and uses 4 bolts with an M12 thread. The RTJ-75 model, on the other hand, has a larger bore and uses 6 bolts with an M16 thread.
Several factors influence RTJ flange dimensions, including:
Considering these factors helps you select the appropriate RTJ flange for your application, ensuring optimal performance and safety.

Understanding RTJ flange dimensions is essential for selecting the right component and ensuring proper system operation. By familiarizing yourself with key dimensions, reading dimensions charts, and considering relevant factors, you can make informed decisions when specifying or replacing RTJ flanges. Always consult the manufacturer's guidelines for the most accurate and up-to-date information.
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