Threaded flange is a non-welded flange that uses threads to connect to pipes. The inner hole of the flange is processed into pipe threads and matched with threaded pipes to achieve connection. Its design principle can be handled as a loose flange. The advantage is that it does not require welding, and the additional torque generated on the cylinder or pipe when the flange is deformed is very small. However, the disadvantage of threaded flanges is that the flange thickness is large and the cost is high. Threaded flanges are widely used in pipeline systems that require high-pressure connections, especially in places where welding is not allowed. Due to its convenience in installation and maintenance, threaded flanges have important applications in the industrial field.