Description Threaded Flange The threaded surface of the middle hole of these threads is threaded and the tube can be screwed into it. One of the advantages of these flanges is that they do not require welding. Of course, welding can be used at high pressures if necessary. The efficiency of gear flanges is at high pressures. Threaded flanges are relatively widely used. Gear flanges are made both in the form of flanges with a simple surface and with an edge surface. The gear flanges produced in the market are mainly steel, cast iron and stainless steel 304 or 316. For more information, call 09339765265 Call 09123261608.