Krishna Polished Carbon Steel Threaded Flanges, Shape : Round

Though threaded pipe flange is available in different dimensions, threaded fittings mostly is used in small diameters pipeline. (Below 4 inch normally.)

On the other hand, it is not compatible with a pipe system in thin wall thickness, since there is no space for doing the threading. 

Threaded Flange Types

There are two types of threaded flanges. One is to seal the two pipe ends with a certain sealing surface and a lens pad. This type of flange is mostly used for ammonia production. But it has been used less recently, and the lens pad has been replaced by a metal ring.

The other type is the same as a normal flange, sealed with two flange sealing faces.