Tight radii in stainless steel pipes are always a big issue. Part of the specialist knowledge is that most rectangular and square tubes are always made from round tubes in a continuous manufacturing process. Due to this continuous type of deformation of the profiles by pressing and forming frames, the shape tolerances and flatness of the surfaces can`t be recorded and precisely defined. Exceptions are the profiles welded together from two U-shaped edged and shaped profiles. Due to this fact, differently pronounced radii result. As a rule of thumb, it can be assumed that the radius is approx. 2-3 times the material thickness. Further information on the subject of edge radii for square and rectangular tubes can be found in our image sequence in the stock program for the profiles.