Bend radii and diameters will refer to either the inside or center line of a bend. There is often confusion between radius versus diameter. Note in the diagram below that the diameter is two times the radius. Therefore a 180ยบ bend on a 7" center line radius would yield a 14" center line diameter (14.00" center-to-center). Throughout this catalog r is used to refer to inside diameter while R represents center line radius. The inside radius (r) is equal to the center line radius (R) less half the OD or width of the tubing being bent.
r = R - (OD/2)
