CLR – Center Line Radius
O.D. – Outside Diameter
DDWA – Degree of Die Wrap Around
DWBA – Die will Bend Around
I.D. – Inside Diameter; pipe sizes are measured by using I.D.
ERW – Welded Tubing. Beware this type of tubing has thin spots which may cause a bending problem. It is recommended when using this type to go one gauge thicker on the wall thickness
Minimum Wall – Minimum recommended wall thickness for good high quality bends when using D.O.M. or 4130 steel tubing