Describes tolerances for cold formed welded circular, square, rectangular and elliptical structural hollow sections, manufactured in wall thicknesses up to 40 mm, in the following size ranges: - Circular: Outside diameters up to 2500 mm, - Square: Outside dimensions up to 500 mm x 500 mm, - Rectangular: Outside dimensions up to 500 mm x 300 mm, and - Elliptical: Outside dimensions up to 480 mm x 240 mm