This standard is included in DIN Handbook 450 and 450/1. Defines tolerances on dimensions and form of square, rectangular and shaped HF seam welded tubes, made from rolled aluminium alloy strip longitudinally welded in a continuous process by passing of an electric current across the abutting edges without the addition of filler metal. Applicable also to tubes made from aluminium alloy strips, which is painted, lacquered or anodized before forming.