Historical
DIN EN 754-7:1998
Aluminium and aluminium alloys - Cold drawn rod/bar and tube - Part 7: Seamless tubes, tolerances on dimensions and form (FOREIGN STANDARD)
The document specifies the tolerances on dimensions and form for aluminium and aluminium alloy cold drawn seamless tubes with an outside diameter (OD) from 3 mm to 350 mm (round tube) or with a cross section contained within a circumscribing circle (CD) form 8 mm to 300 mm (other than round tube), supplied in straight lenghts. It only applies to tube produced by the seamless die/mandrel method of extrusion (and then cold drawn to be final dimensions required). It applies to cold drawn, seamless tube for general and engineering applications.
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Deutsches Institut für Normung [din]