2008NF A50-630-8:2008 Aluminium and aluminium alloys - Extruded rod/bar, tube and profiles - Part 8 : porthole tubes, tolerances on dimensions and form.
1998NF A50-637:1998 Aluminium and aluminium alloys. Extruded rod/bar, tube and profiles. Part 8 : porthole tubes, tolerances on dimensions and form.