UNI EN 755-7 : 2008

Foreword
1 Scope
2 Alloy groups
3 Tolerances on dimensions
  3.1 General
  3.2 Diameter - Round tube
  3.3 Width, depth or width across flats - squares,
      rectangles, hexagons, octagons
  3.4 Wall thickness variation (eccentricity)
  3.5 Length
  3.6 Squareness of cut ends
4 Tolerances on form
  4.1 General
  4.2 Straightness
  4.3 Convexity-Concavity
  4.4 Twist
  4.5 Angularity
  4.6 Corner and fillet radii
  4.7 Depth of dents for round tube
Annex A (informative) - Wall thickness variation
        (eccentricity)
      A.1 General
      A.2 Specifying round tube sizes and tolerances
          A.2.1 General
          A.2.2 Wall thickness variation for tubes specified
                as OD x t or ID x t
          A.2.3 Wall thickness variation for tubes specified
                as OD x ID
Bibliography

Describes the tolerances on dimensions and form for aluminium and aluminium alloy extruded seamless tubes with an outside diameter (OD) from 8 mm to 450 mm (round tube) or with a cross section contained within a circumscribing circle (CD) from 10 mm to 350 mm (other than round tube), supplied in straight lengths.