UNI EN 755-8 : 2008

Foreword
1 Scope
2 Tolerances on dimensions
  2.1 General
  2.2 Diameter - Round tube
  2.3 Width, depth or width across flats - squares,
      rectangles, hexagons, octagons
  2.4 Wall thickness variation (eccentricity)
  2.5 Length
  2.6 Squareness of cut ends
3 Tolerances on form
  3.1 General
  3.2 Straightness
  3.3 Convexity- Concavity
  3.4 Twist
  3.5 Angularity
  3.6 Corner and fillet radii
  3.7 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 porthole 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.