prEN 755-8

This document specifies 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, see Figure 1) or with a cross section contained within a circumscribing circle (CD) from 10 mm to 350 mm (other than round tube, see Figure 2), supplied in straight lengths.
The temper designations used in this part are according to EN 515.
This document only applies to tube produced by the tube porthole/bridge method.
This document does not apply to:
—  extruded tubes produced by the seamless, die/mandrel method (EN 755-7);
—  tubes delivered in coils (EN 13957);
—  coiled tubes cut to length (EN 13957).

Figure 1 — Round tube

Figure 2 — Circumscribing circle for other than round tube