ČSN EN 10305-3

This document specifies the technical delivery conditions for welded cold sized steel tubes of circular cross section with specified outside diameter D <= 193,7 mm and of square and of rectangular cross section for precision applications.
This document can also be applied to welded cold sized tube with other cross section shapes.
Tubes according to this document are characterized by having precisely defined tolerances on dimensions and a specified maximum surface roughness. Typical fields of application are in the automotive, furniture and general engineering industries.