NBN EN 10305-4:2003

This European Standard specifies the technical delivery conditions for seamless cold drawn steel tubes of circular cross section used in hydraulic and pneumatic power systems.
Tubes according to European are characterized by having precisely defined tolerances on dimensions and a specified surface roughness.
The allowed pressure rates and temperatures are the responsibility of the customer in accordance with the state of the art and in application of the safety coefficients specified in the applicable regulations, codes or standards.