ISO 3305 is standard for Plain end welded precision steel tubes - Technical conditions for delivery.International Standard IS0 3305 was prepared by Technical Committee ISO/TC 5,
Ferrous metal pipes and metallic fittings.
ISO 3305 specifies the technical conditions for delivery of welded tubes with plain ends, manufactured from the grades of steel , with precision dimensional tolerances and in those dimensions which have been selected from IS0 4260.
Tubes in accordance with this International Standard are used mainly for purposes where importance attaches to dimensional accuracy and, if required, small thicknesses and surface finish.
If such tubes are intended for use in hydraulic piping equipment, they shall be used only in the annealed or normalized delivery condition.