Skip to content
11. Joining by friction stir welding 13. Surface quality

12. Profile tolerances

The range of profiles that can be produced by extrusion is almost endless. For this reason, there are no general rules detailing potential solutions and applicable tolerances.

Profile design, wall thickness and alloy are critical factors that directly affect tolerances. In this connection, you should know that tighter tolerances can affect productivity and, consequently, price. Bear this in mind during the design stage.

Some profile manufacturers have standard tolerances of their own. Others use national standards for their production.

CEN, which is the European Committee for Standardization, has prepared European standards. These EN norms have gradually replaced the different national norms.

On the opposite page are extracts of the profile norms EN 755-9 and EN 12020-2. The content in the tables, including values, are collected directly from the complete norms.

close-up of hands holding a microscope

To view more of this chapter and the rest of the manual, log in or register here

11. Joining by friction stir welding 13. Surface quality