Break bridge

An extrusion that is difficult to produce with close fit tolerances, such as the extrusion below, can be made by producing the extrusion as a hollow extrusion.

The opening is closed with a seal known as a “break bridge”, which is removed after final heat treatment. This ensures that the opening is imbued with close fit tolerances. In addition, the process can also act as a sort of in transit protection for delicate or fragile extrusions.