This, it said, is in order to provide a robust thread in moulded/fabricated plastic components where the softness of the substrate precludes a tapped thread. Brass threaded inserts are a favourite for use throughout industry where they can provide a quick thread just by drilling or moulding a pilot hole and pressing the insert into place.
A well-known and much used solution to fixing onto non-metals, brass threaded inserts can often provide higher torque or pull-out performance by the application of heat or ultrasonic energy to further embed the insert into its substrate.
Expansion and self-tapping inserts are also available in brass for use in plastics or in the case of wood, and some composite materials, steel and stainless self-tapping inserts can be supplied.