Strength: they are slotted bushings with interior and exterior thread, designed to tap their own threads as soon as they are driven into drilled or die-cast holes in order to increase the tensile strenght in any screw connection.
The thread-cutting action is performed by the slot on the pilot portion of the insert.
they withstand vibrations without loosening and this has been proved by many tests in several parts of engines and machineries.
as they don't need pre-tapping of holes and they are suitable for fastenings with automatic feeders during belt productions.
Economization: by tapping their own threads they avoid costs of pre-tapped holes for helically coiled wire thread inserts.
Method of assembling:
The presence of chips shows the thread-cutting action
The most economical system to repair damaged threads on work material