Harley-Davidson will close their New Castalloy factory, impacting 120 local workers.
The factory, which will be shut down in just over a year, also happens to be at the centre of a renewed search for the Beaumont children.
The Australian Workers Union said 120 jobs will be lost.
Harley-Davidson will be closing two operations, another in Kansas after shipments plummeted.
Workers in the Adelaide factory received the news late yesterday.