Adding fastener components to an Autodesk Inventor assembly is often accomplished using the Bolted Connection command under the Design tab. When the assembly consist of per-assembled studs and the need to add washers and nuts arises, you will quickly find that the Bolted Connection command will not work. This is because this routine requires the placement of a screw or bolt before any washers or nuts are defined. In my assembly, I am using per-assembled studs.
The answer is to use a combination of routines found in the Place from Content Center command located on the Assemble tab. I have created a short video to describe the process.