Currently, this is a limitation (SPR557654). Composer can bring in either Decals or Textures (depending on the import settings). However, cosmetic thread appearances are neither decals nor textures in SOLIDWORKS CAD so they do not get translated by default. You would have to manually apply a decal to the hardware in SOLIDWORKS or use the ‘Thread’ tool to create actual geometry that would be visible in Composer.
Composer creates a single SVG file for each view, and then the SVG files are setup to be linked in Composer after all of them have been published to create the navigation. If you want to create a single file with similar navigation consider using an SMG file. This can be viewed in Composer Player and will retain the interactivity and navigation capabilities of an SVG but also includes the ability to rotate and perform animations. I hope that helps!
