This is a set of Thread Profiles and CAD parts to use in your design for creating connections using the Standard Garden Hose Thread profile. Included are Excel spreadsheet of details as well as the STEP and STL files for integration and\or modification.
You can use a standard Garden Hose washer or make your own. Use Plumber's \ Teflon tape if desired but the washer was good enough for me.
This is a pretty good tutorial on how to do threads in DSM. This is two parts
Overview and Background
Designed to help those create their own thread profile if they wish or modify existing STEP files in their own project
Engineering for household
Lesson Plan and Activity