First, you use Inventor to export the model as an SAT file.
Open Autodesk Inventor and export the part to SAT format:
If you don’t have Autodesk Inventor 2015 installed on your system, you can skip ahead to the next lesson, Import the Model into 3ds Max.
Autodesk Inventor.
Launch panel, click This model is of a small blade clamp mounted on a pin.

CAD Format. Inventor opens a Save Copy As dialog.

Inventor saves my_blade_clamp.sat in the same folder as blade_clamp.ipt.