I'm not quite sure how this question ended up in this forum, as it is clearly off-topic, but anyway:
It totally depends on what the third-party needs to do with the model and what CAD software they have. If they don't have SIEMENS NX, then the popular export options are the vendor-neutral standards:
- STEP:
.step
/.stp
Standard for the Exchange of Product model data
- IGES:
.iges
/.igs
Initial Graphics Exchange Specification
- JT:
.jt
Jupiter Tessellation
or the open standards:
- STL:
.stl
Stereolithography created by 3D Systems (mistakenly refered to as Surface/Standard Triangulated Language)
- OBJ:
.obj
developed by Wavefront Technologies
- VRML:
.wrl
Virtual Reality Modeling Language vector file
beware that exporting from NX to any of the above formats can cause "topology anomalies" (more info). If the third-party company does have access to SIEMENS PLM products (e.g., NX, SolidEdge...) or any of the CAD software with ParaSolid engine (e.g., SolidWorks) then exporting as ParaSolid .x_t
is the best option. And if they do have NX then another option is to unparametrize your mono-part(s) from Menu > Edit > Feature > Remove Parameters...
. Then I think they will show up in the "Non-Timestamp Geometry" grouping in the "Part Navigator" panel.