Fasteners fail

Do the holes that the threads are screwing into have a counter bore? Those are also not allowed.

Do the holes break through creating a non square edge for selecting the fastener ending reference? In that's the case you'll need to first create a surface region to square off the bottom of the hole.

Also make sure there are no c'bores, rounds, or chamfers in the entire length of the fastern.

Hope this helps,

Don Anderson

I'll wager that it is a failure to correctly evaluate surface normals in the import geometry and that the solid modeling kernal has a tweak to hide the defect from the user but the analysis software doesn't. Like, all the normals are pointing inward.

It's also possible that there is a difference in hole construction. PTC's cylindrical surfaces have 6 unique edges and are split into two surface patches, but maybe the SW model doesn't.

I'm leaning more to the former as contacting surfaces should have opposing surface normals that point out. Not having that condition would certainly lead to an inability to find a contact.