I'm researching the use of PMI data in a MBD model for use in manufacturing.

I wasn't able to find any information about how threads (e.g. M10) and the ISO system of Limits and Fits (e.g. 20 H5) are handled within STEP AP242. In most CAD systems these are handled very well within the 3D annotations of the native model but once you export them to STEP AP242 you lose a lot of information. This limits the automated use of PMI data when exchanging this data. So I'm wondering whether I'm missing something or whether this is lacking within the STEP AP242 definition or the way it is implemented.

Any help to help me understand this is very much appreciated.