Knowing beforehand that, in the best of my knowledge, the patent rights for this thread type are "public" since a long while ago:
Does anyone know anything about the Vallourec (spec?) ST-D453.02 or where to get more information about it? It relates to the specific dimensions of the VAM thread, for which i need more information as part of a personal research project. The tolerances of it interest me the most.
The only things i know about it are the specific thread height dimensions (available in some threading insert brochures), and the TPI value (6 TPI instead of the "classic" API 5TPI) compared to the API BTC.
Hints of any kind are more than welcome!