Flange, Threaded : A flange having a sealing face on one side and a female thread on the other for the purpose of joining flanged connections to threaded connections. (Spec 6A)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}