Standoff 3 : The longitudinal axial distance between specified reference points. A distance from the coupling face to the vanish point on the pipe. (RP 5A5)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}