Vanish Point : The location where the thread root runs out or terminates on the pipe surface. The point where the lead of the chaser tool makes its final cut. (RP 5A5)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}