Tool Joint 1 : A drill pipe coupler consisting of a pin and box of various designs and sizes. The internal design of tool joints has an important effect on drilling fluid hydrology. (Bul D11)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}