API Spec 7-1 (R2015)
API Spec 7-1 (R2015)
Specification for Rotary Drill Stem Elements, First Edition -- Identical to ISO 10424-1:2004, Includes Addendum 1 (2007), Addendum 2 (2009), Addendum 3 (2011), and Addendum 4 (2019)standard by American Petroleum Institute, 02/01/2006