A threaded connection on Oil Country Tubular Goods (OCTG) that has internal (female) threads.
Source: API RP 7G, Recommended Practice for Drill Stem Design and Operating Limits, Upstream Segment, Sixteenth Edition, August 1998 (Addendum 2: September 2009). Global Standards
Threaded connection on oilfield tubular goods (OCTG) that has internal (female) threads.
Source: API SPEC 7-1, Specification for Rotary Drill Stem Elements, First Edition, March 2006 (Addendum April 2011). Global Standards