Gouge or distortion in two or more thread crests in a line, either parallel to the pipe axis or at an angle across the threads.
Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global Standards
Incision without removal of metal caused by a sharp object.
Source: API RP 7G-2, Recommended Practice for Inspection and Classification of Used Drill Stem Elements, First Edition, August 2009. Global Standards