Tool Marks : Cuts or tears to thread crests caused by thread dies or chasers; ridges, steps, or burrs in the thread flanks caused by chipped or broken threading tools, and shaved threads. (RP 54)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}