Tool Marks

Surface roughness on thread, chamfer, or counterbore surfaces caused by the machining action and condition of the cutting edge of single-point, die, or chaser tools; also can occur in the form of a longitudinal ridge across thread crests due to an improperly shaped or adjusted chaser.

Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global Standards

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