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As used herein, a “knuckle threads” or "round threads" refers to a type of screw thread having a rounded thread form. The rounded thread form results in a space between the rounded crests and roots. This space provides space for material or debris to be shifted to not interfere with the thread and engaged within the space. This thread form is resistant to debris and thread damage. (Search 'knuckle thread' on Wikipedia.com Jan. 23, 2021. Modified. Accessed Aug. 17, 2021.)

Added by DJM 9 2021