Keywords: Knuckle Thread Form.svg Uploaded with en wp UW marker 2014 01 14 This is a cross section through a knuckle thread This thread form has very rounded tips illustrated by the circles at the thread tip and clearance at the thread root There is also a flat area with a 30 degree thread angle Specifically this is modeled from a DIN 20400 Rd300x16 thread It demonstrates that when interior and exterior threads mate the enlarged pitch diameter of this thread form leaves substantial room at the tips for deformation or debris Prepared in Inkscape from public DIN thread data 2014-01-13 Olawlor cc-zero Knuckle threads Cross sections |