DIFF Subgroup
F16B 25/04 by a slicing and material displacing action, e.g. wood screws with sharp thread crests
Introduced: January 1985
Full Title
Screws that form threads in the body into which they are screwed, e.g. wood screws, self-tapping screws > by a slicing and material displacing action, e.g. wood screws with sharp thread crests