US PATENT SUBCLASS 411 / 399
.~ Head having counter-sinking means

Current as of: June, 1999
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411 /   HD   EXPANDED, THREADED, DRIVEN, HEADED, TOOL-DEFORMED, OR LOCKED-THREADED FASTENER

378  DF  EXTERNALLY THREADED FASTENER ELEMENT, E.G., BOLT, SCREW, ETC. {16}
399.~ Head having counter-sinking means

DEFINITION

Classification: 411/399

Head having counter-sinking means:

(under subclass 378) Subject matter wherein the fastening means has a transverse projection, i.e., a head and further wherein the head includes means adapted to cut away the material into which the fastening means is driven so that the head may be sunk flush with or below the surface of the material.