US PATENT SUBCLASS 411 / 371.2
.~ Washer adjacent head and having a particular shape (e.g., dished) or composition


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411 /   HD   EXPANDED, THREADED, DRIVEN, HEADED, TOOL-DEFORMED, OR LOCKED-THREADED FASTENER

337  DF  HEADED FASTENER ELEMENT WITH NUT, WASHER, SECURING MEANS OR CAP {12}
371.2.~ Washer adjacent head and having a particular shape (e.g., dished) or composition {1}
372  DF  .~.~> And separate attaching or retaining means