US PATENT SUBCLASS 470 / 197
.~ Nut or washer forming die

Current as of: June, 1999
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470 /   HD   THREADED, HEADED FASTENER, OR WASHER MAKING: PROCESS AND APPARATUS

183  DF  IMPLEMENT, E.G., DIE, ETC. {10}
197.~ Nut or washer forming die

DEFINITION

Classification: 470/197

Nut or washer forming die:

(under subclass 183) Subject matter wherein a fastener being formed is either: (a) provided with an internal helical ridge; (b) comprises an annular element adapted to be placed beneath the bearing surface of a bolt head, nut, or similar article.