Thread rolling and fastener
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Apr 5, 1988
Grant Date -
N/A
app pub date -
Jan 13, 1986
filing date -
Jan 13, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
This invention provides a fastener having a shank with a relatively abrupt transition from an unthreaded portion to a full thread dimension, the thread runout occupying no more than one pitch length of the thread in the axial dimension, and circumferentially extending no more than about one-fourth of the circumference of the thread at its pitch diameter. The counterbore of the nut is reduced in length in light of the short transition section of the shank. The threads are rolled on the shank by opposed dies having ridges complementary to the thread to be produced which run out at one edge of the die with spaced, generally symmetrical end walls which are relatively short axially of the ridges so that the full thread dimension is achieved abruptly.
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