Tapping screw
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United States of America Patent
Stats
-
Jan 6, 2004
Grant Date -
N/A
app pub date -
Dec 20, 2001
filing date -
Jun 28, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention is directed to provide a tapping screw for a soft material having a sufficiently large stripping torque compared to a driving torque and an increased tolerance of a fastening torque, and characterized in that it has threads each having a leading flank and a following flank, the leading flank being designed to be steeper than the following flank, that an R is imparted to a crest of each thread on the following flank side, that an R is also imparted to each flank at a portion contiguous to a root thereof and that the former R and the latter R being designed to connect smoothly to each other at the root.
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