Screwdriver, screwdriver bit or the like
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United States of America Patent
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-
Sep 21, 1999
Grant Date -
N/A
app pub date -
Sep 12, 1997
filing date -
Apr 8, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A screwdriver or screwdriver bit comprising a working end with radially extending engagement surfaces profiled in particular by machining or forming. A surface layer forming a working surface due to nitriting has a hardness of at least 900 HV 0.3 or 67-68 HRC and in an intermediate layer, lying between the hard surface layer and a softer region of a core of the working end, the hardness decreases with a hardness gradient of 1500 to 3000 HV 0.3/mm.
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