Rotary drilling instrument
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United States of America Patent
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Oct 6, 1998
Grant Date -
N/A
app pub date -
Jan 31, 1996
filing date -
Feb 2, 1995
priority date (Note) -
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status (Latency Note)
Importance
Abstract
There is provided a rotary drilling instrument having uniform hardness, free from rust, and made of austenitic stainless steel possessing a hardness substantially the same as quenched steel or quenched martensitic stainless steel. The rotary drilling instrument is formed with a cutting section formed at one end of a body, a shank formed at the other end of the body, and a neck portion formed between the cutting section and the shank. The rotary drilling instrument is made of austenitic stainless steel having a fibriform organization elongated in a longitudinal direction and has a surface having a predetermined hardness.
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