STEP DRILL
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United States of America Patent
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Issued Date -
Mar 27, 2025
app pub date -
Jun 28, 2024
filing date -
Jun 28, 2024
priority date (Note) -
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status (Latency Note)
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Abstract
A step drill includes a stepped cone formed with a tip and a bottom, a shank extending from the bottom, and steps formed between the tip and the bottom. The stepped cone includes a transitional portion formed on one of the steps. There is a first length between the transitional portion and the tip. There is a second length between the transitional portion and the bottom. The stepped cone includes four helical grooves. The first and second helical grooves are located opposite to each other. The third and fourth helical grooves are located to each other. The first and second helical grooves extend from the tip. The third and fourth helical grooves extend from the transitional portion to the bottom.
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