It is the numerical method of specifying a single point cutting tool by its various angles and nose radius standardized by the American Standards Association.
E.g. A single point tool specified as
8-14-6-6-6-15-4 means
Back rake angle- 8⁰
Side rake angle- 14⁰
End relief angle- 6⁰
Side relief angle- 6⁰
End cutting edge angle- 6⁰
Side cutting edge angle- 15⁰
Nose radius- 4mm
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