| 摘要 |
A rotary cutting tool including a cylindrical main body which is partially coated with a hard coating, so as to include a coated portion and a non-coated portion that is not coated with the hard coating. The cylindrical main body has: (a) at least one flute each of which extends from an axially distal end of the main body portion to an axially proximal end of the main body portion, and (b) at least one land each of which is provided by a peripheral portion of the cylindrical main body not cut away by the flute or flutes. The coated portion is provided by at least an outer circumferential surface of each land, while the non-coated portion is provided by at least a rear-side portion of a flute surface of each flute as viewed in the predetermined rotating direction.
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