| 摘要 |
An object is to provide a rotary tool and the like, in which an occurrence of plastic deformation is suppressed even when a great rotational torque is exerted. A rotary tool B includes a cutting part 14 at its distal end portion and a shank 11 at its proximal end portion. The cutting part 14 has cutting edges that are arranged in a manner to face forward, and the shank 11 is to be inserted and attached into an insertion hole 1 of an arbor A. The shank 11 includes: engagement recesses 15 which come into engagement with locking members 2 which are provided in the arbor in such a manner as to be protrudable inwardly from the insertion hole 1; and passage recesses 18 which allow the locking members to be guided into the engagement recesses 15. The rotary tool B is configured such that falling off of the rotary tool B from the arbor A is prevented. A groove 16 is formed in the shank 11 at a portion where an engagement recess 15 is either formed or not formed. The groove 16 comes into engagement by surface contact with a protrusion 3 formed in the insertion hole 1 of the arbor A.
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