| 摘要 |
PROBLEM TO BE SOLVED: To reduce plastic deformation of a hexagonal hole while ensuring the strength by reducing a drive angle to improve drive efficiency. SOLUTION: This turning tool has six corner parts 2 having a round chamfered shape and six side faces 3 formed between each corner part 2 and is formed so as to be inserted into the hexagonal hole Ba. The side faces 3 every one side face among the six side faces 3 are formed into substantially flat faces, the other side faces 3 are formed into recessed and projecting faces having a crest face 3a in an intermediate part between the corner parts 2 and a trough face 3b between the crest face 3a and both corner parts 2, and a vertex of the crest face 3a is positioned on a side line H which becomes a common tangential line of the corner parts 2? or on a tool center P side more than the side line.
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