| 摘要 |
This invention provides a clamping nut which prevents, at the time of rotation of the clamping nut, a fastening force that is imparted in the radial direction of the clamping nut towards the inside of the clamping nut, from operating on a converting part formed on the inner surface of the clamping nut, thereby enhancing rotation efficiency and making it possible to securely clamp a clamp object member. This invention also provides a tool holder with the above-described clamping nut, and a spanner for the fastening of the clamping nut. The clamping nut has an annular groove which takes the form of an annular shape over its outer surface in at least a section of the area on its outer surface that corresponds to a female screw, and which will not come in contact with the spanner. Alternatively, the spanner has a holding part for holding the outer surface of the clamping nut, and this holding part includes a non-contact area which takes the form of an annular shape along the holding part and which will not come in contact with at least a section of the area that corresponds to the female screw of the clamping nut.
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