| 摘要 |
PURPOSE: To provide durability against interference and make torque control possible by arranging a drive coupling means frangible upon application of a torque in excess of a predetermined torque between a threaded portion and a tool engageable portion. CONSTITUTION: A threaded portion is provided by threading a bore 23 in the internal portion 3 of a soft metal, and engaged with the external portion 2 having an engagement surface 4 for engaging with a tool by the spline 7 on the outer peripheral portion. The same structure may be adopted with respect to bolt and screw. By this way, it is suitable for enhancing durability against interference and controlling torque in practice.
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