| 摘要 |
PROBLEM TO BE SOLVED: To provide a joint tube material capable of improving the workability of nut tightening and preventing damage of a joint body. SOLUTION: The friction torque received by a first end surface part 32 of a control ring 30 from the peripheral edge part 25 of a female screw hole 21 of a nut member 20 when the nut member 20 is tightened is larger than the friction torque received by a second end surface part 34 of the control ring 30 from a stopper part 17 of the joint body 10, and the nut member 20 and the control ring 30 securely rotate together at the final stage of tightening of the nut member 20. In this way, an initial tightening position of the nut member 20 is properly determined. COPYRIGHT: (C)2004,JPO
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