| 摘要 |
PROBLEM TO BE SOLVED: To provide a tightening structure by a bolt and a nut capable of preventing powder coating from peeling off. SOLUTION: In this structure for tightening an object to be tightened by screw-fitting the bag-like nut coated with powder in the bolt 11, a plastic ring 15 having self-lubricity is provided between the bag-like nut 14 and the object to be tightened. Consequently, slide of a powder coated face of the nut 14 is improved, and it is possible for even a tightening torque of about 30 to 35 N.m to reach actual use strength in the case of a pipe joint of a water pipe. Moreover, there is an advantage that unevenness of its tightening torque is small. COPYRIGHT: (C)2003,JPO
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