| 摘要 |
PROBLEM TO BE SOLVED: To obtain a screw fastening structure suppressing or preventing corotation of a fastening member and a washer without forming irregularities on the washer.SOLUTION: In a washer 26, an equivalent friction diameter (Db2) at a contacting part 34A with a fuel tank band 10 is set larger than an equivalent friction diameter (Db1) at a contacting part 32A with a flange part 22A of a flange bolt 22. With this, fastening torque (T1) at the contacting part 32A of the washer 26 and fastening torque (T2) at the contacting part 34A of the washer 26 are in a relationship of T1<T2. Accordingly, when fastening the fuel tank band 10 to a body 11, corotation of the flange bolt 22 and the washer 26 can be suppressed and prevented, and assembly workability is improved. |
