| 摘要 |
PROBLEM TO BE SOLVED: To provide a fastening member and a fastening method capable of easily and certainly fastening plural metal thin plates, especially different kinds of metal thin plates, without causing damage or strength reduction of plate material or the fastening member. SOLUTION: When fastening a plurality thin plates A by use of the fastening member composed of combination of a drilling tapping screw 1 formed with a screw having a pitch smaller than a plate thickness of each the fastened thin plate A and a dish-shaped spring plate nut 2 having a plate thickness not less than the pitch and not having a threaded hole, a recessed face side of the nut 2 is faced to the lower face A2 of the plural thin plates A for the contacting and the holding, the drilling tapping screw 1 is screwed from the upper face A1 side of the plural thin plates A until the drilling tapping screw 1 penetrates the nut 2 and is fastened until a head part 1c of the drilling tapping screw 1 fastens the upper face A1 . Thereby, the thin plates A are fastened by pressing the nut 2 with deforming the nut 2 to the lower face A1 side.
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