JP2001173629A - Fastener and fastening method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fastener capable of performing a fastening step and a bolt fastening step by a single step, in the case a second member of trim or the like is connected to a first member of body panel or the like by using a blind nut. SOLUTION: This fastener includes a bolt 2, a nut 5, and a washer 3, the nut 5 is a blind nut comprising an internal thread part 10, a pipe-shaped part 11 continued to the internal thread part, and a flange 13 formed in an end part of the pipe-shaped part. An external diameter of the pipe-shaped part 11 and the internal thread part 10 is smaller than a mounting hole 15 of a first member 14, a diameter of the flange 13 is larger than the first member mounting hole 15 and smaller than a mounting hole 18 of a second member 17, a diameter of the washer 3 is larger than the second member mounting hole 18, the washer 3 is interposed between a bolt head part 7 and a nut flange 13, a bolt screw part 6 is screwed to the nut internal thread part 10, and the washer 3 is assembled in a condition friction engaged with the nut flange 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fastener capable of connecting and fastening another member to a member such as a panel from one direction.

[0002]

2. Description of the Related Art A female thread portion, a tubular portion following the female thread portion,
A flange formed at an end of the tubular portion, the tubular portion being deformed in a radial direction in a state where the tubular portion is inserted into a hole of a member such as a panel, and fastened to the member by the deformed portion and the flange. Is well known, and is disclosed in, for example, Japanese Utility Model Laid-Open No. 59-146607. Since the blind nut can be operated from one direction, it is convenient for fastening to a member that is inaccessible to the back side, such as a body panel. A bolt can be screwed into the blind nut fastened to the attached member, and another member such as a trim can be attached to the member by screwing in the bolt.

[0003]

As described above, in order to connect a second member such as a trim to a first member such as a body panel using a blind nut, the blind nut must be connected to the first member.
Two steps are required: a step of fastening to the member and a step of tightening the bolt by screwing a bolt into the blind nut by positioning the second member on the fastened blind nut. Therefore, a time is required for the fastening operation, and in particular, an operation for positioning the second member on the fastened blind nut is time-consuming and troublesome.

Accordingly, an object of the present invention is to provide a first member such as a body panel with a second nut such as a trim using a blind nut.
An object of the present invention is to provide a fastener and a fastening method that can perform a fastening step and a bolt fastening step in one step in connecting members.

[0005]

According to the present invention, a first member having a mounting hole is provided with a second member having a mounting hole having a diameter larger than that of the first member. A fastener used for connecting and fastening, comprising a bolt, a nut, and a washer, wherein the nut has a female thread, a tubular part following the female thread, and a flange formed at an end of the tubular part. Wherein the outer diameter of the tubular portion and the female screw portion is smaller than the first member mounting hole, and the diameter of the flange is larger than the first member mounting hole and smaller than the second member mounting hole. The diameter of the washer is larger than the diameter of the second member mounting hole, the washer is clamped between the bolt head and the nut flange, the bolt screw portion is screwed into the nut female screw portion, and the washer is mounted on the nut flange. Friction Fastener is provided which is characterized in that is assembled in a state of. As described above, since the fastener is formed by assembling the washer and the bolt in advance on the nut which is the blind nut, the entire fastener is inserted into the mounting hole of the first member and the second member, and the bolt is tightened as it is. And fastening and bolting can be performed in one step.

According to the present invention, there is provided a fastening method for connecting and fastening a second member to a first member using the fastener, wherein the mounting hole of the first member is aligned with the mounting hole of the second member. Positioning the second member with respect to one member, inserting the nut tubular portion and the female screw portion of the fastener into the mounting holes of the first member and the second member, and connecting the flange to the mounting hole of the second member. And causing the washer to come into contact with the second member to project the female screw portion and the tubular portion from the first member, and fixing the washer that frictionally engages with the flange so as not to rotate, and fixing the washer. During this time, the bolt is screwed into the female thread so that the tubular portion of the nut is deformed radially outward, and the first portion is formed by the deformed tubular portion and the flange.
The member is clamped, and the second
Holding the member and connecting and fastening the second member to the first member. In this manner, the fastening and the bolting are performed in one step only by rotating the bolt while preventing the rotation of the washer, and the fastening operation can be completed easily and in a short time. Since the washer is preliminarily frictionally engaged with the nut flange, even if the bolt is rotated, the nut is not rotated by the washer, and the rotation of the bolt strongly pulls the nut flange toward the washer, so that the friction is reduced. The connection is stronger and the nut does not rotate with the bolt.

In the fastener according to the present invention, it is preferable that the hole of the washer is formed to have a slit extending in the radial direction and forming a sharp edge in the circumferential direction. Increase the frictional engagement force. Further, it is preferable that a projection is formed on a surface of the nut flange that is in contact with the washer or a surface of the washer that is in contact with the nut flange so as to prevent the relative rotation when the nut flange is in contact with the washer. Thereby, it is possible to enhance prevention of the co-rotation of the nut when tightening the bolt.

Further, in order to reinforce corotation prevention, it is preferable that the tubular portion of the nut is formed to have an outer shape that is accommodated in the non-round mounting hole of the first member so as not to rotate. Further, it is preferable that the outer shape of the flange of the nut is formed in a shape larger than the first member mounting hole and accommodated in the non-round mounting hole of the second member so as not to rotate. Thus, co-rotation can be prevented without assembling the washer so as to frictionally engage the nut flange.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described.
This will be described with reference to the drawings. FIG. 1 shows a fastener 1 according to a first embodiment of the present invention. The fastener 1 includes a metal bolt 2, a washer 3, and a metal nut 5. The bolt 2 is a conventional product and has a male screw portion 6 and a hexagonal head 7. The washer 3 may be made of metal or another material, and is made of a thin disk, and is used to press and support a second member such as a trim on a first member such as a body panel. A hole 9 is formed in the washer 3 at the center, through which the male screw portion 6 of the bolt 2 passes. The nut 5 is formed of a blind nut made of a metal integrally molded product. The nut 5 includes a female thread portion 10 and a thin-walled tubular portion 11 that extends upward from the female thread portion 10.
And a large-diameter flange 13 formed at the end of the tubular portion 11.
And is formed as a hollow cylindrical body. The tubular portion 11 is formed to be thinner than the female screw portion 10. When the female screw portion 10 is strongly pulled in the axial direction toward the flange 13, it can be deformed so as to protrude radially outward and buckle. In order to promote this buckling deformation, the tubular portion 11 may be made thinner or a slit extending in the longitudinal direction may be formed in the tubular portion 11. In the present invention, the fastener 1 has the bolt 2, the washer 3 and the nut 5 pre-assembled, and is assembled in a state where the second member such as trim is connected to the first member such as a panel for fastening. Used. More specifically, in the fastener 1, the bolt male screw portion 6 is screwed into the nut female screw portion 10, the washer 3 is sandwiched between the bolt head 7 and the nut flange 13, and the washer 3 is frictionally engaged with the nut flange 13. It is pre-assembled as an assembly to fit. In this case, the bolt 2 is preferably screwed firmly into the nut 5 just before the step of deforming the nut tubular portion 11, whereby the frictional engagement between the washer 3 and the nut flange 13 is increased, and 1 improves the unity,
Handling becomes easy, and the bolt and the washer toner do not fall apart.

The fastener 1 will be further described with reference to FIG. In FIG. 2A, a mounting member 15 such as a body panel, that is, a first member 14 is formed with a mounting hole 15 into which the fastener 1 is inserted. Also, a second member 17 such as a trim attached to the first member 14 is formed with a mounting hole 18 for inserting the fastener 1. And the second
The member mounting hole 18 has a larger diameter than the first member mounting hole 15. The fastener 1 includes a first member 14 and a second member 17.
Are connected and fastened. Therefore, the female thread portion 1 of the nut 5
The outer diameter of the tubular member 11 is smaller than that of the first member mounting hole 15 so that both the second member 17 and the first member 14 penetrate. The diameter of the nut flange 13 is formed larger than the first member mounting hole 15 but smaller than the second member mounting hole 18 so that the flange 13 is
It penetrates through the member mounting hole 18 but does not penetrate through the first member mounting hole 15, and can come into contact with the surface of the first member 15. Further, the diameter of the washer 3 is larger than the diameter of the second member mounting hole 18 so as to be in contact with the second member 17.

A method of connecting and fastening the second member 17 to the first member 14 using the fastener 1 will be described with reference to FIGS. First, in FIG. 2A, the second member 17 is aligned with the first member 14 such that the mounting hole 15 of the first member 14 is aligned with the mounting hole 18 of the second member 17. With the mounting holes aligned, insert the nut 5 of the fastener 1 into the mounting hole. The state after insertion is
This is illustrated in FIG. That is, the tubular portion 11 and the female screw portion 10 of the nut 5 of the fastener are inserted into both the mounting holes of the first member 14 and the second member 17. The nut flange 13 is housed in the mounting hole 18 of the second member 17. In the illustrated example, the nut flange 13 is in contact with the first member 14, but does not necessarily have to be in contact with the first member 14. Further, the washer 3 is connected to the second member 17.
Since the mounting hole 18 does not pass through, the second member 17 is brought into contact with the second member 17. On the other hand, the nut 5 has a female thread portion 10 and a tubular portion 11.
Are projected from the first member 14.

Next, FIG. 3A and FIG. 3B will be referred to. After inserting the fastener 1 into the first member 14 and the second member 17, the washer 3 is fixed so as not to rotate using a fastening tool, and is engaged with a driver part (not shown) with the bolt head 7. Turn the bolt head 7 times. That is,
In FIG. 3A, the washer fixing portion 19 of the fastening tool is shown.
Thus, the washer 3 is fixed so as not to rotate. On the other hand, a driver section for rotating the bolt head 7 extends from the fastening tool and fits into the bolt head 7, and the driver section rotates the bolt head 7. By this rotation, the bolt male screw part 6 is screwed into the nut female screw part 10, and the female screw part 10 is pulled up in the direction of the washer 3. In the fastener 1, the nut 5 does not rotate with the bolt 2 even when the bolt 2 is rotated. In the fastener 1, the washer 3 is sandwiched between the bolt head 7 and the nut flange 13, and the bolt male screw portion 6 is screwed into the nut female screw portion 10 so that the washer 3 frictionally engages with the nut flange 13 in advance. Since the nut flange 13 is fixed so as not to rotate by the washer fixing portion 19 of the fastening tool, the nut flange 13 is prevented from rotating and does not rotate together with the bolt 2. Further, the rotation of the bolt 2 pushes the washer 3 against the nut flange 13, and the washer 3 is more frictionally engaged with the nut flange 13. Since the rotation of the washer 3 is blocked by the fixing portion 19, the rotation of the nut flange 13 frictionally engaged with the washer 3 is also blocked, and the rotation of the nut 5 is also blocked. Therefore, the bolt 2 rotates with respect to the nut 5, and the male screw portion 6 is screwed into the nut female screw portion 10. The tightening torque of the bolt external thread portion 6 is so strong that the nut tubular portion 11 deforms radially outward, and as the screwing proceeds, the nut tubular portion 11 deforms in the radial direction and buckles. FIG. 3 shows a state in which the nut tubular portion 11 is buckled and deformed radially outward.
This is shown in (B). In FIG. 3B, the first member 14 is formed by the buckling-deformed tubular portion 21 and the flange 13.
Are clamped, whereby the fastener 1 is fixed to the first member 14. The washer 3 and the flange 13 pressed by the head 7 of the bolt 2 hold the second member 17. As a result, the second member 17 is connected to the first member 14 and fastened. As described above, in the present invention, the connection, the fastening, and the bolting of the first member and the second member can be performed in one step.

FIG. 4 shows a case where the second member 17 fastened to the first member 14 is exchanged or the like.
The operation of removing the member 17 is shown. To remove the second member 17, it is only necessary to rotate the bolt 2 in the loosening direction and remove the bolt 2 and the washer 3. In order to reattach the new second member or the repaired second member to the first member, align the mounting hole 18 of the second member 17 with the hole of the female screw portion 10 of the nut 5 fixed to the first member 14. After the positioning, the bolt 2 may be screwed into the nut 5 together with the washer 3. That is, the detaching operation and the reattachment can be extremely easily performed.

FIG. 5 shows a modification of the washer. In this washer 22, the hole 2 through which the bolt 5 passes is provided.
3 is formed in the shape of a petal with four radially extending slits 25. Each slit 25 is formed so as to extend in the radial direction and form a sharp edge in the circumferential direction. When the washer 22 is pressed against the nut flange 13 and frictionally engages, the slit 25 does not relatively move in the circumferential direction between the washer 22 and the nut flange 13 (that is, the washer 22 and the nut flange 1).
3 does not rotate relatively). Thereby, it is possible to strengthen the nut 5 from rotating together when the bolt 2 is screwed, that is, when the bolt 2 is tightened. FIGS. 6A and 6B show another example of strengthening prevention of co-rotation of the nut when tightening the bolt. In this example, a plurality of projections 25 extending outward in the radial direction are formed on the surface of the nut flange 13 in contact with the washer at intervals in the circumferential direction. The protrusion 26 enhances that the washer 3 and the nut flange 13 do not relatively move in the circumferential direction when frictionally engaged (the washer 3 and the nut flange 13 do not relatively rotate). Enhances the prevention of co-rotation of the nut. The number and shape of the protrusions are arbitrary as long as the co-rotational prevention is enhanced. Also, this projection is not a nut flange,
It may be provided on the surface of the washer 3 that is in contact with the nut flange, or may be provided on both opposite surfaces of the nut flange and the washer.

FIGS. 7A to 7D show modified examples of the nut in which the tubular portion of the nut is provided with a rotation preventing function.
The nut 27 is formed so that the tubular portion 29 has a square cross section instead of a perfect circular cross section as shown in FIG. The mounting hole of the first member to which the nut 27 is mounted is formed in a shape corresponding to the cross-sectional shape of the tubular portion 29. As described above, when the nut tubular portion 29 is inserted into the square mounting hole of the first member, the nut 27 cannot rotate around the axis, unlike the case of the perfect circular cross section, so that the bolt 27 is not screwed when the bolt is screwed. There is no co-rotation. Therefore, in this example, it is not always necessary to frictionally engage the washer with the nut flange when assembling the fastener. Of course, the fastener may be assembled with the washer frictionally engaged with the nut flange. In addition, the tubular portion 2
The cross-sectional shape of 9 is not limited to the illustrated rectangular cross section, and may be any non-circular cross section that prevents rotation, such as a hexagonal cross section or an elliptical cross section. In that case, the shape of the mounting hole of the first member is also formed accordingly. In any case, the tubular portion 29 of the nut 27 is formed into a shape that does not rotate when the tubular portion 29 is inserted into the mounting hole of the first member. Of course, the tubular part 29
May be formed in accordance with the non-round mounting hole of the first member. Further, the tubular portion 29 is formed so that the female screw portion 10 can be buckled when the bolt 2 is screwed into the nut.
It is formed weaker. The other parts of the nut 27 are the same as the nut 5 of FIG. Also, as shown in FIG. 8A, the fastener 30 using the nut 27 is such that the bolt male thread 6 is screwed into the nut female thread 10, and the bolt head 7 and the nut flange 1 are screwed.
3 is assembled in advance as an assembly in a state where the washer 3 is sandwiched therebetween.

The operation of connecting and fastening the second member 17 to the first member 14 by the fastener 30 using the nut 29 of FIG. 7 will be described with reference to FIGS. FIG. 8 (A)
As shown in the figure, the second member 1 is inserted into the mounting hole 31 of the first member 14.
The second member 17 is positioned with respect to the first member 14 so as to be aligned with the mounting hole 18 of FIG. As shown in FIG. 8B, the first member 17 is formed with a mounting hole 31 having a square cross section corresponding to the cross-sectional shape of the nut tubular portion 29. The shape of the mounting hole 31 can be any shape as long as the rotation of the nut 27 is prevented in cooperation with the nut tubular portion 29. 9, the nut tubular portion 29 and the female screw portion 10 of the fastener 30 are inserted into both mounting holes of the first member and the second member, so that the flange 13 is brought into contact with the first member 14 and the washer 3 is connected to the second member. The female screw portion 10 and the tubular portion 29 are made to protrude from the first member 14 in contact with the member 17. Next, the bolt 2 is screwed into the female screw portion 10 so that the nut tubular portion 29 is deformed radially outward (arrow 33). The tubular portion 29 of the nut 27 cooperates with the mounting hole 31 of the first member 14 and does not rotate with the bolt 2. Therefore, only the bolt 2 rotates, and the nut tubular portion 29 deforms and buckles so as to protrude radially outward. The first member 14 is sandwiched between the deformed tubular portion and the flange 13, and the flange 1
3 and the washer 3 sandwich the second member 17,
The second member is connected to the first member and fastened. in this way,
When the nut 27 is used, it is not necessary to fix the washer.

FIG. 10 shows an example in which the nut is provided with a rotation preventing function by deforming the outer shape of the nut flange. The deformed flange 34 is formed not in a perfect circle shape but in a square shape as shown in the figure. This shape is not limited to the square shape shown in the drawing, as in the case of the deformation of the nut tubular portion, and may be a non-circular shape such as a hexagonal shape or an elliptical shape for preventing rotation. When the flange is deformed in this way, the mounting hole of the second member 17 is
It is formed in a shape accommodating the flange according to the outer shape of the flange. In the illustrated example, the mounting hole of the second member 17 is formed as a square hole slightly larger than the flange 34. The flange 34 has a larger mounting hole so as not to penetrate the first member. Therefore,
When the fastener is inserted into the mounting holes of the first member and the second member,
The flange 34 faces the first member and is accommodated in the non-circular (square in the example shown) mounting hole of the second member so as not to rotate. Since the flange 34 cooperates with the mounting hole of the second member 17 to prevent the nut from rotating,
The nut does not rotate with the bolt 2. Therefore, only the bolt 2 rotates, and the nut tubular portion deforms and buckles so as to protrude outward in the radial direction, and the second member is connected to the first member and fastened. As described above, even when the nut having the deformed flange 34 is used, it is not necessary to fix the washer. Further, in assembling the fastener, the washer may be assembled in a state in which the washer is frictionally engaged with the nut flange, or the washer may be assembled in a state in which the washer is not frictionally engaged with the nut flange.

[0018]

According to the fastener of the present invention, the entire fastener can be inserted into the mounting holes of the first member and the second member and bolted as it is, and the fastening and bolting can be performed in one step. It can be carried out. The frictional engagement between the washer and the nut flange is further strengthened by the rotation of the bolt, so that the rotation of the bolt prevents the nut from rotating together and secures the connection. No special pressing operation is required. In addition, the cross-sectional shape of the tubular portion of the nut and the outer shape of the flange of the nut are formed in a shape cooperating with the mounting hole of the first member and the mounting hole of the second member, so that the nut rotates together with the bolt when rotating. Can be prevented, there is no need for frictional engagement between the washer and the nut flange when assembling the fastener, and it is not necessary to fix the washer so as not to rotate during the fastening operation.

[Brief description of the drawings]

FIG. 1 is a front half sectional view of a fastener according to the present invention.

2A and 2B show a state in which the fastener of FIG. 1 is disposed on a first member and a second member, and FIG. 2A shows a state before the second member is positioned on the first member and the fastener is inserted. FIG.
(B) is a figure which shows the state after arrange | positioning a fastener to a 1st member and a 2nd member.

3A and 3B show a state in which a second member is connected to a first member and fastened by the fastener of FIG. 1, and FIG. 3A is a diagram showing a state in which a bolt is rotated while a washer is pressed by a fastening tool. FIG. 7B is a diagram showing a state after fastening.

FIG. 4 is a view showing a state in which the second member is moved to the first position by rotating a bolt after fastening.
It is a figure which shows a mode that it removes from a member.

FIG. 5 is a plan view showing a modification of the washer.

FIG. 6 is a view showing a nut with a deformed flange;
(A) is a top view of a nut, (B) is a front half sectional view of a nut.

FIGS. 7A and 7B are diagrams showing modified examples of the nut in which the tubular portion has a square cross section, wherein FIG. 7A is a plan view of the nut, FIG. 7B is a front view of the nut, and FIG. (D) is a cross-sectional view taken along the line AA in (C).

8A is a view showing a state before the first member and the second member are connected by a fastener using the nut of FIG. 7; FIG.
FIG. 5B is a diagram showing a state before the fastener is inserted after the second member is positioned on the first member, and FIG.
It is a top view which shows the part of a mounting hole.

9 is a diagram showing an operation of connecting a second member to a first member using the fastener of FIG. 8;

FIG. 10 is a plan view of a nut showing a modification of the flange of the nut.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fastener 2 Bolt 3 Washer 5 Nut (Blind nut) 6 Male screw part 7 Head 9 Hole 10 Female screw part 11 Tubular part 13 Flange 14 First member 15 Mounting hole 17 Second member 18 Mounting hole 19 Washer fixing part 21 Tubular part Modification Example 22 Deformation washer 25 Slit 26 Projection 27 Deformation nut 29 Tubular part 30 Fastener 34 Nut flange

Claims (7)

[Claims] 1. A fastener used for connecting and fastening a first member having a mounting hole to a second member having a mounting hole larger in diameter than the mounting hole of the first member, comprising: a bolt, a nut, and a washer. Wherein the nut is a blind nut comprising a female thread portion, a tubular portion following the female thread portion, and a flange formed at an end of the tubular portion, and an outer diameter of the tubular portion and the female thread portion is The diameter of the flange is smaller than the diameter of the first member mounting hole and smaller than the diameter of the second member mounting hole, the diameter of the washer is larger than the diameter of the second member mounting hole, A fastener characterized in that a washer is sandwiched between a bolt head and a nut flange, and the bolt screw portion is screwed into the female nut portion so that the washer is frictionally engaged with the nut flange. 2. The fastener of claim 1, wherein the hole in the washer is a non-circular hole formed with a slit extending radially and forming a sharp edge in the circumferential direction. And fasteners. 3. The fastener according to claim 1, wherein a surface of the nut flange that is in contact with the washer or a surface of the washer that is in contact with the nut flange is a projection that enhances prevention of relative rotation when the nut flange and the washer are in contact. Wherein the fastener is formed. 4. A first member having a mounting hole and a second member having a mounting hole having a diameter larger than that of the first member are connected to the first member having the mounting hole by using the fastener according to claim 1. A step of aligning the second member with the first member such that the mounting hole of the first member is aligned with the mounting hole of the second member; and a nut tubular portion of the fastener. And the female screw part is inserted into both mounting holes of the first member and the second member, the flange is received in the mounting hole of the second member, and the washer is brought into contact with the second member. A step of projecting from one member and fixing a washer that frictionally engages the flange so as not to rotate, and during the fixing of the washer, the bolt is attached to the female thread so that the tubular portion of the nut deforms radially outward. Screwing, its deformed tubular part and flange A first member being held by the first member, a second member being held by the flange and the washer, and connecting and fastening the second member to the first member. 5. A fastener used for connecting and fastening a second member to a first member, the fastener comprising a bolt, a nut, and a washer, wherein the nut has an internal thread portion and a tubular portion following the internal thread portion. A blind nut comprising a flange formed at an end of the tubular portion, wherein the tubular portion is formed with an outer shape that is accommodated in the non-round mounting hole of the first member so as not to rotate. The diameter of the flange is larger than the first member mounting hole and smaller than the second member mounting hole, and the diameter of the washer is larger than the second member mounting hole. A fastener characterized in that a washer is clamped and a bolt screw portion is screwed into a nut female screw portion. 6. A fastener used to connect and fasten a second member to a first member, the fastener including a bolt, a nut, and a washer, wherein the nut has an internal thread portion and a tubular portion following the internal thread portion. A blind nut comprising a flange formed at an end of the tubular portion, wherein the outer diameter of the tubular portion and the female screw portion is smaller than a mounting hole of the first member, and the outer shape of the flange is a first member. It is formed in a shape larger than the mounting hole and housed so as not to rotate in the non-round mounting hole of the second member,
The washer is larger than the second member mounting hole,
A fastener characterized in that a washer is sandwiched between a bolt head and a nut flange, and a bolt screw portion is screwed into a nut female screw portion. 7. A fastening method for connecting and fastening a second member to a first member using the fastener according to claim 5 or 8, wherein the mounting hole of the first member is connected to the mounting hole of the second member. Positioning the second member with respect to the first member so as to be aligned; inserting the nut tubular portion and the female screw portion of the fastener into the mounting holes of the first member and the second member; Causing the female screw portion and the tubular portion to protrude from the first member by allowing the washer to come into contact with the second member and causing the female screw portion and the tubular portion to protrude from the first member; and deforming the bolt so that the tubular portion of the nut is radially outward. Screwing into the female screw portion so that the first member is held between the deformed tubular portion and the flange, the second member is held between the flange and the washer, and the second member is connected to the first member and fastened. It consists of Signing method of fastening.