JP3228701U - Locknut - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a caulking nut having a structure capable of improving production efficiency. SOLUTION: A caulking nut 1 has a caulking fixing portion 4 formed on one end side in the axial direction of a nut main body 2, and the caulking fixing portion 4 is engaged with a nut mounting hole 7 formed in a mounted member 5. It is caulked and fixed to the attached member 5. In the nut body 2, the screw hole 6 penetrates along the central axis CL of the nut body 2 from one end side in the axial direction of the nut body 2 to the other end side in the axial direction of the nut body 2, and the axial direction of the nut body 2 and the like. The cap 3 is welded on the end side and around the screw hole 6. The cap 3 is formed so as to cover the opening on the other end side in the axial direction of the screw hole 6. On a virtual plane orthogonal to the central axis CL of the nut body 2, if the direction radially extending from the central axis CL is the radial direction, the end surface 17 on the other end side of the nut body 2 in the axial direction and outside the radial direction of the cap 3 At the position on the side side, a pressure member contact surface 20 parallel to the virtual plane is formed. [Selection diagram] Fig. 4

Description

The present invention relates to a caulking nut that is caulked and fixed to a plate-shaped member (attached member) that cannot be machined with a screw hole (female screw), and a screw (for example, a round flat head screw) or a bolt is screwed. It is a thing.

Conventionally, a caulking nut is caulked and fixed to a plate-shaped member (a member to be attached such as a steel plate or an aluminum plate) that cannot be machined with a screw hole, and the caulking nut and a screw (round flat machine screw, etc.) screwed into the caulking nut. Alternatively, there is known a technique of tightening and fixing other structures (electronic component support panel, printed substrate, etc.) to a plate-shaped member with bolts.

FIG. 7 shows such a caulking nut 101. As shown in FIG. 7, the caulking nut 101 has a substantially cylindrical shape in which a screw hole (female screw) 102 is formed, and a caulking fixing portion 104 is formed on one end side of the nut main body portion 103. The caulking fixing portion 104 has a pilot portion 107 engaged with the nut mounting hole 106 of the plate-shaped mounted member 105 and a press-fit fixing portion 108 press-fitted into the peripheral edge of the nut mounting hole 106 of the mounted member 105. It has (see FIG. 8 (a)). Of these, the pilot portion 107 has a substantially cylindrical shape with a reverse taper that engages with the nut mounting hole 106 of the mounted member 105 with a slight gap, and the axial tip surface (left end surface in FIG. 7B) 110. The outer diameter dimension is the largest, and the outer diameter dimension gradually decreases toward the root side (the right side along the central axis CL in FIG. 7B) (undercut). The press-fit fixing portion 108 is located adjacent to the pilot portion 107, and its outer diameter dimension is larger than the outer diameter dimension of the pilot portion 107 and the size of the hole 106 of the mounted member 105, and the outer diameter dimension of the nut body portion 103. A substantially triangular groove 111 is continuously formed along the entire circumference (see FIG. 7A). Further, the caulking nut 101 is formed so that the length of the caulking fixing portion 104 along the central axis CL is slightly shorter than the plate thickness dimension of the attached member 105. The groove 111 is a serration groove extending in the direction along the central axis CL.

In the caulking nut 101 having such a shape, as shown in FIG. 8A, the pilot portion 107 is inserted into the nut mounting hole 106 of the mounted member 105, and the end surface 112 of the press-fit fixing portion 108 is inserted into the mounted member 105. Pressurized between the backing metal (lower mold) 115 and the punch (upper mold) 116 pressed against the front surface 113 and pressed against the back surface 114 of the attached member 105. As a result, as shown in FIG. 8B, the caulking nut 101 is a part (base material) of the attached member 105 in which the caulking fixing portion 104 is press-fitted into the attached member 105 and pressed by the press-fit fixing portion 108. Plasticly flows so as to fill the gap between the reverse tapered pilot portion 107 and the nut mounting hole 106, and a part of the mounted member 105 meshes tightly with the substantially triangular groove 111 of the press-fit fixing portion 108 (FIG. 8), the end surface 110 of the pilot portion 107 is caulked and fixed to the attached member 105 so as not to protrude from the back surface 114 of the attached member 105. In the caulking nut 101 that has been caulked and fixed to the attached member 105 in this way, the reverse tapered pilot portion 107 exerts a function of preventing the attached member 105 from coming off, and the press-fit fixing portion 108 has a substantially triangular groove 111. Is designed to exert a detent function with respect to the attached member 105 (see FIG. 8B). Then, another structure (for example, a printed circuit board or an electronic component support panel) is closely arranged on the attached member 105 to which the caulking nut 101 is caulked and fixed so that the structure is caulked. It is tightened and fixed to the attached member 105 with a screw or a bolt screwed into a nut (see Patent Document 1).

Utility Model Registration No. 3157701 (see in particular, FIGS. 6 and 7)

In the conventional caulking nut 101 shown in FIG. 7, since the screw hole 102 was a through hole, it was possible to process it by cold heading. However, in the conventional caulking nut 101, the press-fitting and fixing portion 108 is formed to have a larger outer diameter than the pilot portion 107, and the nut body 103 is formed to have a larger outer diameter than the press-fitting and fixing portion 108. Since the outer diameter dimension is changed in a stepwise manner along the axis CL in three steps, if the screw hole 102 is not a through hole (in the case of a bottomed screw hole 102), cold heading is performed. Was difficult (it was difficult to plastically flow the material accurately in the die) and it was formed by cutting. As described above, the caulking nut formed by cutting has a problem that the processing time is long and the production efficiency is low as compared with the case where the caulking nut is formed by plastic working such as cold heading.

Therefore, an object of the present invention is to provide a caulking nut having a structure capable of improving production efficiency.

In the present invention, the caulked fixing portion 4 is formed on one end side in the axial direction of the nut body 2, and the caulked fixing portion 4 is engaged with the nut mounting hole 7 formed in the mounted member 5. It relates to a caulking nut 1 which is to be caulked and fixed. In the caulking nut 1 of the present invention, in the nut body 2, the screw hole 6 extends from one end side in the axial direction of the nut body 2 to the other end side in the axial direction of the nut body 2 along the central axis CL of the nut body 2. The cap 3 is welded to the other end of the nut body 2 in the axial direction and around the screw hole 6. The cap 3 is formed in a shape that covers the opening on the other end side in the axial direction of the screw hole 6. Then, on the virtual plane orthogonal to the central axis CL, if the direction radially extending from the central axis CL is the radial direction, the end surface 17 on the other end side in the axial direction of the nut body 2 and the diameter of the cap 3 is larger than that of the cap 3. At a position on the outer side in the direction, a pressurizing member contact surface 20 that contacts the pressurizing member 18 that pressurizes the nut body 2 toward the attached member 5 is formed. The pressure member contact surface 20 is parallel to the virtual plane.

Since the caulking nut according to the present invention has a structure in which a cap having a shape covering one opening of the screw hole is welded to the nut body through which the screw hole penetrates, the nut body and the cap are separated by plastic working. It can be easily integrated after being formed in, and it is possible to improve the production efficiency as compared with the case where the whole is formed by cutting.

It is a figure which shows the caulking nut which concerns on this invention. It is a figure which shows the nut main body which comprises the caulking nut which concerns on this invention. It is a figure which shows the cap which comprises the caulking nut which concerns on this invention. FIG. 4A is a diagram showing a state before the caulking nut according to the present invention is caulked and fixed to the attached member, and FIG. 4B is a diagram after the caulking nut according to the present invention is caulked and fixed to the attached member. It is a figure which shows the state of. FIG. 5A is a diagram showing a modified example 1 of the caulking nut according to the present invention, and FIG. 5B is a diagram showing a modified example 2 of the caulking nut according to the present invention. FIG. 6A is a cross-sectional view showing a modified example 4 of the caulking nut according to the present invention, and FIG. 6B is a cross-sectional view showing a modified example 5 of the caulking nut according to the present invention. FIG. 7A is a front view of the caulking nut according to the conventional example, and FIG. 7B is a side view showing a part of the caulking nut according to the conventional example by breaking. FIG. 8A is a diagram showing a state before the caulking nut according to the conventional example is caulked and fixed to the attached member, and FIG. 8B is a diagram after caulking and fixing the caulking nut according to the conventional example to the attached member. It is a figure which shows the state of.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a diagram showing a caulking nut 1 according to the present invention. Further, FIG. 2 is a diagram showing a nut body 2 constituting the caulking nut 1 according to the present invention. Further, FIG. 3 is a diagram showing a cap 3 constituting the caulking nut 1 according to the present invention.
1 (a) is a front view of the caulking nut 1, FIG. 1 (b) is a side view of the caulking nut 1, and FIG. 1 (c) is along the A1-A1 line of FIG. 1 (a). It is a cross-sectional view of the caulking nut 1 which is cut and shown, and FIG. 1 (d) is a rear view of the caulking nut 1.
2 (a) is a front view of the nut body 2, FIG. 2 (b) is a side view of the nut body 2, and FIG. 2 (c) is along the A2-A2 line of FIG. 2 (a). FIG. 2D is a cross-sectional view of the nut body 2 which is cut and shown, and FIG. 2D is a rear view of the nut body 2.
Further, FIG. 3 (a) is a front view of the cap 3, FIG. 3 (b) is a side view of the cap 3, and FIG. 3 (c) is cut along the lines A3-A3 of FIG. 3 (a). 3 (d) is a rear view of the cap 3. FIG.

As shown in FIGS. 1 to 3, the caulking nut 1 according to the present invention has a cylindrical nut body 2 as if a round bar was cut to a predetermined length, and a bottomed tubular shape welded to the nut body 2. Has a cap 3 and. The nut body 2 and the cap 3 are both made of a metal material (for example, stainless steel, iron-based metal, etc.).

(Nut body)
As shown in FIGS. 1 and 2, the nut body 2 is formed with a caulking fixing portion 4 on one end side in the axial direction (the left end side along the central axis CL in FIG. 1B), and the caulking fixing portion 4 is formed. It is designed to be caulked and fixed to the attached member (metal panel of the housing, etc.) 5 (see FIG. 4). Further, in the nut body 2, the screw hole 6 is from one end side in the axial direction of the nut body 2 along the central axis CL to the other end side in the axial direction of the nut body 2 (right end side along the central axis CL in FIG. 1B). ) Penetrates. A cap 3 is welded to the other end of the nut body 2 in the axial direction and around the screw hole 6. In the present embodiment, assuming that the direction along the central axis CL of the nut body 2 is the axial direction, the outer peripheral shape of the nut body 2 on the virtual plane orthogonal to the axial direction is circular. Further, in the present embodiment, the radial direction is the direction extending radially from the central axis CL on the virtual plane orthogonal to the central axis CL of the nut body 2.

As shown in FIGS. 1, 2, and 4, the caulking fixing portion 4 has a substantially cylindrical pilot portion 8 that is engaged with a nut mounting hole 7 of the mounted member 5, and a side surface 10 of the mounted member 5. It has a press-fitting and fixing portion 11 which is press-fitted and fixed to. The caulking fixing portion 4 is formed so that the axial length (length along the central axis CL) L1 is equal to the plate thickness t of the mounted member 5 or shorter than the plate thickness t of the mounted member 5. Has been done. Further, the caulking fixing portion 4 is located inward in the radial direction with respect to the outer peripheral surface 2a of the nut main body 2.

As shown in FIGS. 1, 2, and 4, the pilot portion 8 has a circular outer shape on the front side, and the axial tip surface 13 side (the left end of FIGS. 1 (c) and 2 (c)). The outer diameter of the side) is formed so as to engage with the nut mounting hole 7 of the mounted member 5 (see FIG. 4A), and the axial length L2 is from the plate thickness t of the mounted member 5. Is also formed to be short. Further, the pilot portion 8 has a reverse taper that gradually reduces the external dimensions as the outer peripheral surface 12 is separated from the axial tip surface 13 side (the left end surface side of FIGS. 1 (c) and 2 (c)) along the central axis CL. It is formed in a shape. Then, when the press-fitting fixing portion 11 is press-fitted into the mounted member 5, the pilot portion 8 is a part of the mounted member 5 (covered) in the gap between the outer peripheral surface 12 and the inner peripheral surface 7a of the nut mounting hole 7. The plastically flowed portion of the mounting member 5) is accommodated and fixed to the mounted member 5 in a state of being prevented from coming off (see FIG. 4B). Further, the pilot portion 8 has a screw hole 6 opened in the center of the axial tip surface 13. The screw hole 6 is formed by cutting a female screw with a tap into a screw pilot hole 14 formed when the nut body 2 is plastically worked by cold heading, and is a shaft portion such as a round flat head screw. The screw (not shown) or the screw on the shaft of the bolt (not shown) is screwed. The pilot portion 8 has a slightly cylindrical outer peripheral surface extending along the axial direction at the tip in the axial direction, but is not limited to this (instead of the cylindrical outer peripheral surface or a cylindrical outer peripheral surface). In addition to the surface), R chamfering or C chamfering may be performed.

As shown in FIGS. 1, 2, and 4, the press-fitting and fixing portion 11 is integrally formed in a ring shape on the outer peripheral side of the pilot portion 8 and has a triangular columnar shape (the shape seen from the front side is triangular). A plurality of the portions 15 are continuously formed along the circumferential direction, and a triangular columnar (triangular shape when viewed from the front side) protrusions 16 are formed between the adjacent recesses 15 and 15. As shown in FIG. 4B, the press-fitting and fixing portion 11 is press-fitted into the attached member 5 to form a part of the attached member 5 (a portion of the attached member 5 that has been plastically flowed) into a recess 15. It is housed inside and fixed to the attached member 5 in a non-rotating state (see FIG. 4B).

The nut body 2 having the above-mentioned shape is formed by cold heading (plastic working) in its entire shape including the screw pilot hole 14, except for thread cutting by tapping. Then, when the cap 3 is welded to the end surface 17 on the other end side in the axial direction, the nut body 2 is located at a position on the radial outer side of the cap 3 (the nut body 2 is attached to the member 5). The pressure member contact surface 20 that comes into surface contact with the punch or the like that pressurizes toward the center axis CL is formed as a ring-shaped plane parallel to the virtual plane orthogonal to the central axis CL. The pressure member contact surface 20 has a circular outer shape on a virtual plane orthogonal to the central axis CL, and its outer diameter is larger than the maximum diameter of the press-fitting fixing portion 11 (nut body). (Although it is substantially the same diameter as the maximum diameter of 2), it is preferable that the outer diameter dimension is at least the same diameter as the maximum diameter of the press-fit fixing portion 11. Although the nut body 2 has an example in which the outer shape seen from the front side is circular (see FIGS. 1 (a) and 2 (a)), the nut body 2 is not limited to this, and the outer shape seen from the front side is not limited to this. It may have a polygonal shape such as a hexagon, or may be changed to a shape according to the usage mode.

(cap)
As shown in FIGS. 1, 3, and 4, the cap 3 is a bottomed tubular body formed to have a constant wall thickness, and the bottom portion 3a is formed in a hemispherical shape and is orthogonal to the central axis CL. It is formed so that the cross-sectional shape on the virtual plane is circular. The cap 3 has an opening end welded to the end surface 17 on the other end side in the axial direction of the nut body 2 and the peripheral edge of the opening on the other end side in the axial direction of the screw hole 6 It is designed to cover the opening. The outer diameter of the cap 3 is determined by setting the area of the end face 17 of the nut body 2 (the area of the end face 17 before welding the cap 3) to S1 and after welding the cap 3 to the end face 17 of the nut body 2. Assuming that the exposed area of the end face 17 (the area of the end face 17 that is not covered by the cap 3 and the area of the pressure member contact surface 20) is S2, the ratio of S2 to S1 (S2 / S1) is It is determined to be about 50% (45% -65%). As a result of determining the configuration of the cap 3 in this way, the area of the pressure member contact surface 20 (with the nut body 2) capable of stably applying the pressure load of the pressure member 18 to the nut body 2 The contact area with the pressurizing member 18) is secured. In this embodiment, the case where S2 / S1 is about 50% is illustrated, but the present invention is not limited to this, and the value of S2 / S1 is about 50% as long as the nut body 2 can be crimped and fixed to the attached member 5. It may be shifted from the range of (45% to 65%).

Such a cap 3 is formed by plastic working (for example, pressing) a thin plate of a metal material (for example, stainless steel, iron-based metal, etc.).

(Attached state of caulking nut)
FIG. 4A is a diagram showing a state before the caulking nut 1 according to the present invention is caulked and fixed to the attached member 5, and FIG. 4B is a diagram showing a state before the caulking nut 1 according to the present invention is caulked and fixed to the attached member 5. It is a figure which shows the state after caulking and fixing.

First, as shown in FIG. 4A, the pilot portion 8 of the caulking nut 1 is inserted into the nut mounting hole 7 of the mounted member 5 and caulked as a preliminary step for caulking and fixing the caulking nut 1 to the mounted member 5. The tip surface 11a of the press-fitting fixing portion 11 of the nut 1 is abutted against the surface (side surface 10) of the attached member 5. Then, a backing plate 22 having a diameter larger than the outer diameter of the caulking nut 1 is abutted against the back surface 21 side of the attached member 5 so as to come into surface contact with the back surface 21 of the attached member 5. Further, on the end surface 17 side of the nut body 2 (the other end side in the axial direction of the nut body 2), a cylindrical pressure member 18 that applies a caulking force to the caulking nut 1 faces the cap 3 and is fitted to the cap 3. It is placed in the state of being. Here, the pressure member 18 has a diameter larger than the outer diameter of the nut body 2 and the nut body 2 so that the entire surface of the pressure member contact surface 20 of the nut body 2 can be pressed toward the attached member 5. It has a flat surface parallel to the end surface 17 of the.

Next, as shown in FIG. 4B, a caulking force for pushing the caulking nut 1 toward the attached member 5 is applied to the pressurizing member 18, and the press-fitting fixing portion 11 of the caulking nut 1 is hidden by the attached member 5. Until then, the press-fitting and fixing portion 11 of the caulking nut 1 is pushed into the attached member 5 by the caulking force of the pressurizing member 18. Then, when the press-fitting and fixing portion 11 of the caulking nut 1 is pushed into the attached member 5, a part of the attached member 5 is plastically flowed and accommodated in the recess 15 of the press-fitting and fixing portion 11, and the attached member is accommodated. A part of 5 is plastically flowed and is accommodated in the gap (reverse tapered gap) between the outer peripheral surface 12 of the pilot portion 8 and the inner peripheral surface 7a of the nut mounting hole 7 without a gap. As a result, the caulking nut 1 is fixed to the attached member 5 in a state of being prevented from rotating and being prevented from coming off.

(Effect of this embodiment)
Since the caulking nut 1 according to the present embodiment as described above has a structure in which a cap 3 having a shape covering one opening of the screw hole 6 is welded to the nut body 2 through which the screw hole 6 penetrates. The nut body 2 and the cap 3 can be easily integrated after being formed separately by plastic working, and the production efficiency can be improved as compared with the case where the whole is formed by cutting.

Further, when the caulking nut 1 according to the present embodiment is used by being caulked and fixed to the attached member 5 of the housing for accommodating electronic parts, one end of the screw hole 6 is closed, so that the screw hole is a screw hole. It is possible to prevent metal powder, dust, etc. attached to the screw or bolt screwed into 6 from entering the inside of the housing through the screw hole 6.

(Modification example 1)
FIG. 5A is a front view showing a modified example 1 of the caulking nut 1 according to the present invention. In the caulking nut 1 according to the present modification 1 shown in FIG. 5A, the shape of the recess 15 (the shape seen from the front side) of the press-fit fixing portion 11 is an arc shape, and the recesses 15 and 15 adjacent to each other. A substantially triangular protrusion 16 is formed between the two. The caulking nut 1 according to the present modification 1 is press-fitted and fixed in the same manner as the caulking nut 1 shown in FIG. 1 in which the shape of the recess 15 (the shape seen from the front side) of the press-fit fixing portion 11 is triangular. When the portion 11 is press-fitted into the attached member 5, the press-fitting fixing portion 11 is fixed to the attached member 5 in a detented state.

(Modification 2)
FIG. 5B is a front view showing a modified example 2 of the caulking nut 1 according to the present invention. The caulking nut 1 according to the present modification 2 shown in FIG. 5B is 6 along the circumferential direction of the press-fit fixing portion 11 so that the outer shape of the press-fit fixing portion 11 as viewed from the front side is a hexagonal shape. The recess 15 of the portion is formed. The caulking nut 1 according to the present modification 2 is press-fitted and fixed in the same manner as the caulking nut 1 shown in FIG. 1 in which the shape of the recess 15 (the shape seen from the front side) of the press-fitting fixing portion 11 is triangular. When the portion 11 is press-fitted into the attached member 5, the press-fitting fixing portion 11 is fixed to the attached member 5 in a detented state.

(Modification 3)
In the present invention, the recess 15 of the press-fitting and fixing portion 11 of the caulking nut 1 is not limited to the shape illustrated in the above embodiment and each modification, and the press-fitting and fixing portion 11 is fixed in a state of being prevented from rotating to the attached member 5. Any shape can be used.

(Modification example 4)
FIG. 6A is a cross-sectional view showing a modified example 4 of the caulking nut 1 according to the present invention, and is a view corresponding to FIG. 1C. As shown in FIG. 6A, the cap 3 may have a hemispherical shape as a whole.

(Modification 5)
FIG. 6B is a cross-sectional view showing a modified example 5 of the caulking nut 1 according to the present invention, and is a diagram corresponding to FIG. 1C. As shown in FIG. 6B, the cap 3 may have a flat surface on the hemispherical bottom portion 3a of the cap 3 shown in FIG. 1C.

(Modification 6)
In the present invention, the cap 3 is a bottomed tubular body, and if press working is possible, the cap 3 is not limited to the present embodiment, the modified example 4, and the modified example 5, depending on the mounting state of the caulking nut 1. It may be changed to a different shape.

(Modification 7)
In the caulking nut 1 according to the embodiment of the present invention, the press-fitting and fixing portion 11 is formed to have a diameter smaller than the outer peripheral surface 2a of the nut body 2 (see FIG. 1), but the present invention is not limited to this, and the press-fitting and fixing portion 11 is outside the press-fitting and fixing portion 11. The diameter may be the same as the outer diameter of the outer peripheral surface 2a of the nut body 2.

1 ... caulking nut, 2 ... nut body, 3 ... cap, 4 ... caulking fixing part, 5 ... mounted member, 6 ... screw hole, 7 ... nut mounting hole, 17 ... end face, 18 …… Pressurized member, 20 …… Pressurized member contact surface, CL …… Central axis

Claims (4)

A caulking fixing portion is formed on one end side in the axial direction of the nut body, and the caulking fixing portion is caulked and fixed to the mounted member in a state of being engaged with the nut mounting hole formed in the mounted member. In the caulking nut
In the nut body, a screw hole penetrates from one end side in the axial direction of the nut body to the other end side in the axial direction of the nut body along the central axis of the nut body, and the other end side in the axial direction of the nut body. And the cap is welded around the screw hole,
The cap is formed so as to cover the opening on the other end side in the axial direction of the screw hole.
On a virtual plane orthogonal to the central axis, if the direction extending radially from the central axis is the radial direction, the end surface on the other end side in the axial direction of the nut body and the position on the outer side in the radial direction from the cap. Is formed with a pressure member contact surface that contacts the pressure member that pressurizes the nut body toward the mounted member.
The pressure member contact surface is parallel to the virtual plane.
A caulking nut that is characterized by that. The caulking fixing portion has a substantially cylindrical pilot portion that is engaged with the nut mounting hole, and a press-fit fixing portion that is press-fit-fixed to the side surface of the mounted member.
The pilot portion has an outer peripheral surface whose external dimensions are gradually reduced as the distance from the tip surface side in the axial direction is along the central axis, and when the press-fitting and fixing portion is press-fitted into the mounted member, the pilot portion and the outer peripheral surface A part of the mounted member is accommodated in the gap between the nut mounting hole and the inner peripheral surface, and is fixed to the mounted member in a state of being prevented from coming off.
The press-fitting and fixing portion has a recess for accommodating a part of the attached member, and by press-fitting into the attached member, a part of the attached member is accommodated in the recess and described. It is fixed in a state where it is stopped from rotating with respect to the member to be attached.
The caulking nut according to claim 1. The outer shape of the cap on the virtual plane is circular, the area of the end face on the other end side in the axial direction of the nut before welding the cap is S1, and the pressure member of the nut body is in contact with the cap. Assuming that the area of the surface is S2, the outer diameter dimension is determined so that the ratio of S2 to S1 (S2 / S1) is 45% to 65%.
The caulking nut according to claim 2, characterized in that. The external shape of the pressure member contact surface on the virtual plane is circular, and the outer diameter dimension is the same as the maximum diameter of the press-fitting and fixing portion or larger than the maximum diameter of the press-fitting and fixing portion. is there,
The caulking nut according to claim 3, characterized in that.

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