Abstract: A caulking bolt includes a shank and a head, wherein a bearing face of the head has, along an outer circumference of the shank, a groove having a ring shape into which a crimped member is fitted. The caulking bolt includes projections and depressions for whirl-stop in the groove.

Abstract: The coating film peeling nut of the present invention has a notch 13 formed in an inner surface of a nut main body 10 on which a female screw 12 is formed, the notch 13 extending in a direction different from that of a lead angle of the female screw 12. The notch 13 is formed helically, and a winding direction thereof is the same as that of the female screw 12. A pitch of the notch 13 is 2 to 10 times a pitch of the female screw 12, and a depth of the notch 13 is 20 to 80% of a thread height of the female screw 12.

Abstract: The staking bolt of the present invention includes a head 10 and a shank 11 having an external thread 12. At the upper end of the shank 11, a ring-shaped protrusion 20 and a ring groove 21 located closer to the head relative to the ring-shaped protrusion 20 are formed. The head 10 is flat, and on the bearing face 13, a whirl-stop protrusion 14 having a plurality of radially extending arms 15 protrudes with a thickness of t. The minimum diameter D between respective arms 15 is larger than the outer diameter d of the ring-shaped protrusion 20, and t×(D?d)/2 which is the longitudinal cross-sectional area A of the minimum diameter portion of the whirl-stop protrusion 14 is equal to or greater than the longitudinal cross-sectional area of the ring groove 21.

Abstract: A nut is caulked and fixed to a plate material and a protrusion at an end of a collar is press-fitted into a recessed groove generated on the opposite surface of the plate material at the time of the caulking fixation, thereby fixing the nut and the collar to both surfaces of the plate material, respectively. The plate material is, for example, a metal panel, and the nut is, for example, a pierce nut. Since the collar is caulked and fixed, thermal strain is not generated.

Abstract: The coating film peeling nut of the present invention has a notch 13 formed in an inner surface of a nut main body 10 on which a female screw 12 is formed, the notch 13 extending in a direction different from that of a lead angle of the female screw 12. The notch 13 is formed helically, and a winding direction thereof is the same as that of the female screw 12. A pitch of the notch 13 is 2 to 10 times a pitch of the female screw 12, and a depth of the notch 13 is 20 to 80% of a thread height of the female screw 12.

Abstract: To threadedly engage a bolt and a female screw with each other, thereby making it possible to shave off a deposit on the inner surface of the female screw and to make it easy for a worker to sense the seating, there is provided a bolt including a shaft 2 and a head, wherein a first thread 11 is provided on a head side of the shaft, and at least one of a thread provided larger in diameter than the first thread and a thread provided wider than the first thread is provided on a tip end side of the shaft.

Abstract: A caulking bolt includes a shank and a head, wherein a bearing face of the head has, along an outer circumference of the shank, a groove having a ring shape into which a crimped member is fitted. The caulking bolt includes projections and depressions for whirl-stop in the groove.

Abstract: There is provided a caulking bolt which can be fastened by a general nut even when used to fix thin plates to each other, and which can also provide fitting strength similar to that of conventional products. The caulking bolt includes a head part and a shaft part, and has a non-circular, flat, rotation preventive protrusion formed on a seat surface of the head part. Also, the upper end of a normal complete thread part formed in the shaft part is brought close to the seat surface of the head part with a distance of 3 pitches or less, and an incomplete thread part formed at the portion of 3 pitches or less is used as a stopper part into which a metal flows when the caulking bolt is driven into a metal plate.

Abstract: There are provided a bolt caulking method and a bolt caulking device which ensure supply and caulking of a bolt as a single operation. The method is a bolt caulking method including supplying a bolt into a nose piece having a vertical hole, and lowering a punch from above to drive the bolt into a metal plate. The bolt is supplied through a pipe connected to a side of the nose piece, and dropped into a vertical hole formed in the nose piece along an inclined hole formed at a tip end of the pipe with a head part of the bolt being located on the topside. Thereafter, the punch which ejects air from a central hole is lowered within the vertical hole to drive the bolt into a metal plate while holding the bolt at a lower part of the vertical hole by the ejecting air flow.

Abstract: The staking bolt of the present invention includes a head 10 and a shank 11 having an external thread 12. At the upper end of the shank 11, a ring-shaped protrusion 20 and a ring groove 21 located closer to the head relative to the ring-shaped protrusion 20 are formed. The head 10 is flat, and on the bearing face 13, a whirl-stop protrusion 14 having a plurality of radially extending arms 15 protrudes with a thickness oft. The minimum diameter D between respective arms 15 is larger than the outer diameter d of the ring-shaped protrusion 20, and t×(D?d)/2 which is the longitudinal cross-sectional area A of the minimum diameter portion of the whirl-stop protrusion 14 is equal to or greater than the longitudinal cross-sectional area of the ring groove 21.

Abstract: There is provided a structure capable of ensuring a bearing surface pressure on an inner diameter side and an outer diameter side of a washer even if a thickness of the washer is suppressed. In a washer used at a fastening portion of a vehicle, a configuration in which a bearing surface is sectionalized into two faces, an inner abutting face and an outer abutting face, by an annular groove is adopted.

Abstract: The nut of the present invention is an encased nut including: a case body which is welded to a body; and a nut which is freely movably held inside the case body. The nut is composed of a hexagonal nut body and an insulating member made of a resin and insert-molded on the outer surface of this hexagonal nut body. The insulating member is provided with a plurality of protrusions on the side, abutting on the body, of the outer circumferential part. The nut is insulated, and thus is not affixed by electrodeposition coating.

Abstract: A nut is caulked and fixed to a plate material and a protrusion at an end of a collar is press-fitted into a recessed groove generated on the opposite surface of the plate material at the time of the caulking fixation, thereby fixing the nut and the collar to both surfaces of the plate material, respectively. The plate material is, for example, a metal panel, and the nut is, for example, a pierce nut. Since the collar is caulked and fixed, thermal strain is not generated.

Abstract: The nut of the present invention is an encased nut including: a case body 2 which is welded to a body 1; and a nut 3 which is freely movably held inside the case body 2. The nut 3 is composed of a hexagonal nut body 4 and an insulating member 5 made of a resin and insert-molded on the outer surface of this hexagonal nut body 4. The insulating member 5 is provided with a plurality of protrusions 9 on the side, abutting on the body 1, of the outer circumferential part. The nut 3 is insulated, and thus is not affixed by electrodeposition coating.

Abstract: A bolt for peeling a coating film of the present invention includes notch parts for peeling a coating film, the notch parts being formed over a plurality of pitches at top parts of screw threads in a male screw part formed in a shaft part. The bolt is characterized in that the respective notch parts formed over the plurality of pitches are arranged to be greatly inclined at an angle of 40° to 50° to an axial line of the shaft part. Since the respective notch parts can be rolled sequentially, it is possible to form the notch parts to be deeper and sharper than conventional ones and to enhance the coating film peeling performance. Also, the coating film peeled can be discharged efficiently as compared with conventional cases.

Abstract: The present invention provides a bolt that can exhibit a looseness-prevention function even though the bolt is repeatedly attached and detached. A bolt 1 includes a groove 4 that extends along a helix of a screw thread 3 and that is provided on a peak 31 of the screw thread 3. Further, the bolt is configured to include a plurality of the grooves 4 being spaced apart from each other along a helical direction of the screw thread 3.

Abstract: Provided is a case nut in which a nut that is held inside a case body so as to swing freely is not fixed as a result of electrodeposition coating treatment. The case nut is provided with a case body that is welded to a body, and a nut that is held inside the case body so as to float freely. The nut is provided with a metal nut body and a resin insulating member that is formed on the outside of the nut body and prevents contact of the upper surface, lower surface and outer surfaces of the nut body with the inner wall surfaces of the case body and with the body.

Abstract: There is provided a caulking bolt which can be fastened by a general nut even when used to fix thin plates to each other, and which can also provide fitting strength similar to that of conventional products. The caulking bolt includes a head part 11 and a shaft part 12, and has a non-circular, flat, rotation preventive protrusion 14 formed on a seat surface 13 of the head part. Also, the upper end of a normal complete thread part 17 formed in the shaft part 12 is brought close to the seat surface 13 of the head part with a distance of 3 pitches or less, and an incomplete thread part 18 formed at the portion of 3 pitches or less is used as a stopper part into which a metal flows when the caulking bolt is driven into a metal plate.

Abstract: Provided is a case nut in which a nut that is held inside a case body so as to swing freely is not fixed as a result of electrodeposition coating treatment. The case nut is provided with a case body 2 that is welded to a body 1, and a nut 3 that is held inside the case body 2 so as to float freely. The nut 3 is provided with a metal nut body 4 and a resin insulating member 6 that is formed on the outside of the nut body 4 and prevents contact of the upper surface, lower surface and outer surfaces of the nut body 4 with the inner wall surfaces of the case body 2 and with the body 1.

Abstract: There is provided a structure capable of ensuring a bearing surface pressure on an inner diameter side and an outer diameter side of a washer even if a thickness of the washer is suppressed. In a washer (1) used at a fastening portion of a vehicle, a configuration in which a bearing surface (5) is sectionalized into two faces, an inner abutting face (3) and an outer abutting face (4), by an annular groove (2) is adopted.