Abstract: A clamp for a construction strut that allows a pipe to be clamped to the construction strut in which the clamp has a fastener that is not exposed above the clamp curvature and in which the fastener head is easily accessible. Also the clamp has a retaining tab and a neck portion such that it can be installed either on the open side of the construction strut or on the closed side using slots in the closed side by straight-in passing the retaining tab past the inturned flanges on the top of the construction strut.

Abstract: A positive locking machine screw mechanism comprises a screw having a head and a body wherein the body includes male threads formed thereon wherein the threaded body has at least one longitudinal segment devoid of threads. A work piece defines a hole having female threads formed therein for receiving the screw and further defines in a portion of the hole, at least one longitudinally extending segment devoid of female threads. The longitudinal screw segment devoid of male threads and the longitudinal hole segment devoid of female threads are arranged such that the screw body is longitudinally received in the hole without engagement of the male screw threads with the female work piece threads.

Abstract: A separation fastener assembly includes a housing defining a cavity. A frangible nut is disposed in the cavity. The nut includes a plurality of nut segments. The one-piece frangible nut greatly reduces existing assembly problems and difficulties. Adjacent nut segments are interconnected at fracture lines. A bolt has an end coupled to the nut. A movable element is disposed in the housing and movable from a first position to a second position. In the first position, the nut segments are restrained from radial expansion. In the second position the nut segments are permitted to radially expand for releasing the fastener assembly.

Abstract: A device for fastening at least one object to a supporting part provided with a fastening bolt comprises an engaging arrangement (13) that can be brought into engagement with the fastening bolt. The engaging arrangement (13) is mounted on an inner cage (8) connected via a number of bent flexible connecting pieces (14, 15, 16, 17) to an outer cage (3), on which, in turn, at least one holding arrangement (1, 2) for holding the or each object is formed. This results in good tolerance compensation with regard to the position of the fastening bolt.

Abstract: A push nut including a base plate formed with a bolt passing hole at a center of the base plate and four engaging pieces. Pairs of engaging pieces extend respectively from a pair of opposing sides of the base plate, base portions of the four engaging pieces are folded back to have a U-shape, and tip end portions of the engaging pieces extend to a surrounding of the bolt passing hole. The tip end portions of the four engaging pieces surround a periphery of the bolt passing hole. The four engaging pieces incline toward an insertion direction of a bolt and elastically abut against an outer circumference of the bolt, which is inserted into the bolt passing hole.

Abstract: A nut for use with a self-threading bolt-like fastener possessing a cavity for collecting and compacting cuttings produced by the self-threading process. The central bore of the nut is partially threaded, the threads originating at the first end of the nut and terminating between the first end and the second end, the threads having the same pitch as the self-threading fastener it is intended for use with. The self-threading bolt-like fastener has a larger diameter across the cutting threads that the diameter of the central bore of the nut.

Abstract: In a cymbal mounting arrangement including a cymbal rod having a threaded distal end for receiving and supporting a cymbal thereover, an improvement including a quick-release locking device for retaining the cymbal on the rod. The locking device includes an elongated body having a longitudinal bore formed therethrough sized for close slidable engagement over the distal end of the cymbal rod. The locking device also includes a spring biased release arm pivotally connected within a cavity formed into the side of the body about a transverse pivot axis. The release arm is configured having thread-engaging teeth at a proximal end thereof which biasingly engage against a limited number of threads of the distal end of the cymbal rod. An upper distal end of the release arm, when pivoted toward said body, releases the teeth from engagement with the threads of the distal end of the cymbal rod, allowing the locking device to be repositioned along the distal end of the cymbal rod or removed therefrom.

Abstract: A screw nut from a metal material, which comprises a tapped hole and an inner groove which radially extends in relation to the longitudinal axis thereof. An annular collar is formed onto one of the faces of the screw nut and its cross-section is bent in the direction of the axis to such a degree as to delimit, together with a section of the face surrounding the tapped hole as a contact surface, a receiving slot that is directly associated therewith.

Abstract: A threaded collapsible insert is utilized for insertion into a hole in a workpiece for subsequent installation of a threaded fastener. The insert has a axially-aligned opening extending for most or all of the entire length of the body of the insert. The hollow body has a first section and a second section, where the wall thickness of the first section is less than the wall thickness of the second section, such that the first section preferentially collapses upon application of a linear force to the insert. The second section comprises internal threads for engaging the fastener. The head member has a top side and an underside. The underside of the head member may comprise a plurality of knurls radiating outwardly on the underside of the flange. The outside of the first section may also comprise a plurality of axially aligned rib members extending from the proximal end to the distal end.

Abstract: A split nut has two halves securely fastened to one another by magnets. The magnets may be attached to the nut or the nut itself can be magnetized. The magnets secure the two halves together so that the threads of each half are in alignment and the nut may be moved along a threaded shaft. The nut may be attached to a threaded shaft anywhere along the length of the shaft. The nut has the ability to realign or reform a damaged portion of the threaded shaft. The nut can also be used for tightening, in the manner of a conventional nut. Moreover, the nut can be used for extracting by pushing, as for example in removing steering wheels for a steering column. Also, if provided with a gasket, the nut can stop leaks.

Abstract: A releasable fastener for releasably engaging a bolt body has a generally cylindrical sleeve member having an inner surface closely spaced from an outer surface of the bolt body. A latch member having a contact surface is mounted on the sleeve member for movement between a first position wherein the contact surface is in engagement with the bolt body and a second position wherein the contact surface is not in engagement with the bolt body.

Abstract: The female attachment, which is made of plastics material, has a recess and at least two lugs projecting into the recess for clipping it to a stud. It includes connecting members extending between a first body and a second body and delimiting the recess, the connecting members comprising at least one rigid arm and at least two flexible strips separated from each other. The obturator includes a female attachment of the above kind and a skirt.

Abstract: A device for mounting a component, such as a pipe, on a threaded stud comprises a main body section with a bore for inserting a stud and a component mounting section. The device includes only a single pawl that extends from a first inner wall of the bore in a direction perpendicular to the axis of the bore. The pawl has a flexible thin section connected to the inner wall and a thick section extending from the thin section. The pawl can be bent in opposite directions at the thin section. A pair of thread engaging sections for engaging threads of the stud are formed at an end of the thick section. A pair of grooves for engaging threads are formed adjacent to respective engaging sections.

Abstract: A mounting body 100 in accordance with the invention is mounted to a bolt body from a side portion of the bolt body. The mounting body 100 is provided with a mounting portion 10 having an engagement portion 20 provided with an engagement projection 21 engaging with an outer thread of the bolt body, an opening portion 70 moving forward the bolt body into the engagement portion 20, and adjacent portions 30 arranged in a leading end side of the engagement portion 20. The mounting body 100 can be mounted to the bolt body by moving forward the bolt body from the opening portion 70 of the mounting portion 10, thereafter plastically deforming the engagement portion 20 so as to make the adjacent portions 30 relatively close to each other, arranging the engagement portion 20 along an outer surface of the bolt body, and maintaining a state in which the engagement projection 21 is engaged with the outer thread of the bolt body.

Abstract: A fastener receiving member has a substrate which comprises channels for receiving one or more threaded fasteners. The channels permit positional adjustment of the threaded fasteners and positional adjustment of other components secured by the threaded fasteners relative to the fastener receiving member. Each channel comprises a pair of opposing sidewalls which are spaced apart from one another and which are preferably formed from a relatively soft material, such as plastic. When a fastener is rotatably driven into a channel, the threads of the fasteners deform the material of the opposing sidewalls to form deformations in the sidewalls. The threads of the fastener and the deformations formed by the threads in the sidewalls of the channel cooperate to retain the fastener in the channel.

Abstract: The present invention relates to a tuning screw assembly comprising a sleeve (100) with internal threads for engaging a tuning screw (200) having external threads. The sleeve comprises a first threaded portion (32) which is axially displaced in relation to a second threaded portion (34) for frictionally locking said screw body in said sleeve. The invention also relates to a method of manufacturing said friction locking sleeve and to a resonator comprising said friction locking sleeve.

Abstract: The present invention has been made to solve the above problems, and accordingly an object thereof is to provide a looseness preventive nut which does not loosen even if vibrations are applied, and can be used as a single nut. In at least a first embodiment, the invention provides a looseness preventive nut 1 which is a nut threadedly engaging with a bolt 10, the nut being configured so that a lateral groove 3 extending in the radial direction in the range such that at least a part of a threaded portion 2 is cut, preferably in the range beyond the centerline C of the nut, is formed at a position slightly lower than a substantially middle point of the nut in the height direction.

Abstract: A fastener includes a sleeve-like clamping element having a cavity extending in the direction of its longitudinal axis which accommodates a threaded stud. At least one clamping region is deformable into the cavity forming at least one clamping ramp inclined toward the longitudinal axis on an outside of the clamping element. A clamping sleeve pushed onto the clamping element in an installed state grips around the clamping element. A clamping sleeve inner surface cooperates with the clamping ramp so the clamping region reaches a clamping position deformed into the cavity to hold the threaded stud. The clamping element has a forward end flange in an installation direction. Coupling elements and mating coupling elements arranged on the flange and a clamping sleeve end facing the flange interlock in the installed state, preventing rotation between the clamping sleeve and clamping element.

Abstract: A fastening arrangement comprising a thread-forming lobular screw and a member defining a non-tapped pilot hole therein. The screw has a shaft and a head joined to a proximal end of the shaft, the shaft defining a plurality N of lobes circumferentially spaced about a central longitudinal axis of the shaft, a thread being formed on an outer surface of the shaft. The pilot hole comprises a central portion of a diameter intermediate the minor and major diameters of the screw thread, and a plurality N of circumferentially spaced cutouts extending radially out from the central portion. A plurality of longitudinally extending edges parallel to the axis of the screw are defined at junctures between the cutouts and central portion of the pilot hole. The screw thread forms a thread in the member beginning at the longitudinal edges of the pilot hole.

Abstract: A technique for connecting expandable tubulars. The technique comprises an expandable connector system that facilitates the connection of tubular components, such as tubulars used in wellbore environments.

Abstract: A clip has a retainer for securing the clip and a wire harness to a bolt protruding from a vehicle surface. The retainer includes a beam having an aperture with an inner wall. The aperture receives the bolt. A flange projects into the aperture from the wall. An opening in the wall opposite the flange communicates with a passage in the beam. A sliding component of the retainer has a flanged end for insertion into the passage and through the beam into the aperture. The flange and the flanged end of the component are received between selected threads of the bolt to clamp the bolt in the aperture. Projections extending from opposite edges of the sliding component are received in cavities along side walls of the beam passage in positions corresponding to the size of the bolt. The projections and cavities cooperate to secure the sliding component in the beam.

Abstract: A docking apparatus for printed circuit boards including a cassette housing defining a housing cavity for containing a printed circuit board (PCB) and a linkage mechanism associated with the cassette housing. The linkage mechanism includes a linkage arm pivotally connected to the cassette housing via a pivot and has a first arm pivotally connected to the PCB, a traveler having a threaded bore therethrough connected to a second arm extending from the first arm, a shaft threadedly engaged in the left handed threaded bore through the traveler at a first end defining the shaft, the first end configured to operably transfer axial translation of the shaft to the traveler, and an opposite second end defining the shaft threaded engaged in a right handed threaded bore through a split nut operably secured to the cassette housing.

Abstract: A fastener, for use with a sheet-shaped member, comprises a tubular shank, a plurality of holding pieces extending outward from a first end of the shank, a flange extending outward from a second end of the shank, and a plurality of stud-engagement pawls extending into the interior of the shank. The shank has a length less than that of a stem of a stud fixed to a mounting member with which the fastener is to be engaged. When the stud is fully inserted into the tubular shank, the sheet-shaped member is fastened to the stud and the stud stem protrudes from a surface of the sheet-shaped member. The protruding portion of the stem allows an auxiliary member to be mounted thereto.

Abstract: The disclosed fastener includes a body having a cavity therein and a wall at least partially surrounding said cavity. The fastener additionally includes a finger having a first member extending from the wall. The first member is attached to a second member having at least one engagement mechanism on its distal end adapted to cooperate with a second engagement mechanism on the stud to retain the fastener on the stud. The first member extends outwardly from the wall and the second member extends inwardly into the cavity. A plurality of fingers each include a lower surface angled upwardly toward the center of the cavity such that a stud contacting the lower surface will be moved toward the center of the cavity.

Abstract: The present invention relates to a fluid connector, comprising a shaft having at least one solid shaft element and a plurality of connector surfaces, wherein the plurality of connector surfaces includes a surface with a plurality of threads and a plurality of grooves.

Abstract: A device for mounting a component, such as a pipe, on a threaded stud comprises a main body section with a bore for inserting a stud and a component mounting section. A plurality of pawls extend from the inner wall of the bore in a direction perpendicular to the axis of the bore. Each of the pawls has a flexible thin section connected to the inner wall and a thick section extending from the thin section. The pawls can be bent in opposite directions at the thin sections. A pair of engaging sections for engaging threads of the stud are formed at the end of each thick section. A pair of grooves for engaging threads are formed adjacent to the engaging sections.

Abstract: An attachment clip 10 is provided to attach a heat shielding plate 4 to an under-panel 2. The under-panel 2 has a bolt 5 projecting from a floor tunnel 2a. The heat shielding plate 4 has a bolt hole 4a formed to allow passage of a shank 5a of the bolt 5. The attachment clip 10 has a clip body 11 having an abutting part 13 for abutment on the heat shielding plate 4. The abutting part 13 has a shank hole 12 for passage of the shank 5a of the bolt 5. The attachment clip 10 further includes six engagement claws 10A–10F projecting from the inner periphery of the clip body 11 inwardly. The engagement claws 10A–10F have respective engagement tips 10a–10f formed to depart from the clip body 11 along the axial direction of the attachment chip 10, providing a substantial cone-shaped configuration. The engagement claws 10A–10F elastically engage with threads of the shank 5a while urging the heat shielding plate 4 toward the under-panel 2 along the axial direction of the bolt 5.

Abstract: A device for fastening tubular objects includes a C-shaped mounting rail (3) and a rail nut formed of a hollow profile having at least two constriction areas (13a, 13b and 14a, 14b) defining a through-opening (8) which is formed by two hollow cylindrical sections (9a, 9b) extending parallel to a longitudinal axis of the through-opening (8) and having respective inner thread sections (10a, 10b) for receiving a fastening element there between.

Abstract: A quick coupling nut includes a body having a bore therethrough and adjacent side holes. A pair of threaded members are disposed in the bore and moveable in a radial direction of the bore and a cap having a bore therethrough, coaxial with the body bore, includes depending guides which are received by the guide holes for enabling axial movement between the cap and the body. Actuators depending from the cap engage the threaded members in order to urge the threaded members radially inward to engage a threaded bolt shank, extending through the cap and body bores, as the cap is moved axially toward the body. This threaded engagements enables tightening of the quick coupling cap by rotation about the threaded bolt shank.

Abstract: A self-locking screw connection includes a cylindrical thread section (130) and a nut (300) that can be snapped onto the cylindrical thread section (130). The nut (300) has a thread that is divided into several thread segments (322), and the cylindrical thread section (130) has a plurality of threadless chambers (134) that are spaced from one another along the circumference of the cylindrical thread section (130). The threadless chambers allow immersion of one of the thread segments into one of the threadless chambers for providing a self-locking effect.

Abstract: This invention pertains fasteners which are characterized by easy insertion and extraordinarily difficult separation of items that they attach together. This is achieved by a combination of snapping segments with multi-engagement configurations of engageable holes. The snapping segments may comprise anti-opening and/or anti-sliding portions, which immensely increase the strength with which the fasteners hold the objects together. Provision of an elastic body in the vicinity of the bottom section of the fasteners provides water and gas proof properties, and further eliminates squeaking noises. Vehicles comprising objects connected together by the fastening devices described and claimed herein are part of the instant invention.

Abstract: An adjustable nut comprises a main body having an axial passageway and a locking insert. First and second wing members are pivotally mounted to the main body, whereby the wing members include respective cam surfaces that deflect the inner surface of the locking insert toward the threaded shaft. The assembly provides three different mounting arrangements. The first and second wing members are adapted to provide (1) a locking position where the main body is immovably locked to the threaded shaft, (2) an adjustment position where the first wing member is in the locking position and the second wing member is in an unlocking position to permit selective adjustment of the main body with respect to the threaded shaft, and (3) a sliding position where the first and second wing members are in an unlocking position to permit the main body to slide axially along the threaded member.

Abstract: A press-in fastening apparatus and method couples a screw with a nut by pushing the screw through an opening of the nut along a slip axis and rotating the nut to align a lock axis with the inserted screw. The opening of the nut along the slip axis has a diameter greater than the diameter of the screw and the opening of the nut along the lock axis has a diameter that engages screw threads with nut threads. In one embodiment, the nut is disposed in a housing coupled to an information handling system and biased to align with the lock axis so that a module is secured to the information handling system by aligning a screw coupled to the module with the nut and pushing the screw into the nut. The module is removed from the information handling system by unscrewing the screw with engagement of the screw threads and nut threads.

Abstract: The present invention provides for fastener inserts and methods of manufacturing the same. The fastener inserts include selectively removable tangs which can be broken away more cleanly than with other commercially available fastener inserts. Further, the methods of manufacture offer a significant improvement in the production process.

Abstract: A ratcheting fastener system such as for point of purchase displays. A bolt has a shank with a head end and a distal end, and a plurality of bolt threads on the shank, each thread having a thread start at the distal end. A nut has a bore with a plurality of thread segments in the bore adapted for engaging the bolt threads when axial force is applied to the bolt with the distal end inserted in the nut. Deflection of the nut thread segments occurs in controlled locations. The bolt and nut can be formed as a single unit connected by a frangible link.

Abstract: A faucet clamp for retaining a faucet to a sink has first and second jaws that are pivoted together by a hinge. The jaws have internal clamping surfaces which include a thread-engaging surface, for example a compliant liner. The thread-engaging surface engages the threads of a faucet pipe extending from the faucet base and clamps the faucet to the sink. The jaws of the faucet clamp pivot to an open position for installation or removal over the faucet pipe.

Abstract: A device for mounting a component, such as a pipe, on a threaded stud comprises a main body section with a bore for inserting a stud and a component mounting section. A plurality of pawls extend from the inner wall of the bore in a direction perpendicular to the axis of the bore. Each of the pawls has a flexible thin section connected to the inner wall and a thick section extending from the thin section. The pawls can be bent in opposite directions at the thin sections. A pair of engaging sections for engaging threads of the stud are formed at the end of each thick section. A pair of grooves for engaging threads are formed adjacent to the engaging sections.

Abstract: A fastener, for use with a sheet-shaped member, comprises a tubular shank, a plurality of holding pieces extending outward from a first end of the shank, a flange extending outward from a second end of the shank, and a plurality of stud-engagement pawls extending into the interior of the shank. The shank has a length less than that of a stem of a stud fixed to a mounting member with which the fastener is to be engaged. When the stud is fully inserted into the tubular shank, the sheet-shaped member is fastened to the stud and the stud stem protrudes from a surface of the sheet-shaped member. The protruding portion of the stem allows an auxiliary member to be mounted thereto.

Abstract: A plastic fastening element is configured to be fastened on a threaded bolt welded to a support member. The fastening element includes a first hollow element portion made of plastic material and having an axial through hole. The through hole has a polygonal cross section and radially resilient wall portions that will be radially outwardly deformed if the first element portion is pushed onto the threaded bolt. The fastening element also includes a second hollow annular element portion which is connected to one end of the first element portion by a breakable connecting portion. The second element portion has an inner cross section dimensioned such that the second element portion can be pushed over the first element portion under radial deformation of the resilient wall portions, whereby a thread of the threaded bolt is partially formed into the resilient wall portions of the first element portion.

Abstract: An attachment clip 10 is provided to attach a heat shielding plate 4 to an under-panel 2. The under-panel 2 has a bolt 5 projecting from a floor tunnel 2a. The heat shielding plate 4 has a bolt hole 4a formed to allow passage of a shank 5a of the bolt 5. The attachment clip 10 has a clip body 11 having an abutting part 13 for abutment on the heat shielding plate 4. The abutting part 13 has a shank hole 12 for passage of the shank 5a of the bolt 5. The attachment clip 10 further includes six engagement claws 10A-10F projecting from the inner periphery of the clip body 11 inwardly. The engagement claws 10A-10F have respective engagement tips 10a-10f formed to depart from the clip body 11 along the axial direction of the attachment chip 10, providing a substantial cone-shaped configuration. The engagement claws 10A-10F elastically engage with threads of the shank 5a while urging the heat shielding plate 4 toward the under-panel 2 along the axial direction of the bolt 5.

Abstract: The present invention relates to a tuning screw assembly comprising a sleeve (100) with internal threads for engaging a tuning screw (200) having external threads. The sleeve comprises a first threaded portion (32) which is axially displaced in relation to a second threaded portion (34) for frictionally locking said screw body in said sleeve. The invention also relates to a method of manufacturing said friction locking sleeve and to a resonator comprising said friction locking sleeve.

Abstract: A blind fastener with an improved drive nut and assembly process. The blind fastener includes a screw, a sleeve, a nut, and a drive nut. The drive nut has a smooth bore and protruding nibs that mate precisely with a driving recess located in the nut head. A side portion of the drive nut is deformed to retain the drive nut on the screw against the nut. Once the new assembly process for the blind fastener has been completed, the drive nut will have been mated with the nut head to prevent any rotation of the nut during installation of the blind fastener. The assembly process includes placing the sleeve over the threads of the screw to a position adjacent the screw head. The nut is then threaded onto the screw adjacent the sleeve. The protruding nibs of the drive nut are next aligned and physically engaged into the driving recess of the nut head by sliding the smooth bore over the screw.

Abstract: An expandable body of expansion bolt comprises an upper section having a hollow upper circular member including a cut and a connection member coupled to the upper section, and a hollow lower circular member including a cut and a dent with the connection member received therein; a middle section having a plurality of parallel longitudinal slots; and a lower section having a plurality of substantially rectangular members on a lower portion. In operation, a piece of object is fastened between lower portion of the lower section and the middle section by driving the bolt in response to an insertion of the bolt through the body and the piece of object. A variety of configurations of upper section and circular members are provided for enhancing the positioning of the expandable body and guiding of the thread of bolt.

Abstract: A fastener for receiving a sink unit in a worktop has a plastics clip for attaching to a tab or rail and a hinged clamping member (11) which is tightened up against the underside of the worktop by a screw. The screw can be pressed through a bore in the hinge pin and self-tap into a non-threaded passage in the clip when the clamping member is hinged to engage under the worktop. The bore through the hinge pin has small flexible tags projecting into it past which the screw thread can snap, but which retain the screw when that is not engaged with the clip. The hinge pin and the clip have mutually engageable detents which locate the pin, and thus the clamping member, in either the operative position, for engaging the worktop, or the non-operative position with the clamping member swung back free of the worktop.

Abstract: The invention concerns a hold-down fastener including a barrel including internal lips cooperating with a screw thread, the lips being directed inwards of the barrel and inclined in a direction of insertion of the screw into the barrel. Each lip includes at least two parts, a first part connected to the barrel and inclined at a first angle relative to the barrel, on the side for inserting the screw, and a second part connected to the first part and inclined at a second angle relative to the barrel, on the side for inserting the screw. The second angle is larger than the first angle and less than 180° to facilitate the insertion of the screw into the barrel, while maintaining the fastener screw-holding power after the screw has been inserted. The invention is useful for fixing in place electric cables, piping systems, and other cylindrical articles.

Abstract: An adjustable-height stand that attaches to a device and allows for rough and fine adjustment of the height of the device. The stand has a screw rod, an adjusting mechanism, and a supporting mechanism. The supporting mechanism attaches to the device. The adjusting mechanism is connected to the supporting mechanism and the screw rod and has two states. In the fine adjustment state, the height is adjusted by turning the screw rod. In the rough adjustment state, the contact between the screw rod and the adjusting mechanism can be broken so that the supporting mechanism can slide up and down the length of the screw rod without turning the screw rod.

Abstract: An expansion dowel has an expansion sleeve (7) insertable into an axially extending dowel body (1) which has a central through opening (2) and a collar (6). The leading end region (3) of the dowel body (1) in the setting direction (S) has an internal thread (8) acting as a load application means, and the oppositely located, trailing end region (4) has at least one axially extending slit (5), and serves to receive the expansion sleeve (7). Due to the fact that there is at least one joint arranged in the leading end region (3) of the dowel body (1) adjoining the internal thread (8), a threaded rod (10) can be inserted up to the desired position in the through opening (2) by a slight axial pressure in the setting direction (S).

Abstract: A three-sided, progressively-formed threaded fastener is comprised of a plurality of planar longitudinal faces intersecting at comer areas. Shank tabs extend downward from the bottom of each of the faces at the base of the fastener. Threaded regions along the inside surface of the planar faces are coined indentations applied during the formation of the fastener. A plurality of wedge-shaped protrusions extend downward from the comer areas at the base of the fastener. The combination of shank tabs and wedge-shaped protrusions form a clinch profile along the bottom of the fastener so that it may can be affixed to a sheet of metal by clinch fit.

Abstract: The present invention has been accomplished to provide an earth nut which has an excellent grounding performance, and which is free from the possibility of losing a grounding function even upon application of a high axial force and is low in cost, said earth nut comprises a flanged nut having a flange, which is formed at a lower end of a nut body to be integral with the nut body, a plurality of projections formed at a lower portion of the flange near an outer peripheral edge of the flange for cutting and peeling off a coating film on a seat surface, with which a bottom surface of the nut contacts, and a plurality of longitudinal grooves provided on screw threads of a female thread portion of the nut body to extend axially of the nut body and having edges on one sides of lines of intersection of the screw threads of the female thread portion of the nut and the longitudinal grooves to peel off a coating film adhered to screw threads of a bolt, onto which the nut are screwed.

Abstract: It is an object of the invention to provide a structure of an internal thread portion for preventing looseness which structure allows a reduction in the torque required for the threaded engagement with an external-thread member and prevents a seizure. An exit end portion of a self-locking nut is taperingly contracted over the entire circumference thereof so as to form a contracted internal thread portion having a conical section. In addition, ridges of the contracted internal thread portion are provided with corrugation continuing circumferentially. The diameter of an inscribed circle which links the extremities of projections in the corrugation is smaller than the minor diameter of the external-thread member which is to be engaged threadedly with the internal thread portion.