Abstract: A unique self-drilling anchor screw is configured so that it can be set and used to secure a first object to a second object using only one tool to save time and effort. A nut of the screw engages a nut stop when turning in reverse, thereby driving rotation of the screw in reverse. The screw has a drill bit tip adapted for drilling a hole while turning in reverse. A hole is drilled using the drill bit tip while turning the nut in reverse with a socket wrench of the one tool. After drilling the hole, the nut is turned in the forward direction with the socket wrench to engage a sleeve member of the screw, which sets the screw in the second object. Then, the nut is further turned forward using the socket wrench to tighten the nut against the first object located between the nut and the second object.

Abstract: A fastener adapted for anchoring engineered lumber panels has a threaded portion with a double included securement thread having an included angle between 15° and 25°. The ratio of the major thread diameter to the minor diameter exceeds 2.0 to provide a large thread surface to resist pull out. The fastener also includes a drill tip having an effective diameter substantially equal to the minor diameter of the thread. The fastener is configured to resist cocking upon being driven into the engineered lumber panel and to resist marring of the panel fascia.

Abstract: A self-drilling fastener for use in a friable material with or without an underlying member at the point of use comprises an elongated body, a threaded exterior, an enlarged head with torque transmitting surfaces, proximal, intermediate, and distal portions, and a drilling tip generally opposite enlarged head. Proximal portion has an axial length, a threaded exterior having root and crest diameters and a thread height, where the crest diameter is about twice the root diameter. Intermediate portion has an axial length, a threaded exterior having a root, a crest diameter substantially smaller than proximal portion crest diameter and a thread height substantially smaller than proximal portion thread height. Distal portion has an axial length, a threaded exterior with a root that tapers toward the drilling tip, a crest diameter substantially smaller than the proximal portion crest diameter, and a thread height substantially smaller than the proximal portion thread height portion.

Abstract: Disclosed is a screw for hard wood, comprising a screw tip (3) with two cutting edges (5) that extend approximately parallel to each other and perpendicular to the longitudinal axis of the screw. The cutting angle of the cutting edges amounts to about 90°. A centering tip (7) which slightly protrudes from the two cutting edges (5) is embodied in the extension of the longitudinal axis of the screw. Said centering tip (7) prevents the screw from deviating to the side at the beginning of the drilling process.

Abstract: Device for tightened connection of structural parts positioned with distance between each other having a self-cutting screw penetrating an upper and a following lower structural part, and a screw thread engaging the structural parts. The upper structural part is prolonged by longitudinal rails received in recesses in the lower structural part, and an advance bolt is put in advance to the screw. The advance bolt stays in its advance position upon screwing back the screw thereby that a connection element activated by the displaced advance bolt causes a connection between the lower structural part and the longitudinal rails. Thereby both structural parts are kept at the existing distance.

Abstract: First and second components are connected together by a fastener that includes a head and a shank having a bolt portion and a drill portion. The fastener is initially rotated relative to the first and second components such that the drill portion drills a hole through the first and second components. Then, the drive portion of the fastener is removed from the bolt portion of the shank of the fastener, such as by using a removal tool. Lastly, a nut is installed on the bolt portion of the shank of the fastener.

Abstract: A composite fastener, a belly nut, a tie system and/or a method reduce heat transfer through a building envelope. The composite fastener, the belly nut, the tie system and/or the method secure a wall to a backup structure. The composite fastener is constructed from a fiber reinforced polymer that has fibers embedded in a polymeric matrix. The composite fastener has a low thermal conductive value (k-value) and has non-corrosive properties. The belly nut has a fastening hole on a first side of the belly nut to attach the composite fastener to the belly nut. Further, the belly nut has a pathway to receive a leg of a pintle from a top surface of the belly nut to a bottom surface of the belly nut. The pathway is sized to allow for greater vertical adjustment eccentricity between the belly nut and the pintle without creating large horizontal deflections of the tie system.

Abstract: A drilling fastener utilizes at least two sides jointed to form a shank. A corner point is formed between any two sides for outwardly extending a rib therefrom. The rib includes a cutting section extended outwardly from the corner point about an arc contour, and a arc section whose two sides respectively connect to the cutting section and the side. A cutting tip is formed at a convergence of the cutting section and the arc section and located at which the largest outer diameter of the shank is defined. An accommodating room is defined between each arc section and the side. Thereby, the auxiliary cutting provided by the cutting tip allows the debris to be swiftly extruded via the accommodating room, thence preferably decreasing the driving torque and preventing the workpiece from being damaged. The fixing efficiency after screwing is further promoted.

Abstract: An anchoring device having a tapered, at least partially threaded shank with a front end, a drilling head and at a rear end thereof, a torque applying head and an anchor coaxially enveloping a front portion of the shank. The arrangement is such that during drilling through the structure the anchor axially displaces towards the rear end of the shank, wherein the shank tightens against an inside surface of the anchor so as to expand the anchor within the bore being simultaneously drilled, for fixedly retaining thereof within the structure.

Abstract: A screw with double notches includes a head portion, a shank portion extended outward from the head portion, a threaded section spirally surrounded on the shank portion. Wherein, a raw section on the shank portion is provided with a cambered surface formed integral with the shank portion in cross-section, and a notched section relative to the raw section has two cutting notches separately depressed into the shank portion and disposed near an end of the shank portion, thereby forming a protrudent part between the two cutting notches. By means of the cooperation of the cutting notches and the raw section, the cutting capability and the removal of debris are increased so that a fastened object is prevented from split. Thereby, the drilling speed is promoted, and the effort to rotate the screw is lessened. While the supporting strength of the screw is improved, the screw does not break easily while screwing.

Abstract: A self-drilling anchor for use in a friable material or a semi-rigid material comprises a body having an axis, an axial bore adapted to receive a fastener, a proximal end, a drilling end, a proximal portion adjacent the proximal end having high threading having a crest diameter for engaging the friable or semi-rigid material, and a drilling portion adjacent the drilling end, an additional thread proximate the proximal end, the additional thread continuing between turns of the high threading, and a head at the proximal end having an outer diameter that is smaller than the crest diameter. The anchor additional thread is configured to engage either the friable material or, additionally, to firmly engage the semi-rigid material.

Abstract: A self-tapping screw having a boring part and a threaded shaft for fixing a panel-type object to a preferably metallic substructure is provided. The screw is configured in such a way that it produces a through hole in the panel type object, said hole accommodating the shaft with a degree of play and so that it produces a bore in the substructure into which the thread on the shaft cuts a counter-thread. The boring part includes a boring tip that is located eccentrically in relation to the longitudinal axis of the screw. The tip centers the screw during the positioning operation in such a way that the boring part executes a circular displacement about the boring tip, which expands the through hole to the desired size, whereas the bore in the substructure is produced with the diameter of the boring part.

Abstract: A fastener includes an elongated body having a first end and a second end, a helical thread having a crest, a root, and flank portions formed on at least a portion of the elongated body, and at least one protrusion extending from the crest and flank portion. The at least one protrusion is an axially extending V-shape of the crest, flank portions, and root of the helical thread with a peak of the at least one protrusion having a ridge that extends radially outward from the root of the thread.

Abstract: A self-countersinking, self-tapping screw has a head with a substantially flat underside that acts like a washer for bearing against a surface of a material into which the screw is inserted. On an underside of the head are one or more material-receiving pockets. These pockets receive material when the head of the screw bears against the surface. These pockets thus help lock the screw in place, i.e. help to prevent the screw from loosening over time. These pockets may have a circular or non-circular shape.

Abstract: A fastening assembly for attachment of objects (1) to substrates (2) formed from friable materials, such as plasterboard, includes one or more longitudinal pins (8) having threaded head portions (10), which thread into one or more corresponding threaded apertures (3) in the object, such as a bracket. Each pin (8) has a shank (11) which passes through the aperture (3) in the object (1), and through the substrate (2), such that an end of the shank (11) preferably protrudes through the substrate (2) before the threaded head portion (10) engages the threaded portion of the aperture (3) to lock the pin (8) to the object (1). The apertures (3) in the object (1) may be arranged with their axes at different angles so that the pins (8) pass into the substrate (2) at different angles.

Abstract: A self drilling anchor for use in a friable material mounted on a member comprises an elongated body having an axis, an axial bore adapted to receive an elongated fastener, a flared end having torque transmitting surfaces therein, a proximal portion, an intermediate portion, a distal portion, and a drilling tip generally opposite the flared end, wherein the proximal portion has a threaded exterior having a root, a crest diameter, and a thread height, the intermediate portion has a threaded exterior having a root, a crest diameter substantially smaller than the crest diameter of the proximal portion, and a thread height substantially smaller than the thread height of the proximal portion, and the distal portion has a threaded exterior with a root that tapers toward the drilling tip, a crest diameter substantially smaller than the crest diameter of the proximal portion, and a thread height substantially smaller than the thread height of the proximal portion.

Abstract: A self-drilling fastener from which objects may be hung, for use in a friable material with or without an underlying member at the point of use or in a semi-rigid material such as a hollow core door comprises an elongated body having a threaded exterior with separate threads for drilling into the member, gripping the member, gripping the friable material and/or gripping the semi-rigid material. The fastener may further have a thread having a relatively small-diametered solid portion from which objects hang and an axially expanding angled portion for biasing the object toward the solid portion to stabilize and prevent the object from dislodging from the fastener.

Abstract: A screw, in particular a self-tapping screw, has a screw thread which covers up to the front end of the screw formed as a drilling tip or cutting tip. In the front area, starting with a distance from the front end of the screw, there is an opposite thread showing the same pitch as the screw thread, however, its thread height is lower than the thread height of the screw thread. This second, opposite single-thread, double-thread or triple-thread/multi-thread forms a cutting edge with its thread edge which is used to cut fibers in order to reduce wedge effect during screwing in the screw. The screw is particularly suitable for wood or wood-like materials in the edge areas of structural elements.

Abstract: A self-boring screw (2) having a boring section (6) attached to the free end of the screw shaft (4), two vanes (12) radially protruding from the boring section, the edges of the vanes facing toward the boring tip (8) of the boring section (6) being configured as boring blades (13). The boring section (6) includes a chip discharge zone (14) that is configured such that the edges of the vanes (12) facing toward the boring tip (8) forms a cutting point (S) with a boring radius (16), the cutting point having a distance (A) to the screw shaft (4) that is at least ? of the cutting edge length of the bore tip (8). The chip discharge zone (14) makes it possible that the chips produced by the boring blade (10) at the boring tip (8) can be discharged freely and without buildup.

Abstract: A self-tapping screw is disclosed. The screw having a shaft bearing at least partially a thread, which shaft defines a longitudinal axis and on whose first end a drill point with a maximum width and on whose opposing second end a head are arranged, as well as having at least one first cutting edge and having at least one second cutting edge. A recess through which the longitudinal axis passes is arranged between the two cutting edges, with the minimum axial depth of the recess corresponding to at least 0.08 times the maximum width of the drill point.

Abstract: A self-drilling screw is in particular to a drill portion having a non-threaded first drilling section connecting with the shank and a second drilling section connecting with said first drilling section and forms two grooves therein. Moreover, the whole first drilling section is formed as an oval-shaped pillar and it has two ridges extending therefrom. Furthermore, the diameter of the first drilling section is smaller than the diameter of the second drilling section, and the length of the second drilling section is between the length of one-third drill portion and the length of two-thirds drill portion. Therefore, due to the aforesaid features and the two drilling sections, the molds for manufacturing the screws suffer less damage while in operation and the manufacturing cost is therefore reduced. The present invention is also good at increasing the screwing speed. Moreover, the surface of the first drilling section also has the function of allowing the user to engrave a mark thereon.

Abstract: A fastener with multiple thread characteristics includes a shank and head. The shank has a penetrating tip distal most from the head. The shank includes a first, conventional thread formation formed therein adjacent the penetrating tip and a second, anti-back-out thread formation adjacent the conventional thread formation, between the conventional thread formation and the head.

Abstract: A self-tapping screw comprises a self-tapping screw having a screw rod; one end of the screw rod being a head and another end thereof being a drilling head; the drilling head having two extending surfaces which are symmetrical; each extending surface being formed with a cutting teeth set; each cutting teeth set having a plurality of cutting teeth; each extending surface extending from a tip of the drilling head and having an approximate sector area; a notch being formed between each two adjacent radial edges of the two extending surfaces. Each cutting tooth is protruded from the extending surface.

Abstract: The present invention utilises impact-driven fastener (1) having a twisted body having: a common axial core (2) a protruding helix (3) and a trailing elongate lost-end driving shank: (4) of reduced radial diameter. The fastener incorporates two or three loosely wound loosely wound thread-cutting blade-like helical projections (5) extending radially from a solid axial core (2). These blade-like projections (5) are inclined upon a sweeping helical angle (8) of less than 42° to the longitudinal axis (9) of the core (2).

Abstract: A titanium alloy fastener made by: using titanium alloy to make a fastener body subject to a predetermined design, and then applying a heat treatment to harden the fastener body, and then processing the fastener body with a nitrogen treatment to form a titanium nitride coating on the whole surface of the fastener body.

Abstract: The present invention pertains to a screw with a removable tip section comprising a shank and a tip section; wherein the shank has a first threaded section consisted of an upper and a lower threaded sections and a recess defined at the surface of an end face. Furthermore, the tip section includes a second threaded section disposed thereon and an insertion having a coincident shape with the recess. By means of those threaded sections with different outer diameters, the screw is smoothly driven into the metal objects without being interfered in drilling and steadily fixed therein without swing after screwing; After screwing in, the tip section is alternatively removed from the shank by a wrench to be put into the recess to tighten or loosen the screw so as to increase the convenience of using.

Abstract: Disclosed is a screw for hard wood, comprising a screw tip (3) with two cutting edges (5) that extend approximately parallel to each other and perpendicular to the longitudinal axis of the screw. The cutting angle of the cutting edges amounts to about 90°. A centering tip (7) which slightly protrudes from the two cutting edges (5) is embodied in the extension of the longitudinal axis of the screw. Said centering tip (7) prevents the screw from deviating to the side at the beginning of the drilling process.

Abstract: A composite fastener, a belly nut, a tie system and/or a method reduce heat transfer through a building envelope. The composite fastener, the belly nut, the tie system and/or the method secure a wall to a backup structure. The composite fastener is constructed from a fiber reinforced polymer that has fibers embedded in a polymeric matrix. The composite fastener has a low thermal conductive value (k-value) and has non-corrosive properties. The belly nut has a fastening hole on a first side of the belly nut to attach the composite fastener to the belly nut. Further, the belly nut has a pathway to receive a leg of a pintle from a top surface of the belly nut to a bottom surface of the belly nut. The pathway is sized to allow for greater vertical adjustment eccentricity between the belly nut and the pintle without creating large horizontal deflections of the tie system.

Abstract: Disclosed are systems and methods for non-combustible kitchen systems. A rigid frame is coupled to sheet material to form a non-combustible kitchen structure. Various finishing materials such as stone or tile are coupled to the structure. The non-combustible kitchen system exhibits improved resistance to heat and weather damage, such as damage incurred when a user leaves a grill element burning for an extended period of time.

Abstract: The present invention pertains to a screw with a removable tip section comprising a shank and a tip section; wherein the shank has a first threaded section consisted of an upper and a lower threaded sections and a recess defined at the surface of an end face. Furthermore, the tip section includes a second threaded section disposed thereon and an insertion having a coincident shape with the recess. By means of those threaded sections with different outer diameters, the screw is smoothly driven into the metal objects without being interfered in drilling and steadily fixed therein without swing after screwing; After screwing in, the tip section is alternatively removed from the shank by a wrench to be put into the recess to tighten or loosen the screw so as to increase the convenience of using.

Abstract: A screw is provided that includes a head from which a shank extends. The shank has an end section at a distal end that includes a drilling portion. A conically-shaped tip potion is disposed at the distal end of the drilling portion and at least one guiding thread is spirally formed on the conically-shaped tip portion. A cutting edge is defined in the drilling portion by at least one groove formed therein.

Abstract: A clip of fasteners for use in attaching a structural panel to a metal substrate comprises a plastic strip with openings characterized by inwardly-extending ribs for gripping and supporting fasteners that comprise a forward self-drilling portion and a rearward self-tapping thread portion. Each fastener has a head with a top surface adapted for driving engagement by a driver tool for rotatively driving the fastener, and a tapered surface having a plurality of circumferentially spaced cutting edges that function to (a) cut away the ribs supporting the fastener as the fastener is rotatively driven through the structural panel to secure the panel to the substrate and (b) also create a countersink in the structural panel. The cutting edges are formed by provided a plurality of first and second alternately-occurring relief sections in the tapered surface of the, with the cutting edges extending at an acute angle to said shank in a first direction and also in a second direction.

Abstract: A method and apparatus for fastening a first relatively soft structural component such as a wood panel to a second relatively hard structural component such as a steel angle iron using fasteners each having a forward self-drilling portion, a rearward, self-tapping portion, and an outwardly projecting head. The fasteners are driven by a pneumatic rotary impact driver and the method comprises rotatively driving each fastener so as to cause its self-drilling portion to drill a first hole through the wood panel and thereafter rotatively driving and impacting that fastener so as to cause its self-drilling portion to drill a second hole in the angle iron and its self-tapping portion to form a screw connection with the angle iron around the second hole.

Abstract: A screw assembly mainly includes a shank; the shank engaged a recess in the shank; said recess inserted into a tip section, and the tip section inserted into the shank. Besides, the tip section has second threads, which connected to first threads. And the second threads have the same pitch with the first threads so that the first threads easily screwed into a metal objects by rotating the tip section. The second threads with the first threads rotated into the metal object smoothly so that reduces the first threads damaged, and adjusted the screw assembly by engaged a wrench with the recess from underside of the metal objects.

Abstract: A multiple-thread screw includes: a shank having a tapered end portion and a non-tapered portion, the shank defining an axis and a radial plane radiating from the axis; a first spiral thread formed on the non-tapered portion of the shank and having thread turns, each of which has two diametrically disposed points that cooperatively define a diametrical line inclined at a first thread angle with respect to the radial plane; and two second spiral threads formed on the tapered end portion of the shank and twisted in opposite directions. Each of the second spiral threads has thread turns, each of which has two diametrically disposed points that cooperatively define a diametrical line inclined at a second thread angle with respect to the radial plane. The second thread angle is larger than the first thread angle.

Abstract: A self-drilling anchor screw includes a shaft member. A drill bit portion is located at a first end of the shaft member. A threaded shaft portion is located along at least part of the shaft member. A transition shaft portion is located between the threaded shaft portion and the drill bit portion. A nut has nut threads adapted to thread onto the threaded shaft portion of the shaft member. The nut is located on the threaded shaft portion. A sleeve is located about the shaft member. At least part of the sleeve is located adjacent to the transition portion, and is capable of sliding along the shaft member for engaging the transition portion. A nut stop portion is located at a second end of the shaft member. The nut stop portion is adapted to prevent the nut from being unscrewed from the threaded shaft portion at the second end of the shaft member.

Abstract: A power tap structure comprises a screw head, a bolt being a rod body extended underneath the screw head, and at least two screw thread units having different cutting surfaces respectively called a cutting thread and a retaining thread. Each of the crew thread units further includes a plurality of thread sections connected by a transition screw thread. The cutting thread has a plurality of indentations distributed along a cutting thread surface thereon, whereby the indentations on the cutting thread will effectively cut fibers of a material the bolt is being inserted. Therefore, the screw will penetrate the material quickly and easily. Further, an additional thread unit with narrower pitch can be formed right below the screw head for enhancing the locking effect of the screw when it is embedded into the material.

Abstract: A wood screw includes a head and a shank which includes a screw-in portion including a tapered section and a tip point at a distal end of the tapered section. A groove is defined longitudinally in the shank and starts from the tapered section and extends toward the head. A plurality of threads are formed on an outer periphery of the shank including the screw-in portion. A plurality of cutting teeth are formed on the threads on the screw-in portion. A plurality of ribs extend spirally from an outer periphery of the shank and located between the threads.

Abstract: A screw anchor includes a roughly cylindrical body (1) with a drilling portion (3) provided, at its free end, with drilling teeth (14-16), at the other end of the body, a bearing flange (5) and an external screw thread (7). The drilling portion (3) is configured as a portion of a drill bit.

Abstract: A wall plug for enabling fixings to be attached to a wall, the wall plug comprising an elongate body having an inner insertion end and an outer end, a through bore extending from the outer end toward the inner end, the through bore being adapted to axially receive an elongate drill of a setting tool, and body end portion extending axially in-board from said inner insertion end, the body end portion having at least one axially extending recess communicating with an axial end region of said through bore so as to expose a side portion of the setting tool when received in said through bore.

Abstract: A self-tapping screw having a boring part and a threaded shaft for fixing a panel-type object to a preferably metallic substructure is provided. The screw is configured in such a way that it produces a through hole in the panel type object, said hole accommodating the shaft with a degree of play and so that it produces a bore in the substructure into which the thread on the shaft cuts a counter-thread. The boring part includes a boring tip that is located eccentrically in relation to the longitudinal axis of the screw. The tip centers the screw during the positioning operation in such a way that the boring part executes a circular displacement about the boring tip, which expands the through hole to the desired size, whereas the bore in the substructure is produced with the diameter of the boring part.

Abstract: In one aspect, a holder mountable to a friable substrate may include a self-drilling anchor, a wall engaging flange having an opening for receiving a fastener, and at least one leg extending from the flange for holding an object. In another aspect, a holder may include a self-drilling anchor having a drilling portion longer than a drywall thickness followed by a high-threaded portion, a wall engaging flange, and at least one leg for holding an object. In still another aspect, a holder may include a self-drilling anchor having a screw-like drilling portion longer than a drywall thickness followed by a high-threaded portion, a drywall engaging flange having a recess for receiving a rotary driver and a pair of openings each capable of receiving a threaded fastener and engaging threads thereof.

Abstract: A self tapping bolt which fastens a mounting member and a receiving member while the bolt cuts internal threads on an inner surface of a tap drill hole prepared in the receiving member. The bolt includes at least one groove formed near an end of a threaded portion of the bolt and a blade for cutting the internal threads. The bolt includes the feature of the blade being formed only on a rear end surface of the groove relative to a rotational direction of the bolt which is screwed into the tap drill hole.

Abstract: A screw which can be more quickly screwed into a work piece and has better chip-exhausting effect. The screw has a rod body and higher thread and lower thread formed on the rod body. On a conic section of the screw, a cutting thread with another guide angle larger than the guide angle of the lower thread directly extends from the lower thread. Accordingly, the lower thread of the screw has better cuffing, drilling and chip-exhausting function. Alternatively, the screw can have single thread or double threads with equal height. On a predetermined section of the rod body of the screw, a cutting thread with changed guide angle is directly formed as a part of the thread to achieve better cutting, drilling and chip-exhausting function.

Abstract: A fastener adapted for anchoring into a masonry structure, such as a concrete block, employs an epoxy resin system so that the fastener is both mechanically engaged and bonded to the structure. In one preferred configuration, the bead is composed of a hardener, a resin and a nylon powder and has a cardioid-shaped configuration which subtends substantially 360° around the shank at an intermediate position of a threaded portion of the fastener. Various configurations are disclosed, including a fastener wherein adhesive in microencapsulated form is also applied to a lower intermediate portion. In addition, wings may extend from the shank.

Abstract: The reverse barb system for screws and nails includes fasteners that are barbed to prevent backing out once driven into a workpiece or construction material, such as wood. A screw with barbed threads has several barbed thread sections. Each barbed thread section is a section of thread having a leading edge and a trailing edge, the trailing edge defining a barb to increase the screw's resistance to backing out once driven into place. A nail with a barbed point is a nail having one or more barbs formed in the nail's point. Each barb is defined by a leading edge and a trailing edge. The barb's trailing edge forms an acute angle with the longitudinal axis of the nail. The barbs extend from the nail shank to prevent the nail from backing out.

Abstract: A clip of fasteners for use in attaching a structural panel to a metal substrate comprises a plastic strip with openings characterized by inwardly-extending ribs for gripping and supporting fasteners that comprise a forward self-drilling portion, a rearward self-tapping thread portion and cutting blade means formed integral with the self-drilling portion. Each fastener has a head with a top surface adapted for driving engagement by a driver tool for rotatively driving the fastener, and a tapered surface having a plurality of circumferentially spaced cutting edges that function to cut away the ribs supporting the fastener as the fastener is rotatively driven through the structural panel to secure the panel to the substrate and create a countersink in the structural panel.

Abstract: A second material is fastened to a first material by a tapping screw having a male thread. The first material includes a hole and a concave portion around the hole. The hole has a surface in which a female thread is formed as the tapping screw is screwed in.

Abstract: A self-drilling fastener for attaching wood substrates to metal substrates comprises an elongate shank defining an axis, the shank having a first end and a second end. A drilling tip having a drill point and an axial length is formed at the first end. A broad head is formed at the second end. The shank includes a threaded portion and an unthreaded portion. The threaded portion axially extends from the drilling tip towards the head and includes helical threads and has an axial length, a root diameter, and a thread diameter. The length of the threaded portion is greater than the length of the drilling tip. The unthreaded portion axially extends from the threaded portion to the head and has an axial length and a diameter. The length of the unthreaded portion is substantially greater than the length of the threaded portion and the diameter of the unthreaded portion is smaller than the thread diameter of the threaded portion.

Abstract: A multi-part, self-drilling, self-tapping fastener with on board, internal chambered adhesive for, permanently connecting a plurality of parts at an overlaid joint thereof having access from one side. The fastener, that drills its own hole through the joint and taps its own threads for mechanically connecting the parts and subsequently extrudes the adhesive under pressure for optimized joint adhesive infiltration and bonding area for maximizing joint strength. The mechanical fastener holds the parts together eliminating the requirement for holding with auxiliary fixtures allowing the parts to be finished and painted during adhesive cure.