A floating connection fastening system employs a semi-flexible floating bushing having a sleeve with an axial slot which captures a fastener having a head, an unthreaded shank portion, a threaded portion and an intermediate reamer. An adapter mounts to the bushing/fastener assembly and receives a driver bit. The adapter defines an offset clearance. The floating connection is installed by driving the fastener through a non-load bearing member so as to form a bore and embed the fastener into a load bearing member. The floating bushing has a flange which engages the surface of the non-load bearing member. The installation may be performed in essentially a one-step procedure.

A floating connection fastening system employs a semi-flexible floating bushing having a sleeve with an axial slot which captures a fastener having a head, an unthreaded shank portion, a threaded portion and an intermediate reamer. An offset cap mounts to the bushing/fastener assembly and receives a driver bit. The offset cap defines an offset clearance. The floating connection is installed by driving the fastener through a non-load bearing member so as to form a bore and threadably engage a load bearing member. The floating bushing has a flange which engages the surface of the non-load bearing member, and the sleeve is entirely received in the formed bore. The offset attachment functions to provide a clearance so that upon termination of driving the fastener, the head of the fastener sits proud relative to the non-load bearing member. The installation is accomplished in essentially a one-step procedure.

Disclosed herein is a fastener for preventing free spinning action during the fastening process, in accordance with some embodiments. Accordingly, the fastener may include a fastener head and a fastener body. Further, the fastener head may include a top head surface and a bottom head surface. Further, the bottom head surface may be characterized by a bottom surface area. Further, the fastener body attached to the fastener head. Further, a first body end of the fastener body may be attached to the bottom head surface. Further, a first end cross-sectional area of the first body end may be less than the bottom surface area. Further, the fastener body may include a first body portion and a second body portion. Further, the first body portion is proximal to the first body end. Further, the second body portion proximal to a second body end of the fastener body.

A composite screw includes a tapping end portion that includes a circular bottom surface, a peripheral surface and a main thread. The peripheral surface extends from the circular bottom surface. The main thread is formed around the peripheral surface. A reception recess is recessed from the circular bottom surface and the peripheral surface. The main thread has a discontinuation where the reception recess opens at the peripheral surface. A rigid body and a weld material fill the reception recess. The rigid body has an outer surface and an auxiliary thread. The outer surface is exposed from the reception recess. The auxiliary thread is formed on the outer surface and connected to the main thread to fill the discontinuation.

A first and second electric members respectively having electrical connection portions are electrically connected in a state that mutual positions are regulated by guide pins, and fastening screws which are inserted through fastening screw insertion holes of the second electric member are screwed into screw holes for fastening of the first electric member, and thereby the first and second electric members are fastened. At least one of the screw holes for fastening has large-diameter portions into which the guide pin is detachably inserted, and small-diameter portions equipped with female screw portions. The female screw portions are not arranged in the large-diameter portions, and inner diameters of the large-diameter portions are larger than root diameters of the female screw portions, and outer circumferential surfaces of the fastening screws which are screwed with the female screw portions and inner circumferential surfaces of the large-diameter portions are not in contact with each other.

Various embodiments of a fastener driveable into a substrate are provided. The fastener includes a head, a shank, and a helical thread formation. Portions of the shank and helical thread formations may be tapered. The outer diameter of the shank may decrease in a direction away from the head. An outer diameter of the thread formation may increase in a direction away from the head. The head may include a plurality of extending ribs. The helical thread formation may be formed with a plurality of grooves that are respectively each partially defined by a straight cutting edge. These improvements reduce torsional failure of the fastener from over tightening.

A method for producing a composite screw includes: providing a screw body a circular bottom surface, a peripheral surface and a main thread; processing the screw body to format least one reception recess indented upwardly from the circular bottom surface and inwardly from the peripheral surface; providing at least one composite unit including a weld material and a rigid body of high stiffness material; disposing the weld material in the at least one reception recess and subsequently inserting and moving the rigid body into the at least one reception recess; and melting the weld material to secure the rigid body to the screw body.

A screw has a shaft section which extends axially, a screw thread at the shaft section, which screw thread has thread turns that extend radially starting from the shaft section, a screw tip section which connects to the shaft section, at least one first scraping edge at the screw tip section, and at least one second scraping edge in a region of the shaft section adjacent to the screw tip section. The at least one first scraping edge and the at least one second scraping edge are spaced at a distance from each other and extend in an axial direction over different areas of the screw.

A self-tapping screw includes a shank having a rear end provided with a drilling tip and an external thread. The external thread has a top formed with a stop flange. The stop flange has a diameter greater than that of the external thread. Thus, the shank is integrally formed with the stop flange by two threading dies, to stop a further movement of the external thread, and to prevent the external thread from being fed and locked excessively, thereby preventing the shank from being worn out or broken during operation.

An installation tool/fastening system employs an installation tool which is adapted for fastening a top plate to a roof support member or other structural connections and is particularly adapted for use in driving a wide variety of fasteners. One installation tool embodiment is adapted for driving a fastener having a head with a maximum diameter greater than the major diameter of the fastener threads. The installation tool is also adaptable to drive fasteners having a wide variety of drive-type head configurations including an external drive head and various recessed or socket configurations provided in the fastener head.