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 building structure including a first building member and a second building member may be connected by a plurality of fasteners, each fastener having a head, a threaded portion having a through hardness of between HRB 70 and HRC 40, a thread-forming portion of at least HRC 50 hardness enabling the fastener to form threads in at least the second steel building member, and a fluted lead portion of at least HRC 50 hardness with a nominal diameter between 70 and 95% of major diameter, such that the fastener is capable of providing a ratio of strip torque to thread-forming torque of at least 3.0 and a ratio of strip torque to drive torque greater than 6.0 when the second steel building member having a thickness of 0.25 inch and the fluted lead portion having at least one diameter within nominal diameter between 80 and 98% of major diameter.

A low energy wood screw that may be inserted quickly and using less energy than conventional screws. In various embodiments, the screw may include a countersunk head having a recess for accommodating a driving tool, a tapered neck, a plurality of crown ribs extending over the head and neck, a lubricating coating, main threads with a large thread lead, and lower threads having an asymmetrical profile and extending onto a gimlet point.

In an impact-driven threaded nail, a thread has a steep lead angle of about 45 in order to attach a material with the nail by hitting a nail head and causing the threaded nail to rotate. When external force is applied in a direction to pull back the attached material from an underlying material, the threaded nail is often slightly rotated in a loosening direction, thereby generating a gap between the underlying material and the attached material, particularly in the case of the attached material being a thin sheet such as plywood. The present invention addresses the problem of providing an impact-driven threaded nail equipped with a means for preventing the above-mentioned loosening. The solution means resides in that a tapered portion of the head of the impact-driven threaded nail on a back-surface side thereof is formed in a pyramidal shape having a regular polygonal cross-section with a diameter decreasing gradually toward the nail shank. By driving the impact-driven threaded nail until an upper surface of the threaded nail head becomes flush with a surface of the attached material, an effect of preventing the threaded nail from rotating is obtained with the aid of both restoration force due to elastic deformation of the attached material and pressing force acting on the regular polygonal surface of the threaded nail head when the attached material is going to be pulled back.

A screw includes a shank extending axially from a head and thread convolutions spirally disposed on the shank. The head has a top surface, a conical surface opposite to the top surface, cutting units extending circumferentially of the top surface, accommodation portions recessedly provided in the conical surface, and ridge portions each located between every two adjacent accommodation portions. The accommodation portions and the ridge portions extend between the cutting units and the shank. Accordingly, the cutting units sever fibers and scrape burrs which incur a ragged edge of a workpiece, thereby preventing the entanglement of unsevered fibers. The ridge portions cut fibers into chips and guide chips to the accommodation portions for suitable accommodation of chips inside the accommodation portions, which attains a tight engagement between the screw and the workpiece, reduces screwing resistance, and allows the top surface to fit level with a surface of the workpiece.

A screw includes a shank defining an exposed surface portion, a head and a drill section disposed at two opposite ends of the shank, and thread convolutions spirally disposed in a spiral direction and axially spaced apart. Each thread convolution has an upper thread flank and a lower thread flank. A groove is recessedly formed in the surface portion and extends annularly in the spiral direction, and a plurality of slots are recessedly formed in the surface portion and extends axially from at least one lower thread flank to meet the groove. Accordingly, the groove and the slots are adapted to enlarge spaces for moving and accommodating chips, thereby attaining a quick removal of chips, reducing screwing resistance, and accelerating a screwing operation. The accumulation of remaining chips within the groove and the slots facilitates a tight engagement between the screw and a workpiece and attains an anti-loosening effect.

A screw includes a shank extending axially from a head and thread convolutions spirally disposed on the shank. The head has a top surface, a conical surface opposite to the top surface, cutting units extending circumferentially of the top surface, accommodation portions recessedly provided in the conical surface, and ridge portions each located between every two adjacent accommodation portions. The accommodation portions and the ridge portions extend between the cutting units and the shank. Accordingly, the cutting units sever fibers and scrape burrs which incur a ragged edge of a workpiece, thereby preventing the entanglement of unsevered fibers. The ridge portions cut fibers into chips and guide chips to the accommodation portions for suitable accommodation of chips inside the accommodation portions, which attains a tight engagement between the screw and the workpiece, reduces screwing resistance, and allows the top surface to fit level with a surface of the workpiece.

A fastener installation tool and related method are provided for installing fasteners in boards, where the boards are installed immediately adjacent one another, without a gap established therebetween. The tool can include an alignment projection that projects a preselected distance downwardly from a lower surface of the tool. The alignment projection can be disposed between opposing corners of first and second boards to install a fastener without establishing a gap between the boards. This construction can be suitable for installing boards constructed from materials that shrink over time, such as wet, treated lumber or other materials, and even non-shrinkable boards where tighter spacing is desired. A related method of installation is provided.

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.

A building block structure includes a joint adaptor unit and at least one connection bar. The joint adaptor unit includes one or multiple joint adaptors, each of which includes at least one screwing connection end that includes a right/left-hand combined threaded hole formed therein. The right/left-hand combined threaded hole includes multiple right-handed screw troughs and multiple left-handed screw troughs that are alternately arranged. The connection bar has one end having multiple spaced right-handed external threads and an opposite end having multiple spaced left-handed external threads. As such, when the connection bar is rotated in a given direction, the right-handed external threads and the left-handed external threads are simultaneously screwed into the right/left-hand combined threaded holes of two oppositely facing joint adaptors. Through rotation in an opposite direction, the right-handed external threads and the left-handed external threads are simultaneously disengaged from the right/left-hand combined threaded holes.