A façade comprises a façade panel, a hanger and a fastener extending through the hanger into a blind hole provided at the façade panel. The fastener comprises a shaft defining a fastening direction and has a front face facing in the fastening direction for penetrating the façade panel and a back end facing in a direction opposite to the fastening direction, and a head arranged at the back end and having a bearing surface facing in the fastening direction for bearing on the hanger. The front face has an outer edge at an outer circumference of the shaft and a recess falling short in the fastening direction with respect to the outer edge.

A multifunctional fastener is provided which is easy to install and combines a screw, and a washer and/or a wing assembly. The multifunctional fastener may include a fastener head. A threaded portion may extend longitudinally and distally of the fastener head. A fastener washer may be disposed between the fastener head and the threaded portion, and may extend radially outward of the fastener head. The wing assembly may include at least one fastener wing extending radially outward from the fastener head, and preferably radially outward of the fastener washer. A torque-applying tool connector may be provided in the fastener head. The torque-applying tool connector may be configured for engagement with a torque-applying tool such as a manual screwdriver or electric drill screwdriver to facilitate rotation of the threaded portion via the fastener head.

A cement board screw a high thread that begins on the tapered end, extends onto the shank and terminates at a second axial location along the shank. The high thread defines a high peripheral edge, where a leading flank and a trailing flank meet at the high peripheral edge and together define a high thread angle that is between about thirty degrees and about fifty-five degrees. A low thread begins on the tapered end, extends onto the shank and terminates substantially at a first axial location along the shank such that an axial length of the low thread is less than an axial length of the high thread. The low thread includes a leading flank and a trailing flank that meet at a low peripheral edge and together define a low thread angle that is between about fifty degrees and about seventy degrees.

A self-drilling screw includes a leading section having a drill body and opposite discharge grooves formed on the drill body. The drill body and the discharge grooves meet at cutting edges. On the drill body are formed two blade portions connected to the cutting edges and tapering at respective second tips. The blade portion has a second included angle of not more than 50 degrees. Between the blade portions is formed a drilling portion terminating at a first tip and having a first included angle of not more than 60 degrees. Two opposite concave surfaces each extend from the drilling portion to each blade portion. The first tip and the second tips are situated at different places. Accordingly, the end of the leading section presents a shape of a curved bow riser to cut quickly and help quick removal of chips, thereby decreasing resistance and preventing the cracking problem.

A self-penetrating thread forming and flow drilling fastener for thick materials with a generally cylindrical partially threaded shank, a drive system at the first end of the shank and a flow drilling tip at the second end of the shank. The flow drilling tip is sized larger than the minor diameter of the threaded shank but less than the major diameter to control installation torque enabling installation into thick materials with greatly reduced risk of torsional failure resultant from a decrease in torque. The flow drilling tip and threads may be a variety of shapes or thread types based on the substrate material the fastener is installed into.

A screw fastener comprising: an elongate shank (3) having a screw thread (9) extending along at least a substantial portion of the shank; a drive section (7) located at one end of the shank for allowing the screw fastener to be rotatably driven into one or more material layers; and a self-drilling or piercing point (5) at an opposing end thereof for forming a bore in said one or more material layers; wherein the drive section is shaped to minimise or avoid the need for countersinking of the formed bore.

A structural screw usable in multiple different substrates/materials includes a head end, a shank and a tapered end, the head end including a tool engaging part, the head end located at a first end of the shank and the tapered end located at a second end of the shank. A thread is formed along the shank, wherein the thread begins on the tapered end, extends onto the shank and terminates at a first axial location along the shank that is spaced from the head end. The thread (i) is a multiple start thread formed by at least a first helical thread and a second helical thread and/or (ii) includes a thread angle of between fifteen degrees and thirty degrees. The screw may also include a reaming section with leading and trailing wedge sections and/or an asymmetric notch pattern along at least part of the thread edge.

A faceted lobular threaded component and methods for making and/or installing the same. A faceted lobular threaded component may include a head, and a shank extending along a longitudinal axis away from the head. The component may also include an external faceted lobular thread in the shank extending around the longitudinal axis. The external faceted lobular thread may include at least four facets per thread revolution, and at least four lobes per thread revolution circumferentially interspersed between the at least four facets and established by the at least four facets.

A screw includes a shank, a first thread, and a second thread. The shank includes a screw-in portion, a head portion, and a straight rod portion between the screw-in portion and the head portion. The first thread surrounds the shank spirally and includes an upper thread portion formed around the straight rod portion, a lower thread portion formed around the screw-in portion, and a middle thread portion continuously connected between the upper and lower thread portions. A plurality of serrate cutting teeth is provided on the middle thread portion of the first thread. The second thread is helically formed around the screw-in portion of the shank and includes a plurality of thread convolutions spaced from thread convolutions of the lower thread portion of the first thread. The screw can be quickly driven into articles to be joined without degradation of binding capacity between the screw and the articles.

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.