A metal anchoring fastener fastens millwork onto walls constructed with wall cladding fastened to steel studs. The load typical of a loaded cabinet is borne by the steel stud anchors owing to the mate between the profile of the steel stud anchor and the layers of millwork and wall cladding and steel stud that said anchor penetrates. The pitch of the thread adorning the profile of the steel stud anchor progresses non-linearly along the length of said shaft, the shaft is generally non-linear in profile, and the thread profile is non-uniform along the length of said shaft. The anchor can also support a secondary screw concentrically penetrating the void at the center of the anchor, in order to hang loads from a wall, with or without millwork. Predrilling of the holes can enable installation of these zinc anchors.

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 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.

The present invention provides a fastening element for increasing fixing stability, the fastening element having a drill part formed at the bottom tip of the lower end of a fixing piece so that a fixing groove can be easily formed by means of the drill part when the fixing groove is formed on a structure, wherein one side of the drill part is formed to be pointed and the other side thereof is formed to be blunt so that the fastening element is easily screw-fastened to the fixing groove of the structure and, simultaneously, can be prevented from being loosened by external vibration and the like. The present invention has a protruding part protruding downward from the lower surface of a flange, so that the protruding part is pressed and fixed to the upper surface of the structure so as to enable the fastening element to be more firmly fixed to the structure. In addition, a polygonal upper flange is formed on the upper surface of the flange, and thus a fastening part or the upper flange of the fixing piece is fastened using a wrench and the like, so that the fastening element can be easily fixed onto the structure.

A fastener has a generally cylindrical shank and a driver at a first end of the shank. The shank has a thread having a first side and a second side opposed to the first side. The first and second sides form a compound angle between the shank and an apex where the first and second sides meet. The compound angle is formed by a body portion extending along the first and second sides from the shank to an intersection, and a crest portion extending along the first and second sides from the intersection to the apex. The first and second sides in the body portion form a body angle with respect to each other, and the first and second sides in the crest portion form a crest angle with respect to each other. The crest angle is greater than the body angle.

The invention relates to a wood screw having a screw head having a drive configuration, a screw shank which emanates from the screw head and which at least in portions is provided with a thread, and a drilling tip which adjoins the thread, wherein the drilling tip is configured without a thread, wherein the drilling tip has two longitudinal cutters which continue up to a terminal point of the drilling tip and which run so as to be curved in relation to a central longitudinal axis of the screw, and wherein a circumference of the drilling tip between the two longitudinal cutters does not have any further cutters.

A screw having a shank, wherein the shank has a tip end, a rear end, and a longitudinal axis extending through the tip end and through the rear end, wherein the tip end and the rear end are opposite ends of the shank, and a screw thread, which is connected to the shank, and which winds around the shank, wherein a wedge groove is provided in the shank, which wedge groove winds around the shank and extends alongside at least a section of the screw thread, wherein the wedge groove is delimited by a rearwardly tapered wedge flank for wedging a grout shell surrounding the shank. The screw thread extends further towards the rear end of the shank than does the wedge groove.

A screw having a shank, wherein the shank has a tip end, a rear end, and a longitudinal axis extending through the tip end and through the rear end, wherein the tip end and the rear end are opposite ends of the shank, and a screw thread, which is connected to the shank, and which winds around the shank, wherein a wedge groove is provided in the shank, which wedge groove winds around the shank and extends alongside at least a section of the screw thread, wherein the wedge groove is delimited by a rearwardly tapered wedge flank for wedging a grout shell surrounding the shank. At least one ridge is provided within the wedge groove, wherein the ridge compartmentalizes the wedge groove.

The present disclosure relates to a drive screw for connecting a carrier formed of foamed material to a part to be affixed to the carrier. In one implementation, the drive screw includes a threaded pin with a first end having shaped elements configured to connect to a tool that transfers torque and a second end configured to penetrate into the carrier. In addition, the first end of the threaded pin may be surrounded by and connected to an interlock component, and the part to be affixed may have an interlock receiving space corresponding to the interlock component.

Described is a masonry fastener, comprising: a shank having a first and second portions and a first and second end, the shank having ductility measured as the bending angle under complete three repeated cycles without rupture of between about 10.0° and 22.0°; the first portion having a tapered helical screw portion along a predetermined longitudinal length thereof, the tapered helical screw portion commencing at a tip of the first end thereof and ending at an end of the second portion; and the second portion having a tapered helical screw portion along a predetermined longitudinal length thereof, the tapered helical screw portion commencing at an end of the first portion and ending at the second end.