An anti-pullout and low-resistance screw includes a shank, a screw-in portion, a head portion, and a thread. The thread is helically formed around both the screw-in portion and the shank and includes a plurality of thread convolutions. Each thread convolution includes an upper tooth surface facing the head portion and a lower tooth surface facing the screw-in portion. At least one tapered pressing structure is designed on the screw-in portion and/or the shank to define at least one section with its outer diameter tapering towards the screw-in portion gradually. The tapered pressing structure extends from a bottom edge of the lower tooth surface along a longitudinal axis of the shank. The lower tooth surface has a lower tooth surface height that is greater than the thread height. An annular anti-pullout plane is formed on the shank between two adjacent thread convolutions to enhance the anti-pullout strength of the screw

A self-tapping screw includes a screw head, a screw shank having a shank body extending from the screw head along an axis, a self-tapping thread extending helically around an outer peripheral surface of the shank body and having a plurality of cutting edges continuously connected to one another and extending outwardly, radially and taperingly from the outer peripheral surface of the shank body, and a supporting unit including a plurality of supporting teeth each disposed between two adjacent ones of the cutting edges, and a plurality of concave surfaces respectively adjacent to the supporting teeth and extending inwardly from the outer peripheral surface of the shank body.

A screw includes a head and a shank extending from the head and defining a longitudinal axis. A thread is provided on the shank. The head includes a top portion and a cone portion located between the top portion and the shank. A plurality of recesses is provided in a peripheral surface of the cone portion and spaced in a circumferential direction of the cone portion. Each recess includes first and second side edges opposite to each other in the circumferential direction and an upper edge connecting the first and second side edges. The first side edge features a maximum recess depth greater than a maximum recess depth of the second side edge. The top edge extending in the circumferential direction of the cone portion is partially arranged between the top portion and the first side edge of an adjacent recess in the longitudinal axis direction.

A thread-forming screw which is provided in particular for thin, perforated sheet metal contains a threaded shank which below the screw head is initially configured so as to be cylindrical and then continues to a conical forming portion. The screw shank within the forming portion has a rib forming an incomplete counter thread.

A screw structure is disclosed herein. It comprises a head; a rod body integrally extended from the head and having a flat shank part and a tapered tip at a terminal of the flat shank part; a first screw thread disposed on the rod body and having a positioning tooth at a terminal thereof, a plurality of cutting units and a plurality of shaving collection spaces; a plurality of second screw threads disposed on the rod body; and a reamer thread disposed at an upper end of the rod body.

A combined thread forming and thread locking fastener is disclosed. A fastener includes three thread zones. A first thread zone utilizes a first thread forming thread profile with an increasing outer diameter. A second thread zone extends from the end of the first zone utilizing the first thread forming thread profile and continues with a constant diameter. The third thread zone utilizes a thread locking thread profile continuing along substantially the remainder of the shaft of a fastener.

This fastening component, which is intended to assemble a first part and a second part, includes a body extending longitudinally along an axis, a head configured to allow the fastening component to be rotated about the axis, and a tip connected to the body. The body has a side wall including fastening means configured to fasten the body to the first and second parts. The tip has a side wall having a shape different from that of a surface of revolution. The tip and the body are connected by a cleavable area configured to be broken in order to detach the tip from the body.

The invention relates to a screw for cutting a thread into a component, having a shank which at least in portions is provided with a thread, a screw head having a drive configuration, the latter being adjoined by the shank, wherein, proceeding from an end of the shank that is opposite the head, first a cutting portion and then a holding portion are disposed, wherein the cutting portion and the holding portion are provided with a thread, wherein the holding portion has a larger external diameter in relation to the cutting portion, characterized in that a truncated-cone-type intermediate portion that is provided with a thread is disposed between the holding portion and the cutting portion, and in that the cutting portion has a truncated-cone-type attachment portion.

A screw includes a head and a shank extending from the head and defining a longitudinal axis. A thread is provided on the shank. The head includes a top portion and a cone portion located between the top portion and the shank. A plurality of recesses is provided in a peripheral surface of the cone portion and spaced in a circumferential direction of the cone portion. Each recess includes first and second side edges opposite to each other in the circumferential direction and an upper edge connecting the first and second side edges. The first side edge features a maximum recess depth greater than a maximum recess depth of the second side edge. The top edge extending in the circumferential direction of the cone portion is partially arranged between the top portion and the first side edge of an adjacent recess in the longitudinal axis direction.

A screw has a screw head and a shank extending downwardly from the screw head. The shank has a threaded segment, a cutting segment, and a tapered segment sequentially arranged downwardly, a thread spirally surrounding an external surface of the shank from the threaded segment to the tapered segment, multiple cutting ribs arranged around the external surface of the shank on the cutting segment of the shank, and multiple chip recesses formed between the cutting ribs. Each of the cutting ribs has a rounded crest to enlarge a drill hole and to reduce a resistance formed between the cutting ribs and the workpiece during drilling. The screw can be easily screwed into the workpiece with less driving force.