Abstract: A screw includes a shank having a tip, a rear end which is disposed opposite the tip, and a longitudinal axis which extends through the tip and through the rear end. The shank consists of a first steel material. A screw thread helix is disposed on the shank and protrudes from the shank. The screw thread helix consists of a second steel material that is different from the first steel material. Both the first steel material and the second steel material are stainless steels.

Abstract: A bone anchor includes a shank having a longitudinal axis, a core, a tip at one end of the core, and a thread forming a helix that extends around the core with a lower flank directed towards the tip and an upper flank directed away from the tip. A recess in a first turn of the thread forms a cutting structure, the recess being defined by first and second surfaces directly connected to one another at an angle. The first and second surfaces are spaced apart from every other turn of the thread above or below the first turn. A majority of the first surface is positioned higher axially than and circumferentially aligned with part of the second surface. At least one of the first or second surfaces extends circumferentially around the shank by a greater distance than an axial height of the at least one surface.

Abstract: Provided is an invention relating to a bolt having a crushed portion of a ridge formed on a regular threaded portion of the bolt. The crushed portion of the ridge is set to have a height at which no screwing torque is generated when the bolt is screwed into an internal thread, and the crushed portion of the ridge is formed on an entire half-circumference or a partial half-circumference of the regular threaded portion so as to form a spiral shape that advances toward a shaft tip in a direction opposite to the ridge of the regular threaded portion when viewed from a head. The bolt of the present invention is used as a locking bolt or an earth bolt.

Abstract: A wood screw includes a head, a shank axially extending from the head, a main thread extending helically around the shank in a tightening direction and having an outer diameter ranging from 3 to 16 mm, and a plurality of forward ribs extending spirally around the shank in a same direction as the main thread. The number of the forward ribs ranges from three to five. Each forward rib, in a cross section thereof, has a first outer edge facing the tightening direction, and a second outer edge facing opposite the tightening direction and having a length shorter than that of the first outer edge. Each forward rib has a height smaller than that of the main thread, and a lead angle greater than that of the main thread.

Abstract: The invention relates to a fastener comprising a substantially right circular cylindrical surface arranged along an axis, said surface comprising a grooved shape selected from a thread, a tapping and a plurality of traction grooves, said fastener being made of a beta-metastable titanium alloy. The alloy has a microstructure (40) made up of a matrix (42) and alpha phase nodules (44) distributed in said matrix, the matrix being made up of beta phase and groups (46) of alpha phase lamellae (48) oriented in the same direction.

Abstract: [Problem] The purpose of the present invention is to provide an anti-loosening metallic male screw that can exhibit a sufficient anti-loosening effect by forming a flat part and a short slope in a part of the thread bottom of the male screw and thus ensuring pressure contact between a thread peak of a female screw and the slope at the thread bottom of the male screw.

Abstract: A self-tapping screw (10, 30) comprising a drive (12) and a shank (14) bearing a thread comprising a main thread (16, 32), wherein the main thread (16, 32) has a maximum main thread external diameter (DAF) and a cutting area (F) and a supporting area (T) following in the direction of the drive (12), wherein the shank (14) has a threaded end (18) at an end opposite the drive (12), with the screw end (18) having a diameter (DE) of at least 20% of the maximum main thread external diameter (DAF), The shank further has, in the region of the screw end (18), a tap flute (20), wherein the tap flute (20) comprises at least two tapping thread turns (20a, 20b, 20c) which attain, in their external diameter (DAA), no more than 90% of the maximum main thread external diameter (DAF) and form a tap region in which the tapping thread turns (20a, 20b, 20c) have the same diameter development, and in addition in that the diameter of the main thread (16, 32) in the tap flute region (AB) is less than or equal to the diameter (DAA)

Abstract: The invention provides a low-wear screw structure which comprises a screw head, a rod body, a first thread and at least a crushing rib, wherein the rod body extending out from the screw head and being successively formed with a rod extension part, a reaming part and a taper part, the first thread being annularly arranged on an outer peripheral surface of the rod body at a distance from the taper part to the rod extension part through the reaming part, the crushing ribs being arranged on the rod body at the reaming part, wherein a first included angle is formed between the first side surface and the outer peripheral surface of the rod body, a second included angle is formed between the second side surface and the outer peripheral surface of the rod body, and the first included angle is different from the second included angle.

Abstract: An implant for insertion within a maxillofacial bone of a patient including a tapered body and one or more threads formed along the body. The one or more threads on one or more lead threads include multiple thread forms including both three-dimensional stabilization thread and standard thread (e.g. v-thread, buttress thread, etc.) forms. The one or more threads including the multiple thread forms provides for maximizing the restriction of lateral movement of the implant within a full or partial osteotomy.

Abstract: The present disclosure provides an anti-loosening screw pair and an anti-loosening screw component. The screw pair includes a first screw component provided with a first screw thread and a second screw component whose outer wall surface is provided with a second screw thread. The first and second screw components are in threaded connection. In a direction of the first screw component being screwed into the second screw component, sides of the first and second screw threads pressing against each other are formed into force-bearing fitting faces respectively, and opposite sides thereof are formed into non-force-bearing fitting regions respectively. At least one of the force-bearing fitting faces and the non-force-bearing fitting regions of the first and the second screw components is provided with a stopper so as to prevent radial displacement between the first and the second screw components.

Abstract: A screw capable of reducing drilling torque includes a shank provided with cutting threads, and a head and a drilling portion respectively formed at two ends of the shank. Each cutting thread has two opposite flank surfaces converging at a thread crest. On the thread crest are recessedly formed notches alternating with grooves. Each groove has an upper crest edge and a lower crest edge meeting the flank surfaces respectively. Each notch has a first cutting edge and a second cutting edge meeting the flank surfaces respectively. The above cutting edges and crest edges cooperate to provide multiple cutting points, thereby increasing the cutting efficiency, preventing the improper entanglement of fibers, and reducing drilling torque for easier screwing. The notches and grooves accommodate and press partial debris for achieving a stable and tight engagement between the screw and an object and increasing the ability of resisting the pulling-out force.

Abstract: A screw includes a head and a shank extending from the head to terminate at a frusto-conical tip portion. A first thread section has asymmetric upper and lower thread surfaces, a plurality of V-shaped notches formed at a juncture of the surfaces, and a fillet surface formed at a juncture between the shank and the upper thread surface. Two second thread sections are disposed adjacent to each other and spaced apart from the first thread section. A third thread section extends from the first thread section toward the tip portion and has an outer surface of an arc-shaped cross-section. The screw-in movement of the screw is guided by the third thread section to prevent the screw from being slanted relative to a concrete object.

Abstract: A screw having a cylindrical shank with a conical tip at one end and a screw head at the other, and at least one thread section therebetween. The thread section has a thread core. On the thread section, multiple successive thread terms are formed on a shell surface of the thread core. In the region of the thread section, multiple elevations are arranged on the outside of the shell surface of the thread core.

Abstract: A bolt including a head portion, a shaft portion, and an external thread formed in the shaft portion, the bolt having: a plurality of thread collapsed rib portions each of which is composed of projecting portions that are arranged in a longitudinal direction of the shaft portion, each projecting portion being formed by collapsing a top portion of a screw thread of the external thread and by raising both sides of the collapsed top portion of the screw thread, wherein one projecting portion of the thread collapsed rib portion has a shape different from that of another projecting portion that is adjacent in a circumference direction of the screw thread of the adjacent thread collapsed rib portion in the shaft portion, such that an interference position with a counterpart internal thread varies in accordance with screw-engagement with the counterpart internal thread.

Abstract: Screw connection, in particular, a tension clamp, and method of forming the screw connection. The screw connection includes a screw having a screw head and an external thread with a thread turn profile and a thread axis, and a mating thread element having an internal thread, matched to the external thread, with at least one thread groove bordered by thread flanks to screwably receive the screw. A geometrically defined deformation of the external thread is arranged at a predetermined distance from the screw head to collide with at least one thread flank during the screwing of the screw into the mating thread element.

Abstract: A rotary cutting tool including a cutter member having an axial forward end and an axial rearward end. A cutting region is at the axial forward end of the cutter member, and a male threaded portion is adjacent the axial rearward end of the cutter member. A shank member has an axial forward end and a shank bore opening at the axial forward end. The shank bore has an axial shank bore length. The shank bore contains a female threaded portion and an axial rearward shank bore portion axially rearward of the female threaded portion. The axial rearward shank bore portion has a terminal end. When the male threaded portion of the cutter member fully engages the female threaded portion of the shank member, the axial rearward end of the cutter member being spaced a first distance axially forward of the terminal end of the axial rearward shank bore portion.

Abstract: A semi-circular male alignment feature elastic averaging alignment system utilizing a plurality of semi-circular male alignment features which interface by elastic averaging with a plurality of female alignment features, wherein semi-circular male alignment features of a first component are received during a mating process by respective female alignment features formed in a second component, whereby precise alignment of the first and second components and stiffness are provided by elastic averaging of the male and female alignment features.

Abstract: A novel loosening prevention threaded fastener in which a clearance side protrusion portion protruding radially outwardly toward a clearance flank surface of a female screw thread is formed on a clearance flank surface of a male screw thread, and the clearance side protrusion portion is constructed such that a tip end portion thereof interferes with the clearance flank surface of the female screw thread, in a state where a pressure flank surface of the male screw thread is in contact with a clearance flank surface of the female screw thread. At the time of screw fastening, the crest end portion of the clearance side protrusion portion is pushed to the pressure flank surface of the female screw thread so that it is deformed in a deflective manner to apply a predetermined contact pressure to a contact surface due to its elastic restoring force, thus providing resistance against a loosening direction.

Abstract: A bone screw comprises a threaded portion. The threaded portion has a first thread including a first front surface (11), a first back surface (12) and a crest. A second thread including a second front surface (16) and a second back surface (17) is formed on at least part of the crest of the first thread. Because of the presence of the second thread, a contact area between the screw and a bone and an axial pullout force-bearing area are both significantly increased, without significantly influencing the bending resistance, so that the mechanical property of the screw is entirely improved.

Abstract: A spiral body lock including a mandrel; a sleeve; and at least one of the mandrel and sleeve including a male component, the other of the mandrel and the sleeve including a recess receptive to the male component at least one of the recess and the male component being helically configured and method.

Abstract: A threaded fastener having a threaded portion with a ratio of pitch diameter to minor diameter less than 1.28, and the threaded portion with a major diameter portion, a leading flank having a normal angle between 10° and 60°, a trailing flank having a normal angle between 1° and 30°, and a shank portion extending between the trailing flank and the leading flank of adjacent threads of a arcuate surface having a radius greater than the thread height. The arcuate surface forming the shank portion may have a radius between 1.2 and 1.8 times the thread height.

Abstract: A self-locking threaded connection including an externally threaded male part having a hollow center and a series of cooperating members; and an internally threaded female part having a series of cooperating members; the cooperating members consisting of projections and detents. As the parts are threaded together, the reception of the projections into the detents produces both audio and tactile responses indicating that the connection is made and near a destructive over tightening.

Abstract: It is possible to prevent a screwing torque from becoming excessively high even when a screw is threadedly engaged into a deep guide hole. In a tapping screw 100 comprising a parallel screw 22, a taper thread 23 provided closer to a tip end of the tapping screw than the parallel screw 22, and a plurality of projections 30 which partially project along an apex and flanks on both sides of a screw thread and which form an internal thread on a surface of a guide hole formed in a to-be fastened member, the plurality of projections 30 are provided from a region where the taper thread 23 is provided to a portion of a region where the parallel screw 22 is provided, and a diameter of a virtual cylinder which comes into contact with tip ends of some of the projections 30 including a projection provided in a region where the parallel screw 22 is provided is larger than an outer diameter of a external thread of the parallel screw 22.

Abstract: A fastener assembly includes a male threaded fastener and a washer captured between a head of the fastener and a thread of the fastener. A terminal portion of the thread adjacent the washer is provided with crest depressions to thereby form material of the thread run out into elevations of the thread between adjacent depressions, to thereby maintain the specified major diameter of the thread adjacent the washer.

Abstract: A threaded element of plastic material for a joining assembly has a uniquely formed thread profile of a small profile angle between 30° and 50° and a rounded crest of a relatively large radius of curvature. The gap between the revolutions of the thread is of a volume which exceeds that of the thread. In order to provide for a specific cutting geometry of the thread profile the threaded element comprises a plurality of angular segments which are radially offset with respect to each other such that adjacent angular segments provide cutting edges. Furthermore, a tool and a method for making such a joining assembly are disclosed.

Abstract: A fastener is provided including an elongated body having a first end and a second end, and a helical thread formed on at least a portion of the elongated body where the thread has a crest, a root, and flank portions. The helical thread has at least one protrusion extending from the crest and flank portions toward the first end of the elongated body, and each protrusion has a peak that extends to the root of the thread.

Abstract: The thread form can provide a controlled thread stiffness which can more evenly distribute loads and can be less sensitive to changes in relative pitch. The controlled stiffness of the thread can provide a desired cantilever bending of the thread under assembled load. The thread form can utilize a traditional thread form at and/or above the pitch diameter, thereby maintaining the area of contact close to that of a standard thread form. Standard gaging implements can be used to ascertain the thread pitch and for quality control. The thread form includes a side extending between the crest and the root. The side has a first portion extending from the crest toward the root and the second portion extending from the first portion toward the root. The first and second portions extend toward the root in different orientations relative to the thread.

Abstract: A threaded fastener includes a shank having a tip and a head configured for engagement by an associated driving tool. The fastener is configured for use with an associated threaded opening. The head is disposed on the shank opposite the tip. The shank has a helical thread formed thereon. The thread extends from about the tip to about the head and defines a plurality of zones. Each zone has a plurality of individual threads extending 360 degrees about the shank. A leading thread in each zone is formed with a wave-form profile having an amplitude that is greater than the amplitude of each prior leading thread. In one embodiment, threads other than the leading thread in each zone do not have an amplitude as great as their respective leading threads. A fastening assembly is also disclosed.

Abstract: An elasticity limit (limit of yieldingness resistance) of a fastened member (bolt's seat face) increases (an elasticity area expands) due to a plastic deformation of the fastened member by fastening a bolt in an initial fastening step, and the plastic deformation (yieldingness) of the fastened member is properly prevented from progressing even if a thermal stress acts after a final fastening step. Thus, decrease of a fastening shaft force of the bolt can be prevented properly despite removal of the thermal stress.

Abstract: A plumbing fixture that includes a threaded connection, including a male part having external threads and a female part having internal threads associated with one or more protrusions interspaced such that when the female and male parts mate together, the protrusions on the male part deformably interfere with the protrusion on the threads of the female part to resist loosening of the threaded connection.

Abstract: A thread locking fastener assembly comprising a nut anchor defining an internal thread having a longitudinal axis, a leading face and a trailing face, the internal thread, in axial section, having a profile which is symmetric about a first imaginary line extending radially out from the axis, and a fastener shank having an external thread with a longitudinal axis, a leading face and trailing face, the external thread being received in said internal thread so that said axes are substantially coincident. The external thread, in axial section, has a profile with a radially inner base zone which is symmetric about a second imaginary line extending radially from the shank axis and a radially outer deflectable addendum which is not symmetric about that line so that the addendum prevents axial centralization of the external thread profile in the internal thread profile unless a sufficient axial force is applied to the shank to deflect the addendum.

Abstract: The present invention relates to a u-bolt comprising, a shaft having a curved portion and two ends, the ends each have a threaded surface, the curved portion is located between the ends, at least a portion of the end has a trilobular shape, and the curved portion is shaped so that a distance between the ends is shorter than the length of the end.

Abstract: A screw fastener includes a head portion, a shaft portion extending from the head portion, and at least one locking serration. The shaft portion has a helical thread structure defining a thread part and a root part. The locking serration protrudes from the root part of the helical thread structure. The locking serration is configured and arranged to allow rotation of the shaft portion in a fastening direction and to restrict rotation of the shaft portion in a non-fastening direction upon engaging with a workpiece.

Abstract: The present invention relates to a stud including, a first end and a second end, a torque transferring structure located at the first end, a shaft provided with an axis and including a threaded surface that is provided with a locking thread located adjacent to a Vee shaped thread, the threaded surface is dimensioned to engage a plurality of threads on a nut body, wherein the plurality of threads on the nut body are provided with a diameter greater than an M12, and the locking thread on the shaft is provided with a root surface located between a first angled surface and a second angled surface, wherein the root surface is angled relative to the axis of the shaft.

Abstract: A threaded engagement element comprising a body having a longitudinal axis and a thread adapted to be received by a corresponding thread of a second element. The threads are characterized by a thread parameter. The body has first and second portions that each has a different value for the thread parameter. The body may have more than one thread count or more than one geometry. This configuration creates a threaded engagement element with self-locking threads, which prevents unintentional loosening.

Abstract: A thread-cutting screw (1) serves for being screwed into the bore-hole wall (1a) of a bore-hole (1b). It comprises a substantially cylindrical core (2) of metal which has a central longitudinal axis (4), a thread (5) forming one piece with the core (2), and at least one cutting element (6, 7), disposed within the thread (5), for cutting engagement with the bore-hole wall. The core (2) consists of a metal of a carbon content between 0 and 0.5 percent by weight. The at least one cutting element (6, 7) is fixedly connected with the core (2), constituting a welded structure of a metal with a carbon content greater than 0.8 percent by weight. Being safely connected to the core (2), the cutting elements (6, 7) offer efficient cutting operation, with any risk of brittle fracture of the screw (1) being precluded.

Abstract: The present invention relates to a stud including, a head having a torque transferring structure and an underside wherein the underside includes a plurality of protrusions; a shaft having a trilobular shape comprising a plurality of shaft elements having at least one solid shaft element and a plurality of outer surfaces, wherein the plurality of outer surfaces includes a threaded surface with a locking thread located adjacent to a Vee-shaped thread.

Abstract: A metal fastener for frangible material has a threaded shank, a head proximate one end of the shank and a tip at the opposite end. The fastener has a coarse pitch and relatively large ratio of major to minor diameters suited for securing the fastener into frangible material such as drywall or masonry.

Abstract: A male threaded fastener particularly suited for use in plastics has a high thread and a low thread. Depressions are provided in the pressure flank of the high thread. Dimensional relationships are defined for scaling the fastener to commonly accepted sizes.

Abstract: A male threaded fastening member is provided with depressions in at least one or several helix wraps of the thread adjacent the head, the depressions extending inwardly from an edge of the thread at least part way toward a shank of the male fastening member. In a fastening system including the male fastening member, a female member includes projections for engaging the depressions.

Abstract: A threaded fastener has a substantially single helical thread formed upon a shank portion thereof, and a plurality of substantially saw-blade type or serrated teeth are formed upon crest portions of leading ones of individual thread portions of the helical thread. The threads of the threaded screw fastener are also characterized by means of predetermined flank angles, and such flank angles, in conjunction with the saw-blade type or serrated teeth, permit the threaded screw fastener of the present invention to be utilized within any one of a multiplicity of substrates, such as, for example, wood, metal, thermoplastics, composite materials, concrete, hard aggregate, or the like.

Abstract: Screw provided with self-locking rolled thread, wherein, in a plurality of places along its extent, the thread is deformed in relation to the normal thread cross section in that the thread outside diameter is reduced by radial compression of limited thread portions, the area of the thread cross section being substantially identical to that of the undeformed thread. While maintaining the slant of the thread flanks, the thread cross section is symmetrically widened in the outer region and reduced in the adjoining inner region, the transition from the widened to the reduced thread cross section lying approximately in the centre of the respective thread flank, and the limited thread portion extends over two parts of a thread turn such that there result two symmetrically opposite thread portions each of approximately ? of the thread turn.

Abstract: A screw member having a loosening prevention function is provided to improve a fastening power and a relative strength in thread connection. With an arrangement to provide a first crest portion and a second crest portion at the opposite ends of a thread point, a first screw member generates a loosening prevention effect due to elastic deformation of the first crest portion and the second crest portion, with the entire thread flank from the base portion to the point brought into contact with a second screw member on the both surfaces of the thread flanks. With this arrangement, a strong fastening power can be obtained, and a clamping force applied to the thread is distributed over the thread, thereby enabling improvement in the relative strength in thread connection.

Abstract: A torque prevailing stud having a male component made of a shank with an outer wall that is threaded, a gripping component formed on the shank, and a wedge ramp rolled in a portion of the threaded outer wall. A female component having a body with a threaded bore that is used for engaging the male component. The threaded bore of the female component matingly engages a portion of the threaded outer wall and the wedge ramp when screwed thereon. The wedge ramp forces the threaded bore to conform to the shape of the wedge ramp thereby securing the male and female components together in a torque prevailing fit.

Abstract: A screw includes a rod-shaped portion, and a spiral-shaped thread winding around the rod-shaped portion. The rod-shaped portion has a straight portion, and a front end portion tapering towards a pointed front end. Several cutting trenches are formed on the rod-shaped portion for cutting bits off a workpiece with which when the screw is being screwed into the same. The tapering front end portion is provided with a notch, and cutting teeth are provided on that portion of the thread corresponding to the tapering front end portion. Cut-off bits of a workpiece can be received in the trenches as well as the cutting teeth so that the same can't have excessive resistance against the screw.

Abstract: The invention relates to a bolt for integrally fastening a first member and a second member, which are spaced away to each other, the bolt comprising a cylindrical-shaped collar bolt provided on a portion of an outer peripheral surface thereof with an external thread portion and on an inner peripheral surface thereof with an internal thread portion; and a bolt body having in an area of one end of a shank an external thread portion capable of threading into the internal thread portion of the collar bolt and a head on the other end thereof.

Abstract: A threaded fastener has a substantially single helical thread formed upon a shank portion thereof, and a plurality of substantially saw-blade type or serrated teeth are formed upon crest portions of leading ones of individual thread portions of the helical thread. The threads of the threaded screw fastener are also characterized by means of predetermined flank angles, and such flank angles, in conjunction with the saw-blade type or serrated teeth, permit the threaded screw fastener of the present invention to be utilized within any one of a multiplicity of substrates, such as, for example, wood, metal, thermoplastics, composite materials, concrete, hard aggregate, or the like.

Abstract: A screw includes a rod-shaped portion, and a spiral-shaped thread winding around the rod-shaped portion. The rod-shaped portion has a straight portion, and a front end portion tapering towards a pointed front end. Several cutting trenches are formed on the rod-shaped portion for cutting bits off a workpiece with which when the screw is being screwed into the same. The tapering front end portion is provided with a notch, and cutting teeth are provided on that portion of the thread corresponding to the tapering front end portion. Cut-off bits of a workpiece can be received in the trenches as well as the cutting teeth so that the same can't have excessive resistance against the screw.

Abstract: A corrosion-resisting, self-tapping screw (1), in particular a concrete screw, to be driven into a bore, which has a wall, comprises a substantially cylindrical core (2) of corrosion-resisting metal with a central longitudinal axis (8); a thread (5), which is integral with the core (2); and at least one cutting element (9), which has at least one cutting head (12) for cutting engagement with the wall of the bore; the at least one cutting element (9) being inserted in the core (2), tightly joined thereto and consisting of a hardened metal, and the at least one cutting head (12) being arranged in the thread (5).

Abstract: A gutter fastener (10) having a first shank portion (14) with a head (12a) integrally formed on one end and a second shank portion (16) integrally formed with the opposite end. The first shank portion has a length (L1) substantially equal to the water collecting opening in a gutter (20), while the second shank portion has a length (L2) substantially equal to one half the length of the first shank portion. The second shank portion includes screw-like threads (50) for engaging the facial panel (24) behind a gutter arid enabling a more secure connection between the two.