Abstract: A fastener including a body having a predetermined axial length, wherein the body includes a screw head at one axial end of the body, a threaded portion at an opposite axial end of the body and an unthreaded shank portion extending between the screw head and the threaded portion, and wherein the shank portion has an axial length in excess of at least one-third of the axial length of the fastener body.

Abstract: An electrically-insulative threaded connection includes a pin member having a pin thread and a box member having a box thread. An insulating composite layer is disposed between the pin thread and the box thread. The insulating composite layer includes an insulating fiber and insulating resin. The pin thread and the box thread are wedge threads. A method of making an electrically-insulative threaded connection includes forming a pin wedge thread on a pin member and winding a filament over the pin wedge thread. The filament is wetted with a resin, thereby forming a composite layer. The composite layer is cured and machined to mate with a box wedge thread.

Abstract: This invention relates generally to a flexible fastener for coupling members. In a preferred embodiment, the flexible fastener may be used to couple members that are non-parallel, non-aligned, or in specific instances when selective compliance in a member is desired. The present invention is directed generally to a fastener that comprises a spiral set of teeth. The spiral set of teeth are configured to allow a nut to travel along at least a portion of the spiral set of teeth. A selectively compliant core material runs completely internally to the spiral set of teeth, so that the fastener is laterally flexible along a length of the fastener. The selectively compliant core material is connected to the spiral set of teeth.

Abstract: A deck screw is intended for use with composite lumber, although it can be used with other wood products, such as pressure treated lumber. The deck screw has a head and a shaft that has two regions of different diameter. The upper region has threads that exceed the number of threads of the lower shaft, on a unit length basis. The threads of the upper shaft may be configured in an inverted buttress design. The lower region of the shaft terminates at a tapered distal end having a pointed tip that leads the screw through the wood material. Threads are provided on the lower region of the shaft. A crown extends around the perimeter of the head.

Abstract: A fixation screw, graft ligament anchor assembly, and method for fastening a graft ligament in a bone tunnel. The screw comprises an elongated shank having a distal end and a proximal end, and a central axis extending from the distal end to the proximal end. Screw threads are disposed on the shank and extend from the distal end to the proximal end. The proximal end defines an end plane disposed transversely to the axis and at an angle thereto other than a normal angle.

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: This invention is directed towards a paint spray gun having a gun body with a male thread and having an air nozzle ring with a female thread which can be screwed onto the male thread of the gun body. The diameter of the thread is between about 30 and about 40 mm. The thread of the invention is a trapezoid thread with a flank angle in the range of about +/?20% of 30°. The thread has a thread height within the range of about +/?20% of 1.1 mm, a root to crest clearance within the range of about +/?20% of 0.1 mm and a flank clearance within the range of about +/?20% of 0.15 mm. The effect of these modifications to a standard trapezoid thread with a flank angle of about 30° is that the thread is optimally adjusted to serve as a thread connecting the body of a paint spray gun and a nozzle ring.

Abstract: A plastic push-in or drive fastener having a enlarged head and a shank is disclosed. The fastener is configured to allow the shank to be pushed through a complementary shaped aperture or opening in an article using a relatively low insertion force. A helical screw or rib formation on the fastener shank provides a retention force opposing the fastener from being axially withdrawn from the article while readily permitting withdrawal of the fastener from the article in response to rotation of the fastener about its axis. Moreover, the fastener shank is configured to prevent inadvertent separation of the fastener from the article through which it passes.

Abstract: This invention relates generally to a flexible fastener for coupling members. In a preferred embodiment, the flexible fastener may be used to couple members that are non-parallel, non-aligned, or in specific instances when selective compliance in a member is desired. The present invention is directed generally to a fastener that is laterally flexible along its length, comprising a shank covered with a spiral set of teeth and a flexible core material running internally to the shank and along the length of the shank, wherein the shank and the flexible core material are coupled at both distal ends of the fastener. In a preferred embodiment, a means for imparting rotational movement to the fastener is attached at a distal end. The preferred means are a bolt head and a screw head.

Abstract: A thread-forming screw includes a head and a shank, the shank having a thread and a thread-forming zone at the end opposite to the head, the thread-forming zone also having a thread portion. The shank at the end opposite to the head has a spherical portion with a maximum diameter in a plane perpendicular to the axis of the shank which corresponds approximately to the mean diameter of the thread of the shank.

Abstract: A fastener, such as a nail, screw, etc., which possesses supplemental support and/or retention capability is provided. The fastener includes an elongated auxiliary member secured interiorly to, exteriorly to, or along the shaft of the fastener. The auxiliary member is secured to the shaft at two or more portions of the shaft. The auxiliary member provides the shaft with additional support strength and/or enables fastened materials to be retained upon breakage or shearing of the shaft as a result of, for example, heavy tensile or shearing loads. To facilitate breakage or shearing of the shaft, the shaft may be provided with a deformation, such as a notch or reduced circumference, at one or more desired locations such that the shaft breaks or shears at the deformation(s), thereby allowing the auxiliary member to function as the sole member which retains the fastened materials.

Abstract: A screw with protruding sheets on a head portion comprises a thread portion; a screw tail at one end of the thread portion, a slot formed on the screw tail; a plurality of screwing sheets formed at another end of the thread portion; a plurality of recesses formed between the plurality of screwing sheets for removing undesired pieces; a drilling head being formed at front ends of the screwing sheets; the drilling head formed with a plurality of protruding sheets made of soft metal. By screwing the screw by rotating from the slot, the screw will rotate so as to drill a hole and enter into a wood plate. Then the protruding sheets enlarge the hole. The undesired wood pieces are removed from the recesses. When the screw further drills into a metal plate, the protruding sheet will be worn out because the protruding sheet is made of soft metal.

Abstract: A self-tapping screw (1) consists of two interconnected sections (7 and 8) of stainless material. The first section (7) comprising the tool access (4) and the thread (6) consists of stainless, austenitic steel and the second section (8) configured as a boring part (5) consists of martensitic steel.

Abstract: Screw made of plastic for screwing into a material of low strength, e.g. rigid foam plastic, having a deep thread compared with the screw shank, the screw shank running out conically into a screw point. The screw has the following features: 1. the depth of thread H and the minor diameter Dk of the thread form a quotient Q1=H/Dk in the order of magnitude of 1 to 3.5, preferably 2; 2. the minor diameter Dk and the thread pitch P form a quotient Q2=Dk/P in the order of magnitude of 0.3 to 0.6, preferably 0.5; 3. the thread is designed as a V-thread having a vertex angle of the thread teeth of less than 30°.

Abstract: A fastener has a shaft, a head at a first end of the shaft, and a point at the other end of the shaft. A first portion of the shaft adjacent the point is threaded. The first portion typically extends about one-half the total length of the shaft. A second portion of the shaft (adjacent the head) is not threaded, but has a plurality of spaced rings. A knurled portion can be provided between the first and second portions, if desired. Conventional symmetrical or asymmetrical thread can be used in the threaded portion, or a three lobe thread can be used.

Abstract: A fluid-tight, adjustable and self-locking threaded connection assembly comprising a nut and a bolt. The nut which is adapted to be fixed to a first structural member has a bore comprising a threaded portion and a smooth cylindrical portion. The bolt which is adapted to be removably connected to a second structural member has an intermediate portion provided with a plurality of circumferential sealing lips. The sealing lips are dimensioned with respect to said smooth cylindrical portion of the nut bore such that it is slidingly urged against said smooth portion of the nut bore when the bolt is adjusted relative to the nut. As a result thereof the threaded connection assembly is fluid-tight and self-locking while being adjustable.

Abstract: The invention relates to a bone screw, particularly for use with external splints in fracture stabilization, comprising an elongate cylindrical body (2) of predetermined length and diameter tapering into a threaded end portion (5) which terminates with a tip (6), and an opposite screw-handling end (3). The screw-handling end (3) has substantially the same diameter as that of the elongate cylindrical body (2) and comprises a flat (7) extending parallel to the axis of the cylindrical body over the main part of the cylinder body portion unoccupied by the thread. In a further embodiment, the screw-handling end (3) is formed with a plurality of flats (8) extending parallel to the axis of the cylinder body (2) at predetermined spacings. These flats extend over the main part of the cylindrical body portion unoccupied by the threadway and alternate with lands (9).

Abstract: A screw with a thin head comprising a screw head (2) and a shank (4), and with its top (5) forming a circular arc of a large radius has an unthreaded part (20) tapered down between the bearing surface (6) and the thread (3) and has a radius (21) connected to the thread portion (3), and therefore it will be readily produced to be used for compact products and correspond with thin products. And the radius (21) is connected to the unthreaded part (20) of the shank on one hand and to the screw ridge (3) on the other, preventing stress concentration at this part from occurring at time of fastening and a long time after the fastening of the screw, so ensuring a fastening strength, without causing a fatigue fracture. And further, when heating and plating treatments have been given to the screw, as the top of the screw head is not flat, there is no possibility of the heads of the screws being stacked to each other in the course of mass production, ensuring stable heat and plating treatments.

Abstract: An irrigation valve comprises a valve housing made from a valve body joined to a valve bonnet by a plurality of attachment screws. The valve body and valve bonnet have an alignment rib received in an alignment notch when the body and bonnet are joined together such that the holes that receive the attachment screws are automatically aligned with one another. The attachment screws have a smooth portion adjacent a threaded portion such that the smooth portion when visible signals to the user that the attachment screws are clear of the valve body but are still captured in the valve bonnet. The valve includes a solenoid that may be remotely actuated to open the valve. An L-shaped actuator arm is also operatively connected to the solenoid for manually opening the valve with the upper portion of the actuator arm being closer to the user than in previous valves and thus easier to grip and turn.

Abstract: A natural resin is dissolved in liquid oils and fats while a phosphate-based extreme pressure additive is evenly mixed in to prepare a paint composition. After the paint composition is applied to a high-strength hexagon head bolt (2) and a hexagon nut (3), centrifugal separation is performed for removal of excess paint composition and drying of the composition. Coating films can easily and quickly be formed. The high-strength hexagon head bolt (2) and the hexagon nut (3) thus provided with a coating film are fastened to each other by screwing. The heat and pressure generated during the fastening process cause the phosphate-based extreme pressure additive to react with the metal on the surface of the high-strength hexagon head bolt (2) and the hexagon nut (3) so that the phosphate-based extreme pressure additive in the film bonds to the metal. The coefficient of friction is reduced regardless of the smoothness of the surface of the high-strength hexagon head bolt (2) or the hexagon nut (3).

Abstract: A specially designed bolt fastens together two parts of an engine and in particular can fasten together two components of a rocker arm assembly. The bolt is in a bore passing through the two components. The bolt has a full-diameter pilot that closely fits with the bore at a location where the components mate, and thereby locates the components relative to each other. On opposing axial sides of the pilot are reduced-diameter shank portions of the bolt, which form cylindrical gaps with the bore. The pilot has groove communicating the cylindrical gaps, whereby the gaps and grooves form an oil flow path along the bolt. A duct in each component communicates with a respective one of the cylindrical gaps, so that oil flows through one component, along the bolt and then into the other component.

Abstract: The present invention relates to a novel screw for use with dry wall and for hanging articles therefrom. This invention provides a screw with a head adapted for engagement with a driving tool, a shank whose diameter decreases from the head to a distal end, and a helical thread with a pitch diameter of at least about twice the largest minimum diameter of the shank. The thread including a geometry of an auger.

Abstract: A connection bolt (1) for repeated tightening beyond yield point which bolt (1) comprises a head (2) and a shank which shank is provided with a thread, whereby said head (2) of said connection bolt (1) is provided with at least one indication mark (9) at a fixed defined mutual angle position to at least one indication sign (10), which sign (10) is provided on the free shank (5) end relative to the axis (q—q) of the bolt (1) rotation. This system of marking allows to determine the damage of said bolt (1) exactly and to decide about further ability of said bolt (1) to be used next time without any risk of destruction or decrease in quality of a joint.

Abstract: An object is to provide a high strength screw in which a high strength steel material not used in the prior art is employed as the tapping screw or gib-head screw or bolt or the like, and moreover, which, by the administering of a carburization hardening process on the surface thereof, has high tensile stress and shear stress, and has high surface hardness, and which has, particularly in tapping screws, good male thread formability with respect to the foundation hole of the opposing member, and very good tightening and joining properties and durability. Another object of the present invention is to provide compatibility with a machine screw in such a way that, once the tapping screw has been removed from the opposing member, a machine screw can be screwed into the male thread formed by the tapping screw.

Abstract: The invention provides a self-screwthread-forming screw comprising an artificially ageable light metal alloy as the screw material, whose shank is provided with a screwthread having screwthread flanks, and which is distinguished in that in at least one region of the screw by virtue of a differing heat treatment the material has a different structure from in the rest of the screw. The invention also provides a process for the production of a screw having the following process steps: forming the screw by rolling or cutting production of the screwthread geometry, solution heat treatment of the screw, quenching of the screw in water, and artificial ageing of the screw, in which the screw if subjected to differing heat treatment in various portions thereof.

Abstract: The invention comprises a self-screwthread-forming screw of corrosion-resistant steel, which screw is partially precipitation-hardened. The invention also concerns a process for producing such a screw in which the screw is firstly shaped by pressing and rolling or by screwthread rolling or cutting or in other known fashion characterized in that the screw is then partially precipitation-hardened.

Abstract: The steel setting device is a pair of temporary bolts, wherein each bolt having an enlarged flat head portion, a cylindrical body portion with a slot extending through the body portion proximate the head, and a tapered portion. The device includes a flat wedge element having an isosceles trapezoidal shape. The bolts are inserted through aligned apertures in the steel plates of girders to be joined to a column, the plates being placed to abut the column, the head portion of the bolt being on one side of the plate and the slot being on the other side of the column. The wedge elements are inserted through the slots to temporarily secure the two steel plates together. Permanent bolts and nuts may then be installed through other pairs of aligned apertures in the plates. Once the permanent bolts are installed, the wedges may be tapped out of the slots and the cylindrical bolt elements of the steel setting device may be removed.

Abstract: A stud comprises a head and a stem with a threaded end length and a length having an axial knurling proximate to the head and adapted to be driven with radial interference into an axial bore of a radial flange portion fast for rotation with the hub of a motor vehicle wheel. The stud comprises at least one knurled surface having an area other than zero in a projection on a plane perpendicular to the longitudinal axis of the stud. The knurled surface is adapted to co-operate with the radial flange portion for preventing rotation of the stud.

Abstract: A threaded fastener having a threaded shaft with a head disposed on a portion thereof and a deflectable flange protruding outwardly from the shaft at or near the head. The deflectable flange has a generally concave surface facing toward a leading end of the fastener shaft. A protuberance is disposed on the shaft and spaced apart axially from the generally concave surface of the deflectable flange to limit compression of a fixture clamped between the fastener head and a work surface.

Abstract: An article of manufacture in the form of a screw retaining mechanism for assembling a pair of objects. The mechanism comprises a tubular wall of given thickness defining a plastic boss on one object; a screw having a threaded shank secured in the boss by grooves complementary to the screw threads, the screw having a head clamping the other object to the first object; and a heat shrunk sheath residing on the screw threads and shank to act as a threaded interference fit film between the screw threads and the boss grooves, the sheath having metal wires weavingly embedded into the sheath to extend at least generally parallel to the axis of the tubular wall.

Abstract: The present invention is to a lightweight threaded bolt type fastener having a shank with a large diameter portion and small diameter portion connected by a transition portion; a thread is roll formed on the small diameter portion and terminates in a run-out section where the thread gradually decreases in root depth and width and with the run-out section being of minimal axial length and being located closely adjacent the transition portion to produce a run-out zone of minimal axial length. A rolling die for forming the thread with minimal thread run-out having ridge segments with tapered end surfaces for providing the run-out thread with an end wall parallel to the transition portion and a method of making the bolt type fastener.

Abstract: A method and apparatus for applying a coating composition to a surface on at least one panel member using a fastener having the composition on its exterior. The fastener, which has a greater coefficient of thermal expansion, is fitted within the panel member, and during thermally-induced expansion, acts to facilitate diffusion of the composition into the panel surface. The coating composition is applied to the fastener via conventional methods to the fastener, and is engineered to react with the material of the panel member to form, via a diffusion process, an intermediate coating in the region of the panel member and coating materials.

Abstract: An insulated wall includes first and second spaced apart layers of concrete having a layer of insulating material sandwiched therebetween. Extending through the insulative layer are a plurality of spike connectors having their opposite ends protruding into the two concrete layers and having their central portions extending through the insulating material. On of the opposite ends of the spike connectors is pointed so as to permit it to be punched through the insulative layer. The opposite ends of the spikes each include a holding surface facing at least partially toward the central insulative layer and holding the concrete layers against movement away from the insulative layer. C-shaped connectors may also be used in a similar fashion with hook ends hooked over elongated cables extending within the two concrete layers so as to tie them together.

Abstract: A carbon steel screw has one or more portions which have been selectively hardened by selective heat treatment and quenching. In one embodiment, an upper portion of the screw head is selectively hardened to prevent or reduce damage when torque is applied using a driving tool. In another embodiment, the screw tip is selectively hardened for more effective penetration into a substrate. Preferably, the selectively heated portions are selectively quenched to reduce or avoid distortion.

Abstract: A self-tapping screw, in particular a concrete screw, comprises a cylindrical core with a central longitudinal axis and a thread designed in a single piece with the core and provided, in the area of its periphery, with cutting notches formed by triangles open towards the periphery of the thread. The flanks of the thread extend substantially in parallel to each other radially to the central longitudinal axis.

Abstract: A mounting bolt 30 has a disclike flange portion 30b formed on an end of a tightening portion 30a. A switch bracket 28 is fixed to a screw hole 12 by tightening the bolt 30 with the bolt 30 inserted into a mounting hole 29 formed so as to have the same diameter as the screw hole 12. A rubber cover 21 covers the switch bracket 28, and has an annular seal portion 21a formed thereon. The seal portion 21a is larger in diameter than the mounting hole 29 and smaller in diameter than the flange portion 30b. A stepped portion 30c is formed on the bolt 30 in such a manner that a surface of contact thereof with the bracket 28 extends in parallel to the bracket 28, that the diameter thereof is larger than the mounting hole 29 and smaller than the seal portion 21a, and that the length thereof in an axial direction is such that the flange portion 30b biases the seal portion 21a at the time of tightening the bolt 30.

Abstract: A screw, particularly a wood screw present a combination of a threaded cylindric stem (10) merging, over an inversely frustoconical part (16) with an enlarged diameter cylindric portion (20) which is integral with an underside of a large diameter washer section (23) which, in turn is integral with a shallowly convex head portion (25). The invention is intended for wood screws usually in the range of about 6 mm and provides a reduced chance of injury by providing a smooth merging with the flat surface on which the screw head is located. Also, the screw has an improved torque characteristics making it suitable for use with power screw driving tools.

Abstract: A rotor lid assembly for a rotor body comprises a lid portion having a centrally depending shank. A bore formed through the shank receives a tie-down stem having a diameter smaller than the bore. A piston-like portion disposed along the stem contacts a periphery of the bore. A venting channel is formed along the shank to allow fluidic flow to and from the bore. The piston portion occludes such flow when the stem is in a first position and permits fluid flow when the stem is in a second position. In one embodiment the lid assembly comprises a lid member and a safety knob, each having a central neck portion and a bore formed therethrough with the neck portion of the knob received in the bore of the lid. A venting channel is formed through both neck portions. A tie-down stem is received in the bore of the knob.

Abstract: The bucket elevator construction bolt comprises a flat head and a threaded shaft, the bolt further incorporating a collar adjacent the head, the collar including a plurality of elongate, radially arrayed spline teeth which engage within the material of the elevator belt, maintaining the bolt position against radial torque or vibratory forces applied thereto.

Abstract: A biangular countersink in a skin panel to be joined to an underlying support member includes a frustoconical base portion defining a large included angle and an extremely shallow outer portion cut at a very small acute included angle. Fasteners usable with the countersink have heads with frustoconical undersides matching the deeper base portion of the countersink and rounded heads sized to fit within the shallow, acutely angled outer portion of the countersink. The combination of fastener and biangular countersink reduces annular grooves or "halos" which typically are formed around conventional flush head fasteners.

Abstract: The present invention provides an improved, lightweight, compact threaded fastener that has a relatively shortened transition thread rollout zone between the grip of the fastener and the threaded shank of the fastener. This transition zone is shortened due to the fact that the runout (or inner end) of the rolled thread on the fastener extends no more than one-third the circumference of the rolled thread at its pitch diameter. The short runout of the rolled thread does not compromise the strength of the fastener, because the runout does not have a relatively abrupt transition. Instead, the depth of the runout of the rolled thread of the fastener gradually decreases along its length from a depth equal to the uniform depth of the rolled thread throughout the length of the threaded shaft of the fastener to no depth at the very end of the runout. The invention further provides a pair of thread rolling dies for producing such an improved, lightweight, compact threaded fastener.

Abstract: A fastener comprising a shaft having a preselected length for use in fastening at least two materials together. A head extends radially around the shaft at one end. The shaft is provided with an enlarged shaft portion located in proximity to the head. The enlarged shaft portion has a pair of opposite ends, a cylindrical center portion and a pair of frusto-conical tapered portions. Each of the frusto-conical tapered portions extends from the center portion to one of the ends. The enlarged shaft portion has a length less than the length of the shaft.

Abstract: The bolt or stud shaft and nut combination includes an undercut of the first thread of the shaft adjacent the load face of the nut, the undercut having a compound fillet with the smaller radius lying between the larger radius and the first thread of the shaft. The shaft threads are buried two threads deep into the nut so that the first two teeth of the nut do not contact the threads of the shaft and overlie the undercut. The nut threads have a taper opening the pitch diameter in a direction towards the loaded face. The combination affords resistance to high-cycle fatigue of rotating structures joined together by the bolt or stud shaft and nut combination.

Abstract: The invention contemplates a compression wire for fixated retention of a fractured small bone fragment in an osteosynthesis procedure. The wire comprises a smooth-walled shank portion and an adjoining threaded portion, of lesser diameter than the diameter of the shank portion, there being a step-down shoulder between the shank portion and the threaded portion. The shank portion is adapted for chucked engagement to a portable rotary drill, and the distal end of the threaded portion is configured for self-tapping entry into and threaded implantation in bone. The implantation is complete when the shoulder engages cortex tissue of the fragment, holding the same in compression against remainder structure of the fractured bone. Once implanted, the shank may be nipped by a cutter tool at relatively close offset from the shoulder.

Abstract: A screw-threaded connection incorporates multiple synchronized threads, that is, one connection element has a set of external threads that mates with a corresponding set of internal threads on the mating connection element, in customary fashion. The first connection element additionally includes a second set of internal threads synchronized with the first set such that the leads of both sets of threads are the same. This second set of internal threads mates with a corresponding set of external threads on the mating connection element. Of course, the two sets of threads on the mating connection element are synchronized such that their leads are the same, and, of course, the same as first sets of mating multiple synchronized threads. This multiple synchronized thread connection has application to any fluid connector and particularly to fluid connectors in wide-variant temperature deviation, high-pressure, and/or mechanical vibration environments.

Abstract: A connection for components in a medical implant assembly utilizes a tapered mating surface on each component with cylindrical splines and flutes formed on each mating surface such that the surfaces are complementary to the extent that the splines of one surface are received in the flutes of the adjacent surface. Each surface is continuous with no discontinuity which would act as a stress raiser or enhance concentration of stress in one locale. The complementary surfaces are urged into registry by a screw connection coaxially through the surfaces.

Abstract: A hybrid panel fastener for use in conjunction with a nut and cage assembly for fastening and unfastening a composite access panel that is galvanically compatible with the composite access panel, suitable for low observability applications, and high cycle usage includes a composite shank member and a metallic sleeve member integrated in combination. The composite shank member includes an interface segment having a peripheral engagement surface, a body segment contiguous with the interface segment, and a head having a torque-input surface contiguous with the body segment. The metallic sleeve member has an externally threaded surface and an integration bore that is complementary to the peripheral engagement surface of the interface segment.

Abstract: A fastening or connecting device for fiber-reinforced ceramics to be used in high temperature ranges is in the form of a screw that is manufactured of a ceramic material in the shape of a plate having fiber layers with fibers oriented parallel to the surface of the plate. The plate thickness is less than 90% of the core diameter of the thread so that upon cutting a thread a discontinuous thread results. The bore of a complementary nut is provided with a continuous inner thread that cuts through the fiber layers at a right angle.

Abstract: A composite lead screw for use in a linear drive assembly is provided. The lead screw comprises a generally cylindrical carrier means. The carrier means has disposed therein at least one helical seating groove. This helical seating groove has a lead substantially equivalent to the lead of the lead screw. The lead screw also comprises at least one helical guide means having a lead substantially equivalent to the lead of the lead screw. The helical guide means is seated in the helical seating groove. A follower nut for use in a linear drive assembly in conjunction with the lead screw is also provided.

Abstract: A screw-threaded connection incorporates multiple synchronized threads, that is, one connection element has one or more sets of male threads that mates with one or more corresponding sets of female threads on the mating connection element, in customary fashion. Of course, the multiple sets of threads on the mating connection element are synchronized such that their leads are the same, and, of course, the same as the sets of mating multiple synchronized threads. This multiple synchronized thread connection has application to any fluid connector and particularly to fluid connectors in wide-variant temperature deviation, high-pressure, and/or mechanical vibration environments.