Abstract: A duct coupling system has a first duct with and end having a threads thereon, a second duct having an end with threads thereon, and a coupler having a first end threadedly engaged with the threads of the first duct and a second end threadedly engaged with the threads of the second duct. The ducts and the coupler are each integrally formed of a polymeric material. A plurality of tendons extend through the interior passageways of the ducts of the coupler.

Abstract: A threaded adaptor has a first end and an opposite second end of a generally hollow cylinder. At least one end has threading for connection to a hose or fitting and the ends form the male half of the connection. Centered upon the adaptor, a collar provides at least two faces for gripping of the adaptor by a tool. Within the adaptor, the two ends open into a smooth chamber that allows for uninterrupted fluid flow. To further seal the adaptor, at least one O-ring and at least one gasket are provided as alternate embodiments. In another alternate embodiment, the adaptor has one threaded end, an opposite barbed end with a clamp, and a collar with six faces. These two ends open into a chamber with a stepped diameter. The adaptor provides for flow of fluid with little turbulence.

Abstract: A fluid coupling 10 includes a first coupling member 11 and a second coupling member 12. The coupling members 11 and 12 are longitudinally movable relative to one another between first through fifth configurations illustrated in FIGS. 1-5 during a connection and disconnection sequence. The coupling 10 uses a locking sleeve 68 and locking balls 67 to facilitate connection and disconnection without tools. The coupling member 11 includes O-ring seals 26 and 27 carried on a sealing portion 24, and the locking balls 67 are radially spaced from the seals 26 and 27 during the connection and disconnection sequence to eliminate seal damage during the sequence. The first coupling member 11 includes a valve mechanism 41, 42, 43 and a fluid filter 46, and the valve mechanism is retained in place by the fluid filter 46. Cooperating valve mechanism 41, 42, 43, 63, 64, 65 includes a self-aligning valve poppet 64.

Abstract: The invention relates to a connection between two pipe parts. One of the pipe parts (1, 2) comprises a male end (3) and the other pipe part (1, 2) comprises a female end (4). The two pipe parts (1, 2) can be connected together by positioning the male end (3) to the female end (4) such that the pipe parts (1, 2) are rotated with respect to each other when they are connected. At least one end (3, 4) of one pipe part (1, 2) is provided with at least one protrusion (11) and at least one end (3, 4) of the other pipe part (1, 2) is provided with a corresponding recess such that the protrusion (11) and the recess together lock the pipe part (1, 2) to a correct positioned with respect to each other. The protrusion (11) is positioned on the outer circumference of the pipe part (1, 2), whereby the protrusion (11) is manipulatable outside of the pipe part (1, 2).

Abstract: Coating systems which provide corrosion resistance and, optionally, lubrication, for threaded connections are disclosed. The compositions comprise a first coating composition comprising polymer matrices of polyimides or epoxies which are modified with small amounts of a fluorine containing polymer. Also present in the coating compositions are corrosion inhibiting agents and inorganic particles having a mean diameter of between approximately 10 nm and 10 ?m. Solid lubricants, which may include at least one of PTFE, HDPE, Graphite, and MoS2, are optionally added to provide the first coating with a low coefficient of friction. The coating systems may further comprise a second coating composition, comprising a solid lubricant dispersed within an epoxy resin and a solvent. The first and second coating compositions are deposited on at least a portion of at least one of the pin and box members of the threaded connections.

Abstract: Provided is plumbing adaptor including a bore piece adapted to be inserted into a cock fitting, the bore piece including an extension movable in association with the bore piece to extend toward the inside of the cock fitting as required, a horizontal piece extending from the bore piece, and a connector adapted to be connected with a tap by extending from the horizontal piece.

Abstract: A threaded connection used in exploration and operation of hydrocarbon wells includes first and second tubular components, including respective male and female ends and threaded zones. The threaded zones include respective male and female threads, the threads including a root, a crest, a stabbing flank, and a load flank. A groove is provided in the load flank of the threaded zone of the female end and/or the male end respectively, adjacent to the root, and a boss projects axially from the load flank of the threaded zone of the male end and/or respectively from the female end adjacent to the crest, the boss including a convex and concave surfaces. The boss is housed in the groove with, in a connected state, a radial clearance between the concave surface and the groove and an axial clearance between the end of the boss and the bottom of the groove.

Abstract: A drill wrench for driving drill steels, drill bits, and bolts during drilling and bolting operations is disclosed. The drill wrench may include an internal driver for driving a drill steel. The internal driver may be inserted in an internal-drive recess defined within an end of the drill steel. When the drill wrench is rotated, the internal driver may drive the drill steel by engaging at least one surface within the end of the drill steel. The drill wrench may also include an external support member that supports the drill steel during drilling. The external support member may also drive the drill steel by engaging an outer peripheral portion of the drill steel when the drill wrench is rotated.

Abstract: Implementations of the present invention include drill string components having a thread extending around a body. The leading end of the thread can have a configuration that resists jamming and cross-threading. In particular, the leading end of the thread can include a planar surface normal to the body. The leading end of the thread can provide an abrupt transition to full thread depth that helps reduce or eliminate cross-threading. The leading end of the thread can be oriented at an angle relative to the axis of the drill string component. When mating male and female threads are similarly structured, the mating threads slide together along an interface at the thread start face and are drawn into a fully thread-coupled condition. The thread starts may have full circumference mating with no jamming positions.

Abstract: A lightweight and durable drill pipe string capable of short radius drilling formed using a composite pipe segment formed to include tapered wall thickness ends that are each defined by opposed frustoconical surfaces conformed for self-aligning receipt and intimate bonding contact within an annular space between corresponding surfaces of a coaxially nested set of metal end pieces and a set of nonconductive sleeves. The distal peripheries of the nested end pieces and sleeves are then welded to each other and the sandwiched and bonded portions are radially pinned. The composite segment may include imbedded conductive leads and the axial end portions of the end pieces are shaped to form a threaded joint with the next pipe assembly that includes contact rings in the opposed surfaces of the pipe joint for contact together.

Abstract: An irrigation pipe connector has a core that is adapted to connect to an irrigation element and a wing that is attachable to a wall of a pipe. The wing is provided with resiliency to allow the connector to deform in response to changing fluid pressures in the pipe. In addition, the wing may be provided with a thin segment in order to reduce potential damage during welding of the wing to the wall of the pipe.

Abstract: A minimum diameter full-strength pipe connection of low cost is disclosed for all services.

Abstract: An assembly for producing a threaded connection, including first and second tubular components with an axis of revolution, each including at one end a male threaded zone produced on the external circumferential surface, the ends each finishing in a terminal surface forming a direct drive dog clutch device to fix the first and second tubular components in rotation, and including a third tubular component which also has an axis of revolution and includes at each end on its internal circumferential surface two female threaded zones, one of the two male threaded zones being capable of cooperating with one of the two female threaded zones while the other male threaded zone can co-operate with the other female threaded zone. The male end of the first tubular component and the corresponding female end of the third tubular component include a mechanism for free rotation.

Abstract: The galling resistance of a threaded joint for steel pipes which satisfies the standards for an API round threaded joint and which has a pin with triangular male threads and a box with triangular female threads which threadingly engage with the male threads and an unthreaded sleeve positioned at the end of the box is improved. The unthreaded sleeve is shortened or removed so that the length of the unthreaded sleeve in the axial direction of the box becomes at most ½ (including 0) of the value specified by the above standards. The shape of the box specified by the above standards may be modified by providing a swoosh portion at the end of the box and/or by making the bevel angle at the end of the female threads ±15 degrees of the flank angle of the female threads.

Abstract: A threaded joint interconnects male and female parts of rock-drilling equipment, the female parts including an internal trapezoidal thread in the form of a helix thread ridge, which is delimited by a top and two flanks, a groove, having a bottom, running between two tops, and which thread ridge extends a plurality of turns between a front end and a rear end, the thread top touching an imaginary cylinder or cone that is concentric with a center axis of the female part. The bottom of the thread groove has a concave and partially circular cross-section shape along at least a part of the extension of the groove, and transforms into flanks via concave radius transitions, the radii of which decrease in the direction from the front end of the thread toward the rear one, at the same time as the radius of the groove bottom increases in the same direction.

Abstract: A hybrid port comprising a bore having a diameter, a first tapered surface having a cone angle ? in the range of approximately 37° to approximately 45°, a second tapered surface having a cone angle ? of approximately 12°, the first tapered surface disposed immediately proximate to the bore, and a threaded inner surface disposed axially between the first tapered surface and the second tapered surface.

Abstract: A female part intended for top hammer-drilling equipment includes a thread in the form of a ridge in a wall. The ridge is delimited by a crest and two flanks between which a likewise helical groove having a bottom runs. An end the of the groove is defined by a borderline, which separates the groove bottom from a part surface formed in the inside of the wall, the width of which part surface successively decreases in the peripheral direction, and which has a rotationally symmetrical shape essentially similar to the rotationally symmetrical basic shape of the thread.

Abstract: A threaded element of a component includes at least first and second threading portions each including threads each including a stabbing flank and a loading flank. The stabbing flanks and loading flanks of the threads of the first threading portion and the threads of the second threading portion are inclined in an opposed manner with respect to the radial direction.

Abstract: A galling-resistant threaded tubular component for drilling or operating hydrocarbon wells includes at one of its ends a threaded zone produced on its external or internal peripheral surface depending on whether the threaded end is male or female in type, with at least one portion of the threaded zone being coated with a dry film with a crystalline structure with a high specific surface area principally constituted by one or more mineral salts which are not reactive towards metals, and a process for coating such a component using a dry mineral film with a crystalline structure having a high specific surface area principally constituted by one or more mineral salts which are not reactive towards metals.

Abstract: A coupling arrangement has a coupling body and a helically shaped undulated metal pipe which has an end face extending along a screw thread of its undulation. A metal holding ring is mounted on the connecting part resting against the latter, where the outer diameter of the holding ring corresponds approximately to the outer diameter of the pipe, where the end face of the holding ring facing the pipe extends along a screw thread corresponding to the screw thread of the pipe, and where the holding ring is connected in the mounted position, fixedly to the connecting part by resting fixedly and tightly against the end face of the pipe.

Abstract: The pipe fitting comprises a plastic body (2) and a reinforcement ring (3) around the outside of the plastic body (2). The reinforcement ring (3) holds the body expansion under control. The reinforcement ring (3) is positioned at the distance (d) from the front end of the pipe fitting (1).

Abstract: A thin and highly transparent coating having excellent air tightness, adhesion to a substrate, lubricating properties, galling resistance, and corrosion resistance is formed on the surface of a metal substrate and particularly on the surface of a threaded joint which is used for connection of oil country tubular goods. A photocurable composition comprising (A) a photocurable (meth)acrylate resin, (B) a (meth)acrylate monomer selected from a monofunctional (meth)acrylate monomer and a difunctional (meth)acrylate monomer, (C) a trifunctional or higher multifunctional (meth)acrylate monomer, (D) a photopolymerization initiator, (E) a benzotriazole anticorrosive agent, (F) an anticorrosive pigment selected from a phosphate anticorrosive pigment and calcium ion-exchanged silica, and (G) a phosphate ester is used to form a photocured coating.

Abstract: A set for manufacturing a threaded connection, including first and second tubular components with an axis of revolution, one of their ends including a threaded zone formed on the external or internal peripheral surface of the component depending on whether the threaded end is of male or female type, the ends finishing in a terminal surface.

Abstract: An embodiment of the present invention relates to a connector used to connect pipes for conveying a fluid, and more particularly, to a plastic female screw connector which is manufactured through injection molding to replace a conventional screw connector made of a costly metallic material with an injecting-molded plastic screw connector so that the manufacturing costs can be reduced. According to the plastic female screw connector manufactured through injection molding according to the embodiment of the present invention provides advantages in that, since a screw connector for connecting pipes is manufactured through injection molding of a plastic material, mass production of the screw connector becomes possible and the manufacturing costs can be significantly reduced. Also, because the screw connector is made of the plastic material, excellent pressure resistance with respect to a high pressure, corrosion resistance with respect to a fluid used, and friction resistance can be accomplished.

Abstract: An oil pan nut configured to be secured to an oil pan includes a hub having an upper surface configured to support a mating surface of the oil pan, and a column integrally connected to the hub. A passage is formed through the hub and the column. The column is configured to be crimped over the upper surface of the hub in order to compressively sandwich at least a portion of the mating surface of the oil pan between the crimped column and the upper surface of the hub.

Abstract: A pipe connection is provided for connecting pipes of a motor vehicle, particularly exhaust pipes for an exhaust system or intake pipes for the intake tract of a combustion engine, with two pipes to be connected to each other. It is provided that at least one of the pipes has a thread which can be brought into engagement with a mating thread of a connecting element of the pipe connection to be connected to the other pipe. An exhaust system is provided for a motor vehicle and an air intake system is provided for a motor vehicle and a motor vehicle.

Abstract: A set for producing a threaded connection and a threaded connection. The set includes first and a second tubular components with an axis of revolution, one of their ends including a threaded zone formed on the external or internal peripheral surface of the component depending on whether the threaded end is of male or female type, the ends finishing in a terminal surface orientated radially with respect to the axis of revolution of the tubular components. The threaded zones include threads including, viewed in longitudinal section passing through the axis of revolution of the tubular components, a thread crest, a thread root, a load flank, and a stabbing flank, the width of the thread crests of each tubular component reducing in the direction of the terminal surface of the tubular component under consideration, while the width of the thread roots increases. The lead of the male stabbing flanks and/or load flanks is different from the lead of the female stabbing flanks and/or load flanks.

Abstract: A threaded joint comprises a coupling, a first pin, and a second pin, wherein the thread of the first pin has a pitch different from the pitch of the thread of the second pin. The extremities of the pins have slanted contact surfaces of complementary shape that make mutual contact after make-up of the joint. The slanted common plane of contact of both pins has an angle to the plane perpendicular to the longitudinal axis of the joint which is greater than 0°. In an alternative embodiment the contact surfaces of the pins are split into two staggered planes and comprise a seal in-between.

Abstract: Embodiments of the present disclosure provide systems and methods for assembly of tubular joints which overcome the drawbacks and limitations of conventional joints. In certain embodiments, the tubular joints may comprise threaded joints used in oil exploration. Joints may be assembled using a combination of a) position control, b) specific production tolerances for thread parameters, and c) coatings applied on threaded areas of the joint. In further embodiments, the tubular joints may have no torque shoulder and/or metal to metal seals. In additional embodiments, the joints may be further assembled and disassembled several times without application of dope or grease and exhibit enhanced sealability. Beneficially, embodiments of the present disclosure may provide high tolerance, precisely assembled joints that provide improved performance (e.g.

Abstract: A threaded connector including female thread and male thread. The female thread is symmetrically disposed on both ends of a coupling. The male thread is disposed at an end of a pipe. The female thread includes buttress thread. A torque shoulder is disposed in front of the buttress thread. The female thread is connected to the torque shoulder via a tool withdrawal groove. A protruding threaded segment is disposed on any one of a fourth to seventh tooth of the female thread to prevent high pressure gas from leaking.

Abstract: A member of a joint for a thin-walled drill tube presents a central axis and comprises a thread for forming a screw joint. The thread presents a thread bottom, a thread top, a pressure flank and a clearance flank. The pressure flank presents a portion having a negative angle less than 7.5°, but at least 0°, relative to a direction perpendicular to the central axis.

Abstract: A connection arrangement for connecting two especially cylindrical oil-containing components contains two receiving rings, each having a hollow connecting piece attached radially to the outside of the receiving ring with a passageway that ends at the inside of the receiving ring. The outer end section of the passageway contains a thread, wherein the pitch of the threads of the two connecting pieces is different. The two connecting pieces are connected by a hollow screw having two threaded sections. The thread of one threaded section corresponds to the thread of one connecting piece, and the thread of the other threaded section corresponds to the thread of the other connecting piece. The receiving rings are connected to the components such that a fluid connection is provided between the inner chambers of the two components through the two connecting pieces.

Abstract: A riser connector uses a box and upset pin connector threadform design having S-shaped load flanks that provide a variable load angles depending on the radial position along the engaged teeth. This design promotes a load path that changes with position along the axial length of the engaged thread, as well as increasing or decreasing external loads on the connector. The connector also varies radial distention of the pin from the box in a manner that is different from one thread to the next. The threadform uses a combination of thread cuts that vary in shape, pitch, and/or thread cone angle to provide load and stab flanks, as well as a load path, that vary from one axial end of the engaged thread to the other.

Abstract: A threaded casing connection for use in drilling-with-casing operations includes an integral, sacrificial wear sleeve on the downhole end of the coupling which has additional wear protection on portions of its outer wall and leading face.

Abstract: A threaded joint for steel pipes comprises a pin having male threads and a box having female threads which engage with the male threads. An incomplete thread is formed at the start of the male threads and the incomplete thread has a portion in which the angle ? formed between its crest face and its flank on the side facing a complete thread is an obtuse angle and in which the thread height h from the base of the flank is at least 0.2 mm.

Abstract: A telescopic pipe structure for a marine light includes a telescopic pipe and a positioning device. The telescopic pipe includes a second pipe and a fixed pipe. The positioning device is used to control the telescopic pipe in a fixed status or in an adjustable status. The positioning device includes a rotatable lid, a resilient sleeve, and a metallic ring. When the rotatable lid is turned clockwise or counterclockwise, the metallic ring will be pushed by the top of the fixed tube or returned to its original position by the resilient sleeve for controlling the engagement or disengagement of an contracted opening of the resilient sleeve and the second pipe so as to change the telescopic pipe in a fixed status or in an adjustable status.

Abstract: Pilot light gas line connector assemblies and methods for cleaning a pilot light orifice are disclosed herein. An exemplary connector assembly for coupling to a pilot light gas line and cleaning a pilot orifice has a first fitting end, a second fitting end, and a passageway therebetween. The first fitting end is adapted to receive a first end of the pilot light gas line and the second fitting end is adapted to receive a valve capable of directing forced air from a forced air source into the second fitting end. Methods of cleaning a pilot orifice of a pilot light system include removing the pilot light gas line from a gas port and coupling the pilot light gas line to a pilot light gas line connector assembly. Then forced air is directed into the connector assembly and through pilot light gas line thereby cleaning the pilot orifice.

Abstract: An aspect of the invention, is directed to a luer fitting. The luer fitting may include a male luer, a luer collar disposed about the male luer, and a fulcrum disposed at a base portion of a receptacle between the male luer and the luer collar. Another aspect of the invention, is directed to a breakage resistant fitting. The breakage resistant fitting may include a male portion having a central fluid passage, a supplemental securement portion generally concentric with the male portion, and an annular receptacle between the male portion and the supplemental securement portion. The annular receptacle may include a base region having a mating clearance interspace sized substantially greater than a mating female fitting in a radial direction, or an axial direction, or a combination thereof.

Abstract: In a pipe joint where two pipe sections (14, 16) have threadably engaged end portions (17, 18), joint ends (32, 34) are substantially sealed to each other by a sealing surface (40, 50) on one pipe section that substantially abuts a sealing surface (42, 52) on the other pipe section. In one joint, a ring-shaped cutout (121, FIG. 7) is formed in a first pipe section and a ring-shaped spacer (120) is located in the cutout. The spacer is chosen from several that have slightly different lengths so the spacer end contacts the corresponding sealing surface (130). In a pipe string used to carry corrosive fluid, the inner surface (44) of adjacent pipe sections is covered with a corrosion resistant coating (70, 72). Where the sealing surface is connected to a rounded corner (82, 84), the coating extends to and along the sealing surfaces (40, 42). Where there are sharp corners (80) at the intersection of the inside surface (40) with the sealing surface (40B, 42B), the coating does not extend along the sealing surfaces.

Abstract: The invention concerns a medical tubing assembly (100) comprising: finned medical tubing (10) formed from an elongate tubular member (20) disposed with one or more longitudinal fins (21, 21?, 21?), a collar (200), slidably mountable on the finned tubing (10), equipped with a locking means and optionally one or more suture eyelets (250, 250?), said locking means configured to 10 provide a locking force against one or more of the longitudinal fins (21, 21?, 21?). The invention allows securing of a medical tubing in situ that prevents slippage or damage to the tubing wall.

Abstract: A threaded joint for steel pipes comprises a pin (1) and a box (2). The pin has male thread (11), a sealing surface (13), and a shoulder surface (14) located on the end face of the pin. Correspondingly, the box has female thread (21), a sealing surface (23), and a shoulder surface (24) which can mate or contact with the corresponding portions of the pin. The shoulder surface (14) of the pin (1) is provided at an end face of the pin. The sealing surface (13) of the pin (1) is located on a pipe end side near the male thread (11). A a nose portion (15) is provided on the pin (1) between the sealing surface (13) and the shoulder surface (14), the nose portion (15) being not in contact with a corresponding portion of the box (2).

Abstract: A method and a draining adapter are provided for draining fluids, especially lubricant oils, from an engine or machine like a combustion engine and especially from a boat drive or another engine which is not accessible from underneath in order to open an outlet and let the fluid flow out.

Abstract: A pipe fitting facilitates joining of a high-density polyethylene (HDPE) pipe to a polyvinyl chloride (PVC) pipe. The fitting has a HDPE body. A ring-shaped PVC insert is positioned within an inner surface of the body at one opening of the body. An inner surface of the PVC insert is threaded so that a PVC pipe that has a threaded outer surface can be screwed into the PVC insert. A compression ring is installed over the outer surface of a portion of the body that surrounds the PVC insert. Prior to installation, the inner diameter of the compression ring is smaller than the outer diameter of the portion of the body that surrounds the PVC insert. For this reason, when the compression ring is installed, the compression ring compresses the portion of the body that surrounds the PVC insert, holding the PVC insert within the body.

Abstract: Use of thread forms with non-metallic threads is disclosed. These threads show differences between isotropic metals and an isotropic tubular composite.

Abstract: A showerhead or other water-dispensing assembly (100) is joined to a supply pipe (105) by a nut (110) and a collar (135). The supply pipe terminates in male threads (130). The nut includes a distal splined projecting section (120). The dispensing assembly includes a port (145) having a splined section (155), and an inner wall (160). The collar is slid onto the pipe, the nut is screwed onto the pipe, and the showerhead is held in its desired orientation while being urged toward the nut. As the distal splined projecting section enters the inner wall, the two splined sections engaged, preventing rotation of the showerhead on the pipe. The collar is then screwed onto the showerhead until it rests against the outer shoulder of the nut, thereby completing the non-rotatable installation.

Abstract: A method of forming a fastener that includes an axial centerline, a seating surface angled with respect to the axial centerline at an angle ? and adapted to contact an angled seat of a bore, the smallest diameter of the seating surface being designated a seating diameter, and a threaded connecting portion for engaging a threaded portion of a bore, the threaded connecting portion including a point designated a proximal contact point, the distance from the seating diameter to the proximal contact point in the direction of the axial centerline being the clamped length of the fastener, the method including steps of determining a value for at least a first one of angle ?, seating diameter D and clamped length L, solving the equation ?=arctan(D/(2L)) to calculate at least a second one of angle ?, seating diameter D and clamped length L, and forming a fastener based on the determined and calculated values. Also a fastener and fastener system based on the method.

Abstract: A threaded joint for steel pipes for use in an oil well which has enhanced galling resistance and which is protected from rusting comprises a pin and a box each having a contact surface including a threaded portion and an unthreaded metal contact portion. The contact surface of at least one of the pin and the box has a lower layer of a viscous liquid or semisolid lubricating coating comprising at least wax and a fatty acid alkaline earth metal salt and not containing a harmful heavy metal such as lead and an upper layer of a dry solid coating formed from an aqueous resin coating composition, an organic solvent type coating composition, or an ultraviolet curing coating composition.

Abstract: A male element for a sealed threaded tubular connection. Before tapered reduction swaging of an end region of a tube and machining in the region of a tapered male threading and a male lip to obtain a male tubular element for makeup into a female tubular element to form a sealed threaded tubular connection after diametrical expansion, the tube is shaped over a portion of its length to produce a cylindrical internal surface that connects via a chamfer to the cylindrical internal surface of the lip obtained subsequently by machining, the radius of the first surface being greater than the radius of the second surface.

Abstract: A threaded joint for a steel pipe comprises a pin and a box with a contact surface having a threaded part and a unthreaded metal contact part, wherein a solid lubricating film containing one or more kinds of lubricating powders selected from graphite, mica, calcium carbonate and kaolin, a copper powder, and a binder is formed on at least one contact surface of the pin and the box. An object of the present invention is to provide a threaded joint for a steel pipe which allows for repeated fastening and loosening of a threaded joint without adversely influencing on a human body and environment, and is excellent in galling resistance, rust preventing property and gas tightness.

Abstract: A wedge-threaded tubular connection includes a pin member and a box member, wherein each of the pin and box members include an engaged thread area, and a clearance gap volume formed between corresponding roots and crests of the pin and box members and arranged along an axial length of the engaged thread area according to a distribution profile. The clearance gap volume distribution profile is configured having a greater clearance gap volume proximate a central portion of the engaged thread area and progressively less clearance gap volume towards each of the distal ends of the engaged thread area.