Abstract: A fitting to interconnect water pipes or to connect pipes with valves or mountings. The connector housing has an O-ring seat, constituting two walls of a groove for an O-ring. The fitting comprises a clamping sleeve, having a first end provided with a flange, which forms a third wall of the O-ring seat groove. The flange is retained against the coupling housing by a nut screwed by hand onto outer threads on the coupling housing. The clamping sleeve is adapted to be clamped against a pipe which is inserted into the clamping sleeve, and the O-ring seals against the outer surface of the pipe.

Abstract: In a silver-plated product wherein a surface layer of silver is formed on the surface of a base material or on the surface of an underlying layer formed on the base material, the surface layer of silver is formed by electroplating in a silver plating bath which contains 1 to 15 mg/L of selenium and wherein a mass ratio of silver to free cyanogen is in the range of from 0.9 to 1.8, and thereafter, an aging treatment is carried out to produce a silver-plated product wherein an area fraction in {200} orientation of the surface layer is 15% or more.

Abstract: A fitting assembly is provided with a first fitting component having a stepped wall surface; and a second fitting component radially spaced from the first fitting component when the fitting assembly is in a finger tight condition prior to pull-up. When the second fitting component is displaced into contact with the stepped wall surface during fitting pull-up, the stepped wall surface assists in separating the first fitting component from the second fitting component upon fitting disassembly.

Abstract: A tube connection structure includes a joint body and a coupling member. The coupling member has a fastening part threaded with the joint body and a tool-engaging part gripable with a fastening tool. The coupling member and the joint body are-configured such that the tool-engaging part is separated from the fastening part after the coupling member is mounted to the joint body. The joint body and the coupling member have a threading contact part. The components of the threaded contact part are in contact with each other so that the threading of the coupling member over the joint body is limited before the tool-engaging part is separated from the fastening part.

Abstract: The present invention provides a casing connection. The casing connection has a first sub with a first circular radius face and a second circular radius face. A second sub is provided having a third circular radius face and a threaded profile on at least a portion of an outside surface of the second sub. An adjusting collar is further provided having a fourth circular radius face and a threaded profile on at least a portion of an inner surface of the adjusting collar. Sealing surfaces are formed at connections between the first circular radius face and the fourth circular radius face, the second circular radius face and the third circular radius face and the second sub threaded portion and the adjusting collar threaded portion. Bendability and rotatability of the casing connection is adjustable by tightening or loosening said threaded connection between said second sub and said adjustable collar.

Abstract: A method and apparatus used for connecting adjoining conduit segments in oil and gas well operations is disclosed. The apparatus and method discloses use of a receptacle assembly attached to one conduit segment and stinger assembly attached to a second conduit segment. A rotatable wheeled hub threadably joins the stinger assembly to the receptacle assembly. The conduit connection ends of the stinger assembly and the receptacle assembly may be configured to accommodate a variety of common types of conduit connections such as Chiksan, hose, pipe, tubing, casing, flanges, hubs and other conduits for conveying media.

Abstract: An interchangeable fitting system generally involving a fitting, the fitting including a male connector and a female connector, the male and female connectors each having a forward portion and an aft portion, the male connector having a primary sealing structure and a secondary sealing structure, the female connector having a primary sealing structure and a secondary sealing structure, and the male primary sealing structure being interfaceable with the female primary sealing structure, and the male secondary sealing structure being interfaceable with the female secondary sealing structure.

Abstract: A lockwireless, anti-rotation fitting for attachment to connectors, including a sleeve, nut, spring, and retaining washer. The sleeve is slidably inserted within the nut and the spring is inserted on the sleeve, grips it, and locks the sleeve with the nut. The nut includes a plurality of serrations which engage a tab extending from the spring. The spring, which is semi-anchored to the nut, can only rotate inwardly or in the clockwise direction. The tab of the spring may only ratchet over the serrations when a predetermined counter-clockwise or loosening torque is applied to the nut. The serrations allow for rotation in the clockwise direction, while preventing counterclockwise rotation until a predetermined torque is reached.

Abstract: A pipe connecting device having a joint body including a fitting cylinder to which a flared synthetic resin-made tube is to be externally fitted, an external thread formed on a radially outward side of the fitting cylinder; and a union nut including an internal thread screwed with the external thread, and a tube pressing portion that presses a diameter changing portion formed between a flared portion in the tube, and a non-flared portion, in the direction of the axis. In a fastening completion state in which the tube pressing portion is caused to press the diameter changing portion by a screw advancement of the union nut, the screw advancement being produced by screwing the internal thread to the external thread, positions of a basal end of the external thread and a tip end of the union nut in the directions of axes coincident with each other.

Abstract: An oil pipe connection device has a base, an oil pipe, a pipe connector and a securing nut. The base has a connection hole and an abutting shoulder. The pipe connector is mounted in the connection hole and has a tapered head, an insertion segment, a pressing collar and an engaging recess. The tapered head abuts with the abutting shoulder. The insertion segment is inserted tightly into an end of the oil pipe. The pressing collar is around the insertion segment and has an inclined guiding surface. The engaging recess is formed between the pressing collar and the insertion segment and holds the end of the oil pipe inside. The securing nut is mounted around the oil pipe, is connected with the connection hole in a threaded manner and has an inclined guiding surface abutting with the inclined guiding surface on the pressing collar.

Abstract: A swivel joint includes a pipe part and a swivel nut. The pipe part has a first end and a second end and the swivel nut has a first end and a second end. The swivel nut is positioned on the pipe part such that the first end of the swivel nut forms a swivel connection with the first end of the pipe part. The swivel nut and the pipe part include shoulders against each other for preventing separation of the swivel nut from the pipe part. The swivel nut is made such that the swivel nut and the pipe part are connected together by pushing the first end of the swivel nut towards the first end of the pipe part whereby the swivel nut and the pipe part are connected by a snap joint.

Abstract: The present invention discloses a plunger adaptor/collet nut component that connects to the plunger of a down hole pump on the plunger adaptor end and a pull tube on the collet nut end. The pull tube extends through a top seal assembly and into a bushing/collet nut component located above the top seal assembly. In the preferred embodiment, the plunger adaptor/collet nut component is dimensioned such that a 1.125 inch diameter pull tube can connect to the collet nut while the plunger adaptor is dimensioned such that it can connect to the top of plungers for larger diameter pumps such as 1.75 inch and 2.0 inch down hole pumps. The bushing/collet nut component of the preferred embodiment is dimensioned such that the collet nut attaches to the top of the pull tube guide and permits a 1.125 inch diameter pull tube to pass through it while the bushing is dimensioned to accommodate the smaller 1.

Abstract: A fluidic connection system may comprise a port which includes a capillary tube receptacle with an end seal face and a threaded wall. The fluidic connection system may also comprise a capillary tube that includes a front end face for sealingly abutting against the end seal face of the port. On the capillary tube, a flange may be affixed at a distance from the front end face of the capillary tube. The fluidic connection system may further comprise a fitting nut that includes an axial hole to allow the capillary tube to pass therethrough and a matching threaded wall corresponding to the threaded wall of the port. The fitting nut may be slidably coupled with the capillary tube behind the flange. The distance at which the flange is affixed may be predetermined such that when the flange is pushed forward by the fitting nut, the front end face of the capillary tube abuts directly against the end seal face of the port.

Abstract: A screw connection device for connecting two pipes with flared ends, comprises a screw, a nut and a spacer. The nut has a front end aperture from which an accommodating space extends to a rear end aperture in a rear end wall. A surface of the nut in the accommodating space has a threaded section which extends toward the rear end wall which has a flange face in the accommodating space. In a pre-installed state, the spacer and a first pipe end with a first flare are accommodated in the nut, such that the spacer is held undetachable between the first flare and the internal thread. A second pipe end with a second flare can be held in the accommodating space by the screw, threaded into the nut such that the second flare is pressed against a sealing surface of the spacer and the spacer is pressed with a further sealing surface against the first flare.

Abstract: A fluid coupling assembly has a single fluid connection, including a plate and at least a pair of nipples extending away from the plate in a first direction, and at least a pair of connection pipes connected to each of the nipples extending from the plate in a second opposed direction. The nipples include a thread at an outer periphery, a ramped surface spaced in a direction beyond the thread and towards the plate, and a ditch beyond the ramped surface. A fluid coupling has a thread at an inner periphery received on the thread on the nipple, and the coupling has a plurality of circumferentially spaced fingers spaced by grooves, with the fingers being snapped into the ditch and is biased against the ramped surface. The plate, at least a pair of nipples and at least a pair of connection pipes are all formed of an integral piece of metal.

Abstract: A joint member that includes a cylindrical sleeve member having a first outer diameter portion having a first outer diameter and a second outer diameter portion having a second outer diameter smaller than the first outer diameter. The joint member further includes a cylindrical nut member having an inner peripheral surface on which a first thread is formed and a bottom in which an opening is formed. The joint member further includes a limit member fixed to an outer periphery portion of the second outer diameter portion inserted into the opening and in contact with an outer surface of the bottom of the cylindrical nut member.

Abstract: A connector unit for connection of a fluid line to the mattress of a waterbed which unit has a first connecting piece assigned to the waterbed mattress, a second connecting piece assigned to the fluid line and a connecting sleeve which while in mounted position encompasses the first connecting piece and the second connecting piece in part at least. At least one of the connecting pieces has a thread and is provided as a screw type socket. The connecting sleeve is provided with a thread for threaded engagement with the at least one screw type socket. Just one connecting piece is threaded. The, connecting piece without thread is of flange type and provided with a flange which protrudes radially outward. The connecting sleeve has an inwardly protruding annular web to engage behind the flange of the flange type socket which is of such shape that with the sleeve in mounted position it gets at least axially clamped against the threaded connecting piece.

Abstract: A multiple secured coupling device for oxygen lances 1 is achieved in that both the male connector 8 of the safety pipe 3, the connection part 18 of the lance holder 2 and also the cap nut 9 have an extending safety piece 10, 11. In this way, the male connector 8 can be inserted very far into the female part 19 or the connection part 18 and then located in position using the cap nut 9. A total of five sealing zones are created that in particular effectively prevent the escape of highly flammable gases, in particular oxygen.

Abstract: A glueless union suitable for joining piping and other plumbing components. Several components are used to create the union. The portion of each plumbing component that is to be joined is a circular, thick-walled section which is centered on a central axis. This portion has a mating face that is perpendicular to the central axis. The union includes an annular face seal which is compressed between the opposing mating faces of the plumbing components to be joined.

Abstract: A ferrule for use with a nut with an internal locking mechanism includes a first tubular portion with a first end and a first outer diameter for connecting to a first object; a second tubular portion with a second end and a second outer diameter for connecting to a second object; a transition portion connecting the first tubular portion and the second tubular portion; and a plurality of pockets spaced circumferentially around the second portion to engage the internal locking mechanism of the nut.

Abstract: A joint apparatus for prevention of explosion includes a bellows tube including an extension section integrally formed at one end of the bellows tube and an annular protrusion interposed between the extension section and the bellows tube; a coupling nut coupled with the bellows tube; and a connection member coupled with the bellows tube while being supported by the annular protrusion. A gap is formed between a the extension section and the connection member and gas discharged from the bellows tube flows along the outer surface of the extension section through the gap and is discharged to an outside through a rear section of the annular protrusion. Since a travelling path of the gas is lengthened, pressure and temperature of the gas are lowered, so that gas explosion is prevented.

Abstract: A coupling for joining fluid conduits includes a nut having a circumferential groove that extends at least partially along an interior surface of the nut. The nut further includes a tab opening extending through a surface of the nut for receiving the tab of a retaining clip. A cylindrical shaft extends from the nut. The retaining clip is disposed within the circumferential groove and includes a tab disposed within the tab opening of the nut. A first arc of the retaining clip extends from the tab in a first circumferential direction, and a second arc of the retaining clip extends from the tab in a second, opposing circumferential direction. The first arc includes a first knob and terminates in a second knob, and the second arc includes a third knob and terminates in a fourth knob. The second and fourth knobs are larger than the first and third knobs, respectively.

Abstract: A connector is used to connect pipes for conveying a fluid. A plastic male screw connector is manufactured through injection molding of a plastic material to replace a conventional screw connector made of a costly metallic material so that the manufacturing costs can be reduced. Since the screw connector is manufactured through injection molding, mass production of the screw connector becomes possible and the manufacturing costs can be significantly reduced. Also, the plastic material of the screw connector allows for the connector to handle high pressure, resist corrosion and reduce fluid friction.

Abstract: A drill pipe connector assembly capable of connecting drill pipe segments without rotation. The assembly includes the pin end of a first drill pipe stabbed within the connector end of a second drill pipe. A connector nut is threadedly connected or snap locked to the connector end of the second drill pipe. The connector nut includes a retaining shoulder cooperating with a beveled shoulder on the pin end of the first drill pipe to retain the first drill pipe. The assembly includes seals to provide pressure integrity and prevent leaking. Cooperating rotational torque transfer profiles in the first and second drill pipes enable operational rotation of the drill string.

Abstract: A fitting assembly is provided with a first fitting component having a stepped wall surface; and a second fitting component radially spaced from the first fitting component when the fitting assembly is in a finger tight condition prior to pull-up. When the second fitting component is displaced into contact with the stepped wall surface during fitting pull-up, the stepped wall surface assists in separating the first fitting component from the second fitting component upon fitting disassembly.

Abstract: A system for mounting an injector to an exhaust conduit in an exhaust treatment system includes a boss having an externally threaded surface. The boss is adapted to be fixed to the exhaust conduit. A retention member is adapted to be coupled to the injector housing to transfer an axial load to the housing. An internally threaded nut includes a flange engaging the retention member. The nut threadingly engages with the boss to clamp the housing of the injector to the boss as the nut is rotated.

Abstract: A threaded union includes a threaded union nut configured to couple abutting ends of a threaded nipple on a distal end of a first joint and a shouldered nipple on a distal end of a second joint and a lower wedge and an upper wedge positioned within an offset distance formed between a lower surface of the union nut and an upper surface of an enlarged section of the shouldered nipple.

Abstract: A coupler for use in sealing a joint between two pipes. The coupler is comprised primarily of two center sections and two end caps. The two center sections are engagable with one another and the two end caps are engagable with the center sections. Gasket rings create seals between the two center sections as well as between the two center sections and the cap rings. The center sections are dimensioned to create a volume of space within the coupler, thus permitting the coupler to accommodate offset joints. The gasket rings between the cap rings and the center sections can be longitudinally spaced apart, minimizing the angular deflection of the coupler with respect to the pipes when the pipe joint is offset. The center sections and end caps can be lockably engaged.

Abstract: An improved flared cone fitting of the type having a male portion and a female portion having a tube, an inverted conical annulus, a nut, and a joinder portion, may be disclosed. It is improved by the joinder portion including a back-side annular face, which may define a void. The joinder portion may also include an abutment intended to contact a shoulder of a fitting nut and properly direct forces exerted on the nut.

Abstract: A refrigerant connection structure for an air conditioner is disclosed. The refrigerant connection structure for the air conditioner includes a connection member connected with a heat exchanger, an external refrigerant pipe connected with the connection member, the external refrigerant pipe formed of a different material from a material used to form the connection member, and a coupling member which connects the connection member and the external refrigerant pipe with each other, wherein an contact area between the external refrigerant pipe and the coupling member is configured to prevent galvanic corrosion.

Abstract: A metal ring gasket provides a high-pressure temperature tolerant metal-to-metal seal between subcomponents of a threaded union. The metal ring gasket is received in an annular cavity formed between mating surfaces of the subcomponents of the threaded union. The metal ring gasket is capable of maintaining a fluid seal even at very high temperatures resulting from direct exposure to fire. At high fluid pressures the metal ring gasket is energized because hoop stress induced by the fluid pressure forces the metal ring gasket into tighter contact with the subcomponents of the threaded union.

Abstract: A thick-wall small-diameter high-pressure fuel injection pipe has a spherical seat surface, an annular flange, and a conical surface continued from the seat surface at a connecting end of the pipe. If the pipe is configured so that t (thickness)/D (outer diameter)<0.3, then an axial distance from the connecting head end to the back face of the annular flange is 0.38D to 0.6D, a spherical radius of the seat surface is 0.45D to 0.65D, the annular flange outer diameter is 1.2D to 1.4D, and an inner peripheral surface of the head has a substantially flat cylindrical surface or a conical surface. If the pipe is configured so that t (thickness)/D (outer diameter)?0.3, then the axial distance from the connecting head end to the back face of the annular flange is 0.38D to 0.7D.

Abstract: A torque limiting fluid connector system which can be hand screwed to a maximum tightening torque but can be hand loosened, including: an outer member having a front opening, a back opening, and a plurality of outwardly flexible portions separated by axially extending slots; an inner member having a front opening, a back opening, an interior threaded surface and a plurality of outwardly extending projections dimensioned to be received within the axially extending slots when the inner member is received within the outer member; a connector having one end received within the inner member and an opposite end extending out of the back end of the inner member; and a washer mounted onto the end of the connector that is received within the inner member.

Abstract: A fluid connector assembly comprising (a) a connector body having an inner concave seat having a portion defining a frustoconical surface; (b) an elongate tube having a flared end; and (c) a nut; wherein the connector body is adapted to receive the elongate tube and the nut to form a substantially rigid connection, and wherein the flared end of the tube and the frustoconical surface of the seat are engaged so as to form a fluid seal between the body and the tube; and wherein the flared end has a portion defining an abutment surface having a borderline region in abutment with the frustoconical surface of the inner seat of the body; and wherein the abutment surface of the flared end is a spherical surface.

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: An adapter integrates a tail piece and connection for coupling to plumbing fittings utilizing a union nut or flange and provides a press-fit connection to the tail piece for installation in the system. The method of manufacturing the adapter comprises the steps of forming a flange on a section of conduit; placing a threaded union nut or mounting flange over the flange fitting; roll-forming an internal, concave annular recess into the section of conduit extending from the nut and inserting an O-ring into the recess for completing the adapter. The adapter can then be sealably attached to a plumbing fitting, such as a valve or the like, utilizing a conventional flat gasket between the flange of the adapter and the plumbing fitting. The installation is completed by inserting a conduit into the adapter to clear the O-ring and crimping the bead formed by the recess to complete the sealed connection.

Abstract: A seal material and a washer are fitted on a piping main body of a first piping, a bead portion is inserted into a bead portion insertion hole and the seal material and the washer are inserted into a seal material insertion hole. In this state, a female screw is threaded onto a male screw until a piping side stopper and a nut side stopper are abutted, and the nut member is joined to a piping side tube portion. In a state where the piping side stopper and the nut side stopper are abutted, the seal material is compressed in an axial direction via the washer by the small diameter tube portion and the seal material pressure-contact surface. The seal material is elastically joined to an outer circumferential surface of the piping main body and an inner circumferential surface of the bead portion insertion hole in a radial direction.

Abstract: A conduit fitting of the type having first and second threaded fitting components and at least one conduit gripping device, further includes a stroke limiting member that allows the fitting to be pulled up by applying a predetermined torque. In one embodiment, the stroke limiting member may realized as an integral or integrated load bearing member that functions as a torque collar and deflects under load. The disclosure also presents a gauging structure and method for fittings that can be pulled up by turns, by torque or both.

Abstract: A threaded connection assembly comprises a nut, a multiplier connected to the nut via a first threaded interface having a first number of threads per inch and a well servicing pipe coupling connected to the multiplier via a second threaded interface having a second number of threads per inch. A method of forming a threaded connection for a well servicing application comprises forming a pipe coupling between two well servicing pipe sections and threading a connector to the pipe coupling to form a threaded connection without impact loading the connector. Another method for forming a threaded connection comprises disposing a first pipe section partially within a nut, threading a multiplier into the nut, threading the multiplier onto a second pipe section, and leveraging the multiplier against the nut, or vice versa.

Abstract: A female element (1) includes a hollow internal body (2) having an end (3) provided with fastening device (5) to one of the pipes to be joined, a hollow external body (7) coaxial with the internal body (2) and having an end (8) which axially protrudes with respect to another end (4) of the internal body (2) opposite to that provided with the fastening device (5), one rigid central stem (9) coaxially supported by the internal body (2) by a transversal perforated base (18) and having a widened end (10) near the protruding end (8) of the external body (7), an axially sliding sealing bush (12) coaxially arranged about the stem (9) and elastically stressed to be engaged with the widened end (10) of the stem (9) to prevent the passage of fluid within the female element (1), a cleaning bush (14) coaxially arranged about the sealing bush (12) and axially stressed in position so as to prevent the entrance of dirt about the sealing bush (12) and a lock sleeve (16) arranged about the protruding end (8) of the external b

Abstract: A metal ring gasket provides a high-pressure temperature tolerant metal-to-metal seal between subcomponents of a threaded union. The metal ring gasket is received in an annular cavity formed between mating surfaces of the subcomponents of the threaded union. The metal ring gasket is capable of maintaining a fluid seal even at very high temperatures resulting from direct exposure to fire. At high fluid pressures the metal ring gasket is energized because hoop stress induced by the fluid pressure forces the metal ring gasket into tighter contact with the subcomponents of the threaded union.

Abstract: A pressurized respiratory gas humidifier adapter with a pressure relief valve having an audible signal generating device incorporated into a low-flow respiratory gas supply system at a position in the system wherein the pressure relief valve and an audible signal generating device are protected from inadvertent damage during use of the humidification system, especially during connection of the adapter into the respiratory gas supply system and when the adapter is connected to a humidifier container prior to coupling into the gas supply system.

Abstract: A hose connector includes a cylindrical elongated member having a first and second end, a first and second inner sleeve rotatably mounted on the cylindrical member, and a first and second outer sleeve capable of connecting to the respective first and second inner sleeves.

Abstract: A locking device (1) is fixed to a nut (4) and includes a coupling unit (42) insertable into a hexagonal configuration (11) of a spigot end (2) at a reduced axial distance being coupled by mutually interpenetrable gears (49, 51) with a stop unit (38) which axially slides in a body (18) opposite to a compression spring (36). The gears (49, 51) are symmetric and are insertable into each other with a predetermined elastic resistance by the action of compression or loosing torque. The device is embodied in one piece which is mounted by assembling with the nut without affecting the spigot ends (2, 3).

Abstract: An electrical fitting in the form of a connector or coupler for connecting an electric metal tube to an electrical box or panel or to one another. The fitting includes a body having an inlet end portion, an outlet end portion and a bore extending therethrough. An unidirectional locking device is disposed in an outermost chamber and a sealing washer disposed in an intermediate chamber. A split ring having an angularly bent leading end is provided with a series of offset circumferentially spaced unidirectional gripping tangs. The locking device may also be provided with a series of tube support tangs at the trailing end. Also, the locking device includes a tang forming an electrical bonding or ground between tubes, locking device and connector body.

Abstract: A sprinkler apparatus including a manifold is used with a nipple and a union. The manifold includes a pipe section and at least one port. There is a fitting on the port. The nipple has a proximal and distal end. A fitting is located at the distal end of the nipple. One or more radially extending projections may be positioned around the circumference of the nipple. The fitting on the distal end of the nipple may form a water-tight seal with a fitting on a valve without tightening with a wrench by mating projections and indentations and applying a torque to the union. The union includes one or more indentations that may align with and mate with the projections to allow the union to slide over the nipple. The union has a fitting. The fitting on the union corresponds to and engages the fitting on the port.

Abstract: A tubular connection including a first joint having outer threads and an inner bore, and a second joint having outer threads and an inner bore. The tubular connection further includes an outer nut having inner threads that cooperate with the outer threads of the first joint and the second joint. The tubular connection further includes an inner sleeve positioned within the first inner bore and the second inner bore. In one embodiment, the first inner bore contains a first groove having a first seal disposed therein and the second inner bore contains a second groove having a second seal disposed therein, wherein the first and second seals prevents a pressure from exiting the first and second inner bore.

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: A connection head structure of a high pressure fuel injection tube is provided to avoid an interference between an annular flange and an opposing part by sufficiently maintaining an tube axial direction length of the connection head and to obtain a good sealability to prevent leaking during autofrettage processing with a high pressure of not less than 300 MPa. A connection head structure of a high pressure fuel injection tube includes, on a connection end portion of a thick walled fine steel tube, a spherical seat face, an annular flange, and a circular conic face that continuously extends from the seat face, wherein a washer and a fastening nut are assembled, characterized in that when a thick walled fine steel tube has t (wall thickness)/D (outer diameter)<0.3, an tube axial direction distance L1 from a connection head end to the back face of the annular flange is from 0.38 D to 0.7 D, a spherical body radius R of the seat face is from 0.45 D to 0.

Abstract: A drive nut (918) for a fitting includes an interior socket centered on a central axis and configured to receive at least a rearward portion of a conduit gripping member. The socket is defined by a radial drive surface (932) positioned to engage the conduit gripping member during pull-up, a first tapered longitudinal surface (940) radially outward of said drive surface and a second tapered longitudinal surface (934) between the drive surface and the first tapered longitudinal surface.