Abstract: A method for coating a screw element, in particular a screw element for connecting pipes, preferably motor vehicle pipes, wherein the screw element has at least one thread as well as at least one unthreaded contact surface. At least areas of the thread are provided with a first coating, and at least areas of the unthreaded contact surface are provided with a second coating. Both the first coating of the thread as well as the second coating of the unthreaded contact surface are applied to the thread or to the unthreaded contact surface via plasma coating.

Abstract: A method for treating a pipe, in particular a motor vehicle pipe, wherein a flare is generated at least at one pipe end of the pipe. At least areas of the flare are provided with at least one layer, which changes the friction properties of the coated surface of the flare. The flare is coated by means of plasma coating.

Abstract: The disclosure relates to a method for producing multi-walled tubes, in which a metal strip is rolled up to form the multi-walled tube. The metal strip has at least one steel layer, and at least one solder layer is applied to the steel layer. The solder layer consists at least in part of metal. According to the disclosure, the solder layer is applied to the steel layer by plasma coating.

Abstract: A screw element for connecting pipes, preferably automotive pipes, wherein the thread is provided with a first coating in at least one area, and wherein at least one thread-free contact surface is provided with a second coating in at least one area, characterized in that the first coating comprises at least 40 wt %, preferably at least 50 wt % and especially at least 60 wt % of at least one epoxy compound, in particular at least one phenol-based epoxy compound and at least one lubricant.

Abstract: The invention relates to a screw element for the connection of tubes, preferably motor vehicle lines. A threading and at least one contact surface without threading are provided on the screw element. The screw element has an outer coating and an inner coating. The outer coating comprises a first polymer and nanoparticles of a first solid material. The inner coating may also comprise nonoparticles or a polymer.

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 screw connection device for fluid lines having a coupling nut with an interior space and having an internal threading running over the circumference of the interior space, as well as having a connecting element with an external threading. A line end of a fluid line is accommodated in the coupling nut, wherein the line end exhibits an end shape. When the internal threading of the coupling nut is screwed to the external threading of the connecting element, a locating surface disposed in the interior space of the coupling nut is moved toward the back end of the end shape, or vice versa, respectively. A spring element is disposed between the locating surface and the back end of the end shape, running over the circumference of the fluid line.

Abstract: A screw connection device for connecting two pipes, comprising two pipes with flanged pipe ends, a screw, a nut, and a spacer, wherein the nut includes a receiving space, wherein the spacer is securely received in the receiving space. The spacer retains the first pipe securely in the nut, wherein the second pipe is retained in the screw and can be fastened in the nut by means of the screw. An exterior surface of the spacer has at least one cylindrical section, wherein the spacer has a first end surface and a second end surface. A first projection is provided on the spacer, which engages with the nut in the region of the receiving space such that it is securely accommodated therein. The nut includes an exterior surface with flat sub-surfaces. At least one flat sub-surface includes an indentation to form a detent in the retaining space to secure the spacer in the nut. In one form the exterior of the nut has six flat sub-surfaces and every other flat sub-surface has a detent.

Abstract: The invention relates to a screw element for the connection of tubes, preferably motor vehicle lines. A threading and at least one contact surface without threading are provided on the screw element. The screw element has an outer coating and an inner coating. The outer coating comprises a first polymer and nanoparticles of a first solid material. The inner coating may also comprise nonoparticles or a polymer.

Abstract: A screw connection device for connecting two pipes, comprising two pipes with flanged pipe ends, a screw, a nut, and a spacer, wherein the nut includes a receiving space, wherein the spacer is securely received in the receiving space. The spacer retains the first pipe securely in the nut, wherein the second pipe is retained in the screw and can be fastened in the nut by means of the screw. An exterior surface of the spacer has at least one cylindrical section, wherein the spacer has a first end surface and a second end surface. A first projection is provided on the spacer, which engages with the nut in the region of the receiving space such that it is securely accommodated therein. The nut includes an exterior surface with flat sub-surfaces. At least one flat sub-surface includes an indentation to form a detent in the retaining space to secure the spacer in the nut. In one form the exterior of the nut has six flat sub-surfaces and every other flat sub-surface has a detent.

Abstract: A multiple walled tube is rolled from a metal strip for transporting fluids, specifically in automobile engineering, where the metal strip consists of stainless steel. A method for manufacturing such a tube, where the stainless steel strip is brazed in an H2 atmosphere after rolling, specifically by the addition of a brazing solder.