Hollow cylindrical molded part having a thread

Abstract

The invention relates to a molded part (1) comprising a hollow cylindrical main body (2) having a mounting portion (MA), a fastening portion (BA) that adjoins the mounting portion in the axial direction (X-X), and at least one internal thread and / or external thread (10); wherein portions each with a different function are arranged successively in an inner channel (3) of the main body (2) for accommodating a plug part (4); and wherein the main body (2) is manufactured by injection molding a fiber-containing (F) plasticized thermoplastic polymer mass (M). In order to guarantee that the part has a high level of strength for withstanding stress while remaining technologically simple to produce, and without requiring inserts to be incorporated into in the main body (2) for this purpose, the invention proposes that the thermoplastic polymer of the fiber-containing (F) mass (M) is one which, in the unplasticized state, has a stress at break, measured according to ISO 527-2:2012, of ≥260 MPa.

Description

[0001] P45601PC01 / VIII / mß Voss Automotive GmbH, Leiersmühle 2-6, D-51688 Wipperfürth “Hollow Cylindrical Molded Part with Thread” The present invention relates to a hollow cylindrical molded part with an annular cross-section, such as a screw, a nut, a socket, a pipe plug, a pipe connector, or the like, wherein the molded part has a hollow cylindrical base body with a mounting section and with a fastening section axially adjacent thereto, wherein sections with different functions are arranged axially in an inner channel of the base body, in particular for the sealing reception of a plug part, and wherein the base body has at least one internal thread and / or one external thread and is manufactured by injection molding a plasticized thermoplastic polymer containing fibers. In particular, if the base body has an external thread in its fastening section,The molded part, in the transition from this fastening section to the axially adjoining assembly section, which typically has a larger diameter than the fastening section and is usually designed as a flange-like polygon, can have a threadless area with a comparatively thin wall thickness, also known as a relief groove or thread relief groove, in which a seal is often arranged when a connection is made, with the relief groove acting as a sealing groove or sealing channel. It is well known that, especially in push-fit systems for compressed air applications, union nuts made of brass are commonly used. P45601PC01 / VIII / mß However, polymeric or hybrid molded parts of the type mentioned above, manufactured particularly by injection molding, are also known from the prior art, which – primarily for reasons of cost savings – take into account the desire toReplacing brass with plastic. The relief groove or thread relief groove has often proven problematic in practice when using plastic for the base body. This is due, on the one hand, to the totality of stress concentrations on the outside of a hollow cylindrical component of the type mentioned above, which can reach their maximum in this area, especially when tightening a component designed as a cap screw. Stress concentrations are particularly noticeable at changes in diameter, circumferential edges, or radii – both on the outside and on the inner contour of the hollow cylindrical component. Another reason why the relief groove often presents a problem area is as follows. Connector components in modern plug-in systems with a hollow cylindrical component of the type mentioned above are also often made of plastic and have increasing diameters in the opposite direction of insertion. The reason for these increasing diameters is...that bending or alternating loads acting on the connector are particularly prevalent in a section of the connector located in the upper area, i.e., in the area of ​​the assembly section of the hollow cylindrical component, or protruding from it. Here, the connector has little or no support. Since the diameter of the inner bore cannot be reduced, the outer diameter of the connector must be increased to ensure sufficient strength. This, in turn, means that the inner diameter of the hollow cylindrical component of the aforementioned type, especially a union nut, must also be larger in this area. If this occurs in the area of ​​the thread relief, the wall thickness in the thread relief can become so thin that it cannot withstand the required tightening or loosening torques.so that tearing may occur in the area of ​​the thread relief. Molded parts of the type mentioned above are known, for example, from WO 2022 / 136406 A1, WO 2013 / 092234 A1, and WO 2009 / 124994 A1. Similar molded parts are also described in WO 2013 / 124994 A1 and DE 102010010651 A1, the latter being distinguished by the fact that the base body of the molded part, on the one hand, and any thread locking devices and / or circumferential seals, on the other, are manufactured from different polymeric materials in a multi-component injection molding process. Injection molding is a known discontinuous primary forming process, used especially for plastics. Injection molding allows,To produce industrially usable molded parts in large quantities and with high precision. For this purpose, the respective material or molding compound is plasticized in the injection unit of an injection molding machine and injected into an injection mold. Modern injection molding machines operate with a screw that plasticizes the molding compound – introduced, for example, as plastic pellets – conveys it, and finally injects it into the mold. The polymer mass solidifies in the cavity of the mold, after which the molded part can be demolded. While volume shrinkage that occurs during solidification can generally be compensated for – but only up to a certain point – by applying a holding pressure before demolding. Thermoplastics, thermosets, and elastomers can be processed by injection molding. It is also known to incorporate fillers, especially fibers, into the injection molding of thermoplastics.to use masses containing fillers, which – compared to a molded part without fillers – allows for the production of higher-strength molded parts. P45601PC01 / VIII / mß According to a method known from WO 2009 / 124994 A1 for producing a molded part of the type mentioned above, it is provided that the injection into the cavity takes place through at least two injection ports such that the fibers align themselves predominantly in the main stress directions of axial tension and torsion of the molded part. The injection takes place in the axial direction, with the mass flowing in a ring-shaped pattern around an inner core of the tool and flowing together between the injection ports. Weld lines are formed at these points, which generally have lower strengths than the rest of the molded part. A stress-adapted structure of the known molded part consists in the fact that, on the one hand, a proportion of fibers,which are oriented perpendicular to a longitudinal axis of the molded part in the circumferential direction of the annular cross-section, and on the other hand, the proportion of fibers oriented in the axial direction of the molded part is also less than 50 percent. While the method can surprisingly compensate for a negative weld line effect, at least partially, it is disadvantageous that, when hot runner nozzles are used with a known multiple gate as described in the document, a reliable and uniform cavity filling cannot always be guaranteed without additional process stabilizing measures. It has been shown that in industrial applications, with screw components of the type mentioned above, the significance of the torsional stress on the molded part often recedes after assembly compared to the significance of the axial tensile stress.However, the maximum torque that can be absorbed without breakage when screwing the molded part in or out plays a particularly significant role. In any case, a multiaxial stress state develops – especially during the assembly of a molded part of the type mentioned above – primarily in the area of ​​the aforementioned undercut. This results, in particular, in the requirement for high tensile strength, as well as increased shear strength and increased holding pressure effectiveness during manufacturing, as specified in P45601PC01 / VIII / mß. Holding pressure effectiveness refers specifically to the fact that the applied holding pressure ensures a homogeneous filling of the cavity, free of voids and – if weld lines are present – ​​with high weld line strength.The methods known from WO 2009 / 124994 A1 and the other aforementioned publications for manufacturing molded parts of the type mentioned above as injection-molded plastic parts offer advantageous technical solutions in the aforementioned aspects and have generally proven successful in practice. However, it has been shown that the various registered designs – with the exception of those according to WO 2022 / 136406 A1 – have not always been able to withstand the very high stress profiles that frequently occur in practice, particularly during assembly and disassembly, with sufficient durability. Many different reasons can contribute to the partial premature failure of the known molded parts, especially those designed as union nuts, such as dimensional problems like out-of-roundness, binding of the threads in the fastening section, shearing of the threads, or even breakage of a preferably dense,especially flange-like, multi-sided components forming the assembly section during tightening or loosening. A complete geometric redesign of a connection, especially a plug connection, with a molded part of the type mentioned above could potentially solve all these problems, but would then lead to entirely different dimensions. However, these types of connections are widespread, with threaded holes in the inner channel, or even the connection bores, often having specific dimensions, sometimes even being standardized. It is also not easily possible, for example, to reduce the inner diameter of plug parts to increase their wall thickness (P45601PC01 / VIII / mß), because this would not result in the desired or required flow characteristics. For example, this could adversely affect the response times of compressed air brakes. According to WO 2022 / 136406 A1, the task is to provide a screw-type component,which avoids the disadvantages known from the prior art – e.g., those from WO 2009 / 124994 A1 – and in particular features a high applicable torque and low manufacturing tolerance. The document describes a screw component with an annular cross-section, in particular a hollow screw or a nut, comprising a hollow cylindrical base body injection-molded at least partially from a fiber-containing plasticized polymeric mass, wherein the base body has at least one internal thread and / or one external thread and an internal channel for arranging and / or passing a piping system element in an insertion direction.wherein the inner channel has at least one sealing section for arranging a circumferential seal for sealing between the inner channel and the piping system element and / or at least one support section for supporting and / or guiding the piping system element and / or at least one retaining section for directly or indirectly locking the piping system element, wherein a preferably metallic insert sleeve is arranged coaxially to the inner channel in the base body, which is at least partially overmolded by the polymeric mass, such that the insert sleeve is at least partially surrounded by the polymeric mass in a radial direction towards the inner channel and radially repelling it from the inner channel. Preferably, the polymeric mass is a thermoset, wherein the polymeric mass is an epoxy resin (EP), an unsaturated polyester resin (UP), a vinyl ester resin (VE), a phenol-formaldehyde resin (PF), a diallyl phthalate resin (DAP), a methacrylate resin (MMA), a polyurethane (PUR), an amino resin,Contains a melamine resin (MF / MP) or a urea resin (UF). Molded parts with a thermoset matrix cannot be reshaped after the P45601PC01 / VIII / mß matrix has cured or cross-linked. However, they exhibit a high temperature operating range and extremely high strength. This is especially true for heat-curing systems that are cured at high temperatures. The polymer mass can also consist of a thermoplastic, such as polyamide (PA). For connectors in plug-in systems with hollow cylindrical molded parts of the type mentioned above, filled polyamide plastics (PA), especially those filled with 50 wt% glass fibers, are often used. Polyamides (PA), which can exist in various compositions depending on their production, are generally classified as engineering plastics, which also include polyethylene terephthalate (PET), polybutylene terephthalate (PBT),Polycarbonate (PC) and polyoxymethylene (POM) are examples. For the aforementioned application as connectors, PA 6.6, PA 11, or PA 12 are often chosen, ensuring cost-effective manufacturing with regard to overall material usage. However, PA 6.6 with, for example, 50% glass fiber content absorbs a high degree of water because the polyamide molecular chains contain polar amide groups that attract polar liquids, such as the dipole molecules of water. This leads to a reduction in strength. Therefore, PA 6.6 has proven unsuitable, particularly for the production of union nuts and bolts as preferred embodiments of hollow cylindrical molded parts of the type mentioned above in motor vehicles, especially commercial vehicles. PA 11 or PA 12 plastics ensure sufficient strength for connectors and low water absorption.which reduces the decrease in strength due to water absorption. However, the strength of these materials decreases relatively significantly at higher temperatures, so that, for example, at the maximum required temperature of 120 °C for P45601PC01 / VIII / mß, sufficient strength for a union screw would no longer be achieved. This also applies to PPA (polyphthalamide), a further development of PA 6.6, which, while exhibiting high temperature resistance and strength approximately 20% higher than PA 6.6, and not absorbing water to the same extent as PA 6.6, also loses considerable strength with increasing temperature. Furthermore, the forces acting on connector components areThese torques are generally lower than the tightening or loosening torques of screws. Therefore, a material suitable for connectors is not necessarily also suitable for a hollow cylindrical component of the type mentioned above. This is also due to the totality of the aforementioned stress concentration factors acting on the outer and inner contours of a hollow cylindrical component of the type mentioned above, particularly a union nut. As mentioned, such stress concentration factors act at changes in diameter, circumferential edges, and / or radii and contribute to the potential shearing off of a hexagon, preferably forming the assembly section, during tightening or loosening. Calculating a union nut made of metal is relatively simple compared to calculating a union nut or bolt made of plastic, as an example of a hollow cylindrical component of the type mentioned above. The latter is considerably more difficult.Since – as already illustrated by the example of the connectors above – many additional parameters must be considered. As already mentioned, the presence of the preferably metallic insert sleeve according to WO 2022 / 136406 A1 allows for sufficient consideration of the very high stress profiles encountered in practice. However, the molded part disclosed therein only offers a partial technical solution to the fundamental objective of reducing manufacturing costs by replacing metallic components, particularly those made of brass, with plastic. Furthermore, the required separate manufacturing and precise placement of the preferably metallic insert sleeve in the injection mold increases manufacturing costs. The present invention therefore aims to provide a hollow cylindrical molded part with an annular cross-section, such as a nut, a socket, a pipe connector, a pipe fitting, or the like.to create a material of the aforementioned type that, with simple technological manufacturability, also ensures high stress-appropriate strength, in particular axial tensile strength, even at elevated temperatures, and prevents premature failure—as described above—without requiring a complete geometric redesign and without the need for inserts, especially metallic inserts. According to the invention, this problem is solved by using a thermoplastic polymer in the fiber-containing plasticized thermoplastic polymeric mass that, in its unplasticized state, exhibits a tensile strength according to ISO 527-2:2012 (test speed: 5 mm / min) of at least 260 MPa. In particular, the tensile strength according to ISO 527-2:2012 (test speed: 5 mm / min) can be at least 280 MPa, and particularly preferably at least 300 MPa. Such polymers are, in particular, polyarylamides (PARA).as they can be described, for example, by the chemical formula below: Due to the presence of ring-shaped aryl constituents in the molecule, this is a semi-aromatic—and also semi-crystalline—polyamide. A semi-aromatic polyarylamide is a polyamide-type polymer containing aromatic groups along its polymer chain. In particular, such polymers can be obtained by the polycondensation of an aromatic diamine and an aliphatic diacid. For example, such semi-aromatic polyarylamides can be obtained by the polycondensation of an aliphatic diacid with 3 to 12 carbon atoms, such as adipic acid, and an aromatic diamine, such as xylenediamine and especially metaxylenediamine. These polymers are also called semi-crystalline polymers because they comprise a crystalline phase, which corresponds to zones within the solidified polymer matrix where the macromolecules are arranged regularly in space.Another, second phase is characterized by a disordered (amorphous) arrangement of the macromolecules. Such partial crystallinity has a beneficial effect with regard to the optimal absorption of a multiaxial stress state, for example in the area of ​​the relief groove when subjected to a turning or unscrewing torque. From FR 2903591 A1, the use of a polyarylamide (PARA) for the production of a working section of a disposable surgical instrument, such as a bone rasp, an acetabular burr, a drill, or a reamer, is known – particularly due to the high hardness of polyarylamide, which, however, plays only a minor role in the present invention.Due to the high hardness of a working section made of PARA – for which the material IXEF® 1022 from Solvay is also mentioned – the known surgical instrument is well suited for working on cartilage or bone. Since it is a single-use instrument, long-term strength is not required. According to the invention, amorphous fibers, such as glass fibers, anisotropic fibers, such as carbon fibers, and / or aramid fibers can be used. Within the scope of the present invention, the plasticized polymer mass can contain a volume fraction of fillers, in particular fibers, in the range of 2.5 to 75 percent, preferably a mass fraction in the range of 30 to 70 percent, particularly 50, 60, or 65 percent by mass, preferably glass fibers, and especially preferably flat glass fibers. The filler content further increases the strength, in particular the tensile strength according to ISO 527-2:2012, compared to the unfilled polymer.The fibers, particularly in the form of glass fibers, preferably flat glass fibers, can have a length in the range of 0.1 mm to 10 mm, preferably in the range of 0.2 mm to 0.5 mm. The fibers can have a mean diameter in the range of approximately 3 μm to 35 μm, preferably in the range of 5 μm to 20 μm. The rectangular cross-sectional shape of flat glass fibers promotes optimal fiber distribution in the injection mold during injection molding and subsequently optimal fiber orientation in the molded part, whereby the fibers in the base body can align themselves predominantly parallel to the axial direction. A flat glass fiber is considered to be one whose wide side in cross-section is 1.5 to 3 times larger than its narrow side. An equivalent mean diameter of the fiber can be easily calculated by dividing the circumference of the cross-section by π.P45601PC01 / VIII / mß Different fiber qualities can be used. With amorphous fibers, the advantage of the fiber shape lies almost exclusively in the utilization of the size effect. The elastic modulus of the compact material and the elastic modulus of the fiber are approximately the same, although the general aim should be for the fibers to exhibit a higher elastic modulus and higher tensile strength in their longitudinal direction than the solidified polymer mass. The elongation at break of the matrix should also be higher than that of the fibers. Amorphous fibers drawn from the melt have the advantage that compressive residual stresses develop on their surface during cooling, which can prevent the formation of fiber initiation cracks. Anisotropic fibers, especially carbon fibers, are used when high strength-to-weight ratios and stiffness are required.Carbon fibers, which typically have a diameter of about 5 to 8 μm and are predominantly made of polyacrylonitrile today, exhibit significantly higher strength and stiffness in the fiber direction than perpendicular to the fiber direction. Their key characteristic is high tensile strength. The use of commercially available flat fibers is also possible. According to the invention, aramid fibers can also be used. Aramids, or aromatic polyamides, are defined by the US Federal Trade Commission as long-chain synthetic polyamides in which at least 85 percent of the amide groups are directly bonded to two aromatic rings. This is therefore a similar or identical material to that which is preferably used for the thermoplastic matrix according to the invention.Aramid fibers, like carbon fibers, have a negative coefficient of thermal expansion, meaning they shorten when heated. Their specific strength and modulus of elasticity are lower than those of carbon fibers. However, in combination with the positive coefficient of expansion of the matrix material, highly dimensionally accurate molded parts can be manufactured. Compared to carbon fiber-containing molded parts, the compressive strength of such parts is lower, and a potentially similar melting point for the fibers and matrix could also prove problematic. With PARA, which, for example, has a mass fraction of 50% glass fibers – where, as mentioned, flat glass fiber is particularly suitable for manufacturing a cap screw – a tensile strength of approximately [value missing] can advantageously be achieved.Strengths of 300 MPa (breaking stress according to ISO 527-2:2012 at a test speed of 5 mm / min), similar to those of aluminum, can be achieved. PARA with 50 wt% glass fiber thus has a strength approximately 40% higher than PA 6.6 and is stable up to at least 120 °C, with comparatively low water absorption. Flat glass fibers, in particular, result in excellent strength properties at an angle of 90° to the flow direction during injection molding. Furthermore, the hollow cylindrical molded part according to the invention can be conditioned, whereby conditioning is understood to mean the controlled absorption of moisture in plastics. The moisture absorption of individual plastics varies considerably, as already indicated above. Non-polar plastics such as polyolefins, styrene polymers, and fluoropolymers absorb very little moisture. Polar plastics such as polyurethane (PUR) or cellulose esters, on the other hand, absorb more water.Polyamides – also known as polyarylamides (PARA) – can be conditioned well with only comparatively low water absorption. For example, the base body of a molded part according to the invention, made from polyarylamide, can have a maximum water absorption of 3.7% in the saturated state at 23 °C, as determined according to ISO 62. However, it is not conditioned to the maximum water absorption capacity, but only until an equilibrium state with the P45601PC01 / VIII / mß environment is reached. Once this state is reached, it remains almost constant in the European climate. Even with an initial maximum water absorption, for example by immersion in water, the base body loses moisture again as soon as it is removed from the water until an equilibrium state is reached. This does reduce the strength to some extent, e.g.The tensile strength and flexural strength are maintained, while preventing potential subsequent deterioration of properties during long-term operation under environmental influences. Other properties, such as the modulus of elasticity, toughness, and the friction and wear properties—particularly important for the thread of the hollow cylindrical component according to the invention—remain constant or are even positively influenced. Conditioning can also reduce the loss of preload after assembly. Polyarylamides (PARA) also form a very smooth surface during injection molding, which is particularly advantageous because it minimizes frictional forces in the thread when screwing the hollow cylindrical component according to the invention in or out.Since the thread is typically manufactured in two mold halves during the injection molding process, two small burrs inevitably form on the thread, particularly at the points where the mold halves abut each other. A further technical measure preferred within the scope of the invention addresses this issue. This measure provides a strip-shaped, axially extending flattening of the thread along its entire length in the area of ​​the joint between the two mold halves. This flattening ensures that any burr formed during injection molding lies within the flattening and thus cannot generate additional frictional forces. According to the invention, and especially when using PARA as the polymer in the plasticized thermoplastic P45601PC01 / VIII / mß polymer mass containing the fibers produced by injection molding, the thread is capable of withstanding the axial forces acting on the thread teeth, particularly shear forces, during tightening or loosening.The inventive design of the base body, using a plasticized thermoplastic polymeric compound in which the polymer exhibits a tensile strength of at least 260 MPa according to ISO 527-2:2012 (test speed: 5 mm / min) in the unplasticized state, allows for a shortening of the fastening section, and in particular, optionally even a shortening of the thread by at least one compared to the known number of turns, i.e., for example, to three axially consecutive turns instead of four turns (tooth tips over the thread length) or to four axially consecutive turns instead of five turns. This, in turn, enables a displacement of the inner contour in the opposite direction of insertion such that the aforementioned extended diameter range of the inner contour moves into the assembly section of the base body, and in particular into the area of ​​a flange-like hexagon of a cap nut or similar component.The screw can be shifted. This increases the minimum wall thickness in the area of ​​the undercut, preventing stress concentrations from causing shearing in the undercut area under the required tightening and loosening torques. Embedding an insert into the base body or a complete geometric redesign is unnecessary. When designing the undercut, it is particularly advantageous if its contour, i.e., the transition from the fastening section to the assembly section, follows a so-called tree root geometry. The design is based on the well-known "thrust triangle method," preferably with additional rounding, as detailed below.P45601PC01 / VIII / mß Injection into the cavity can be carried out in various known ways, for example, from the inside by means of a tunnel, ring, disc, or umbrella gate, wherein at least one two-point gate, preferably up to a five-point gate, and in particular a three-point gate, can be provided in the tunnel gate. Here, injection into the cavity can be carried out through, for example, at least two injection ports that are uniformly distributed circumferentially on the annular inner cross-section of the molded part. However, it can also be preferably provided that the molded part according to the invention is manufactured using an injection molding process which, also in a known manner, provides only one injection point for injecting the polymer mass. Reducing the number of necessary injection points reduces the manufacturing effort.Even with a single injection point, a homogeneous distribution of the polymer mass can be achieved within the base body. In particular, no multiple weld lines form in the polymer material of the base body during production, which could represent weak points. It is also advantageous for the aforementioned manufacturing process if the single injection point for the inner channel of the screw part being produced is located at the end of the mold and angled in such a way that the polymer mass is injected into the closed mold at an angle to the inner channel. Such angled injection offers the advantage that more free space is available for the core part in the area of ​​the inner channel, which is formed by a core part that can be inserted perpendicularly in the insertion direction. This design also makes it possible, in particular, to actively cool the corresponding core part of the mold using core cooling.Core cooling advantageously increases the production speed and extends the service life of the mold, particularly the core. In summary, it can be stated that, advantageously, the following standard values ​​do not need to be changed in a plug connection with a hollow cylindrical molded part according to the invention: Geometry - Thread diameter and pitch; - Maximum length of the plug system in the inner channel; - Flow cross-sections of the received plug parts; Forces and torques - For example, with thread M 22 x 1.5: Breaking torque approx. 30 Nm (double safety factor with a tightening torque of 14 – 15 Nm); - For example, with thread M 16 x 1.5: Breaking torque approx. 20 Nm (double safety factor with a tightening torque of 10 Nm). Further advantageous features of the invention are contained in the dependent claims and in the following description.The invention will be explained in more detail below using a preferred embodiment. Figure 1 shows a top view of an exemplary embodiment of a hollow cylindrical molded part according to the invention, Figure 2 shows a section through the molded part according to the invention shown in Figure 1 along line II-II in Figure 1, Figure 3 shows a perspective view of the molded part according to the invention from Figures 1 and 2, Figure 4 shows a schematic representation of the construction of a transition from a fastening section to an assembly section of a molded part according to the invention, Figure 5 shows a longitudinal section, similar to that in Figure 2, through a molded part not according to the invention, in the assembled state with a connector part, Figure 6 shows a longitudinal section, as in Figure 5, through a molded part according to the invention, in the assembled state with a connector part, Figure 7 shows a section, similar to that in Figure 2, through a molded part not according to the invention, and Figure 8 shows a section for direct comparison with Figure 8.Fig. 7, a section, similar to Fig. 7, through a molded part according to the invention; Fig. 9, a sectional view as in Fig. 2 or Fig. 8, but enlarged; Fig. 10, in a view as in Fig. 6, a longitudinal section through a further embodiment of a molded part according to the invention, in the assembled state with a connector part; Fig. 11, a perspective view of the further embodiment of the molded part according to the invention from Fig. 10. Regarding the subsequent description, it is expressly emphasized that the invention is not limited to the exemplary embodiments and not to all or several features of the described combinations of features; rather, each individual partial feature of the exemplary embodiment(s) can have inventive significance independently of all other partial features described in connection with it, both on its own and in combination with any features of another exemplary embodiment.In the various figures of the drawing, identical parts are always provided with the same reference numerals, so that they are generally described only once. The figures show embodiments of a molded part 1 according to the invention, which—as illustrated in particular by the view in Fig. 1—has an annular cross-section. In detail, it is a hollow screw that can be manufactured by an injection molding process. The molded part 1 has a hollow cylindrical base body 2 with a mounting section MA and with a fastening section BA adjacent to it in the axial direction XX, wherein in one, in particular—as illustrated in Figs. 5 and 6, as well as in Fig.Sections 10 and 11, designed to seal the inner channel 3 of the base body 2, are arranged in the axial direction XX and have different functions. Sections 10 and 11, not further specified, are arranged one after the other in the axial channel 3 of the base body 2, and the base body 2 has at least one internal thread and / or, as shown, an external thread 10 in the fastening section BA. The component 1 according to the invention can be screwed to another component 20 via this external thread 10 in a manner not shown. In the illustrated embodiment, the mounting section MA is designed as a hexagonal flange for possible tool engagement. A transition area from the mounting section MA to the fastening section BA, which adjoins it in the axial direction XX, is called a relief groove and is symbolized in the drawing by the reference numeral FS.The sections in the inner channel 3 can serve to accommodate one or more circumferential seals 5, 6, which may be located in particular on the connector part 4, as well as for the direct or indirect retention and / or locking of the connector part 4 and / or, in a conical or cylindrical form, for supporting and / or guiding the connector part 4, whereby they may in particular have different inner diameters. It should also be noted that the inner channel 3 tapers in the insertion direction S of the connector part 4, in particular in a stepped or continuous manner, whereby the inner diameter remains constant in some sections. Thus, with an approximately constant outer diameter in the axial direction XX, different wall thicknesses result.To produce a molded part 1 according to the invention, a fiber-containing plasticized polymeric mass M is injected through at least one injection opening of a (not shown) mold into a cavity of the mold, and after the polymeric mass has solidified, the molded part 1 is demolded from the mold. The fact that the base body 2 is thus produced from a plasticized thermoplastic polymeric mass M containing fibers F, produced by injection molding, is visualized by the circular cutout in the lower right of Fig. 2. According to the invention, the thermoplastic polymer of the fiber-containing plasticized thermoplastic polymeric mass M is one which, in the unplasticized state, exhibits a tensile strength according to ISO 527-2:2012 (test speed: 5 mm / min) of at least 260 MPa.In particular, the polymer of the plasticized thermoplastic polymeric mass M containing fibers F can be one which, in the non-plasticized state, exhibits a tensile strength according to ISO 527-2:2012 (test speed: 5 mm / min) of at least 280 MPa, preferably 300 MPa. In particular, the polymer of the plasticized thermoplastic polymeric mass M containing fibers F can be a polyarylamide (PARA). As already mentioned, the polyarylamide (PARA) can be produced by polycondensation of a P45601PC01 / VIII / mβ aromatic diamine and an aliphatic diacid, in particular by polycondensation of an aliphatic diacid with 3 to 12 carbon atoms, such as adipic acid, and an aromatic diamine, such as xylenediamine, and in particular metaxylenediamine, whereby the polymer of the fiber F containing plasticized thermoplastic polymeric mass M is in particular a semi-aromatic and / or semi-crystalline plastic.Fiber-reinforced plastics with a thermoplastic matrix can be subsequently formed or welded. After cooling, the molded parts 1 are ready for use, but soften at elevated temperatures. Their tendency to creep decreases with increasing fiber content. The advantage of PARA lies particularly in its high matrix strength and suitability for use under elevated temperature loads. As already mentioned above, the plasticized polymer mass M can contain a volume fraction of fibers F in the range of 2.5 to 75 percent, preferably a mass fraction in the range of 30 to 70 percent, particularly 50, 60, or 65 percent by mass, preferably glass fibers, and especially flat glass fibers. The filler content further increases the strength, particularly the tensile strength according to ISO 527-2:2012, compared to the unfilled polymer.The fibers F, particularly in the form of glass fibers, preferably flat glass fibers, can have a length in the range of 0.1 mm to 10 mm, preferably in the range of 0.2 mm to 0.5 mm. The fibers F can have a mean diameter in the range of approximately 3 μm to 35 μm, preferably in the range of 5 μm to 20 μm. Flat glass fibers have an approximately elliptical cross-section (rounded rectangles) and thus possess a major and a minor semi-axis. As a first approximation, the mean diameter can be considered to be half the sum of the two semi-axes. P45601PC01 / VIII / mß Examples of such materials are the materials available commercially under the names AKROLOY® PARA GF 50 HU black (8596) and AKROLOY® PARA FGF 501 black (8186), which in both cases are polyarylamides reinforced with 50 mass-% glass fiber.Even in their conditioned state, these materials impress with their very high strength due to their low moisture absorption. Furthermore, these materials stand out during processing due to their excellent flowability and in the finished product due to their high surface quality. In the second material mentioned, the PARA is reinforced with flat glass fibers, which further improves the flow properties during injection molding. Important properties of AKROLOY® PARA GF 50 HU black (8596) are presented as examples in Tables 1 to 3 below – categorized according to general properties (Table 1), mechanical properties (Table 2), and thermal properties (Table 3). For the ISO standards listed in the tables for determining the respective parameters, the versions valid at the time of filing must be observed. For tensile strength and elongation at break, this is version ISO 527-2:2012.Table 1: General properties Density 23 °C 1.65 g / cm³. 3 ISO 1183 Moisture absorption 70 °C, 62% RH 0.8% Equilibrium ISO 1110 Water absorption 23 °C, saturated 3.5% Saturation ISO 62 Processing shrinkage longitudinal 0.1 - 0.2% ISO 294-4 transverse 0.2 - 0.4% P45601PC01 / VIII / mß Table 2: Mechanical properties Tensile modulus 1 mm / min dry 19700 MPa ISO 527-2 1 mm / min conditioned 19700 MPa Tensile strength 5 mm / min dry 295 MPa ISO 527-2 5 mm / min conditioned 270 MPa Elongation at break 5 mm / min dry 2.0% ISO 527-2 5 mm / min conditioned 2.0% Charpy Impact strength 23 °C dry 78 kJ / m 2 ISO 179-1 / 1eU 23 °C conditioned 90 kJ / m² 2 -30 °C dry 60 kJ / m² 2 Charpy 23 °C dry 15 kJ / m² 2 Impact strength at 23 °C, conditioned: 14 kJ / m 2 ISO 179-1 / 1eA -30 °C dry 17 kJ / m 2Table 3: Thermal Properties Heat deflection temperature 1.8 MPa 230 °C HDT / A ISO 75 Heat deflection temperature 8 MPa 200 °C HDT / C ISO 75 Glass transition temperature DSC, 2nd heating 87 °C ISO 11357-2 Melting point DSC, 10 K / min 238 °C ISO 11357-3 The parameters of AKROLOY® PARA FGF 501 differ only slightly from those of AKROLOY® PARA GF 50 HU black (8596). In particular, the tensile strength (see Table 2) in the dry condition (ISO 527-2:2012 / test speed: 5 mm / min) of both materials is completely identical and is 295 MPa. Conditioning, whereby in the saturated state at 23 °C the maximum water absorption determined according to ISO 62 can be only 3.5% (see P45601PC01 / VIII / mß Table 1), advantageously leads to a strength reduction of no more than 11% for both materials.The melting point listed in Table 3 according to ISO 11357-3 (DSC, 10 K / min) makes both materials ideal for processing the plasticized thermoplastic polymer mass, particularly in the temperature range of approximately 270 °C to 300 °C. For high component stability, it has proven advantageous to inject the material into the cavity in such a way—for example, near the end faces of the molded part 1—that the fibers F in the base body 2 align themselves predominantly parallel to the axial direction XX, i.e., to more than 50 percent in the case of glass fibers, in a manner favorable for the torsional stress that later occurs when screwing in a screwing tool. This can be verified, for example, by computed tomography X-ray analysis.It should be noted that, although a torsional moment is applied by the tool under the aforementioned stress, mechanical axial stresses also arise due to the forces occurring in the thread of the screw part 1 during screwing in, so that a triaxial stress state with high axial forces occurs in the maximally loaded area near the point of force application. The perspective view of the molded part 1 according to the invention shown in Fig. 3 illustrates an advantageous embodiment of the invention, according to which, particularly in the area of ​​a joint between two mold halves used for injection molding the plasticized thermoplastic polymer mass containing the fibers F, a strip-shaped flattening 12 extending axially along the length of the thread is provided on the thread 10, so that any burr formed during injection molding lies in this flattening 12.Axial stress components occurring during the assembly of the molded part 1 according to the invention in the base body are thereby minimized, while significant frictional forces during screwing in or out are also largely avoided. P45601PC01 / VIII / mß Fig. 4 illustrates a previously mentioned construction, preferably to be used within the scope of the invention, for obtaining a so-called tree root geometry for the undercut FS. The construction is carried out—not, as is also known, by a circular arc segment, in particular a quarter-circle segment, but—in the following way: First, in a first step, a construction line “a” is created, which is at an angle µK to the assembly section MA, wherein the angle µK can be in the range between 30° and 60°, preferably at 45°. In the second step, a construction line “b” is created, which originates from the center of the hypotenuse of the triangle formed in the first step.This construction line "b" is extended either to assembly section MA or to fastening section BA in such a way that another triangle is formed. In the third step, a construction line "c" is created, originating from the midpoint of the hypotenuse of the triangle formed in the second step, again creating a triangle, particularly an isosceles triangle, as shown in Fig. 4. This construction method is known per se and is called the "method of pull triangles." In a final fourth step, the endpoints EP and FP of construction lines "c" and "a" are connected by an arc line, which approximately rounds the polygonal structure formed in the first three steps and then forms the contour of the undercut FS. Several circular arcs, which tangentially merge into one another, can also be used for this purpose. Radii corresponding to such circular arcs are labeled R1, R2, R3, and R4 in Fig. 4.Likewise, the design is not limited to three construction lines, but any further number can be added, preferably depending on the angle µK. A contour created in this way, which reduces notch stresses, advantageously increases the torsional moment that the inventive component 1 can withstand when screwed into the component by up to approximately 20 percent compared to a component with the conventional simple circular arc shape. In Figures 5 and 6 (each with connector 4) as well as in Figures 7 and 8 (each on its own), a non-inventive component 1' and an inventive component 1 (P45601PC01 / VIII / mß) are compared, each with identical inner and outer diameters and identical lengths L', L' (unspecified). The reference numerals denote details corresponding to the invention in the non-inventive embodiment.The non-inventive molded part 1' is designed according to the teaching of WO 2022 / 136406 A1, according to which the screw part has a hollow cylindrical base body 2' injection-molded from a fiber-containing plasticized polymeric mass, in which a preferably metallic insert sleeve EH is arranged in a characteristic manner coaxially to its inner channel 3'. With the invention, this feature can be dispensed with, whereby, with technologically simple manufacturing, high stress-appropriate strength, in particular axial tensile strength, can be ensured even at elevated temperatures, and premature failure can be prevented. With regard to their position, the non-inventive molded part 1' and the inventive molded part 1 coincide in Figures 5 and 6 as well as in Figures 7 and 8 in the plane of the transition from the fastening section BA', BA to the assembly section MA', MA.The inventive design of the base body 2, using a plasticized thermoplastic polymeric compound M in which the polymer, in its unplasticized state, exhibits a tensile strength according to ISO 527-2:2012 (test speed: 5 mm / min) of at least 260 MPa, allows for a reduction in the length of the fastening section (from LB' to LB). This, in turn, enables a displacement of the inner contour in the opposite direction of insertion, such that an extended, for example conical, diameter region DE' of the inner contour, which in a non-inventive molded part 1' lies in the area of ​​the transition from the fastening section BA' to the assembly section MA', can be displaced into the assembly section MA of the base body 2 by an amount that is marked with the reference numeral ΔX in Fig. 5 / 6 (diameter region DE). It thereby reaches, in particular, the area of ​​the flange-like hexagon of the exemplary capping part 1.The wall thickness W in the area of ​​the undercut FS is thus increased compared to the known molded part 1' (W' at the location FS') (W > W'), so that a torsional moment required for assembly and / or disassembly, as well as notch factors, can no longer act in such a way that tearing in the area of ​​the undercut FS is possible. While maintaining the overall length L', L of the molded parts 1', 1, which is based on a length of the inner contour that cannot be changed structurally, shortening the fastening section (BA' to BA) can be accompanied by lengthening the assembly section (MA' to MA). Significantly, in Figures 6 and 8, the fastening sections BA according to the invention (each on the left in the image) are shorter than the non-inventive fastening sections BA' (each on the left in Figures 5 and 7), and the assembly sections MA according to the invention (each on the right in Figure 8) are longer.6 and 8) are longer than the non-inventive fastening sections BA' (each on the right in Figs. 5 and 7). While for a non-inventive molded part 1' the ratio of the length LB' of the fastening section BA' to the total axial length L' (sum of LB' and LM' as the length of the mounting section MA') is in the range of 60% to 80%, preferably about 65%, for a molded part 1 according to the invention the ratio of the length LB of the fastening section BA to the total length L (sum of LB and LM as the length of the mounting section MA') is in the range of only 38% to 57%, preferably about 54%. In Fig. 9, the reference numerals T1 and T2 denote wall thicknesses in the base body 2. The wall thickness T2 is at least 70% of the wall thickness T1 in the fastening section BA from any point of the undercut FS, wherein the wall thickness T1 in the fastening section BA extends from the base of the thread 10 to the wall surrounding the inner channel 3.In particular, the wall thickness T2, which also corresponds to the wall thickness W in Fig. 8, is at least 80%, preferably at least 85%, of the wall thickness T1 in the fastening section BA, wherein the wall thickness T2 extends axially – starting from the end of the thread 10 – in particular over a region P45601PC01 / VIII / mß of up to at least 20% of a length L1 into the region of the mounting section MA, preferably up to at least 25%, 30%, or 40% of the length L1. The length L1 denotes a region in which the mounting section MA is designed as a flange – in particular a multi-sided one. Fig. 10 shows – as already mentioned – a longitudinal section through a further embodiment of a molded part 1 according to the invention, namely in the assembled state with a plug part 4, and together with this inserted into a connecting bore of a further component 20 which carries an internal thread 22.In contrast to the first embodiment of the invention, where the inner channel 3 tapers in the insertion direction S of the connector part 4, in particular in a stepped or continuous manner, with the inner diameter remaining constant in at least some sections, the inner channel 3 of the molded part 1 according to Fig. 10 has a constant inner diameter over almost its entire length. However, this does not preclude the fact that, in the inner channel 3 intended for the sealing reception of a connector part 4, XX sections with different functions are arranged one after the other in the axial direction. Starting from the insertion side of the molded part 1 for the connector part 4, this is initially a section with a recess, in particular designed as a circumferential taper (inclined surface SF1 in Figs. 10 and 11), for visual inspection to ensure correct insertion. Adjoining this section is the sealing area for the contact of the dirt seal 6.All existing seals 5, 6, 11 themselves are not shown in Fig. 10 – unlike in Fig. 6 – however, the corresponding groove 6A for receiving the dirt seal 6 is clearly visible. Furthermore, a comparatively short support area for the connector part 4 follows, which is then followed by a section that serves as another sealing area, specifically for the media seal 5. However, only the corresponding receiving groove 5A is shown. Finally, a comparatively long support area for the shaft of the connector part 4 forms the end. The sealing areas and the support areas have the same diameter. The two support areas can also be considered a single support area, interrupted only by the sealing area for the media seal 5. The sealing surface 11A for the circumferential seal 11 lies on the outer diameter of the molded part 1 in the area of ​​the undercut FS. For assembly of the components shown in Fig.In the connection shown in Fig. 10, a spring element 30 is first inserted into the connecting bore of the further component 20 – specifically, below the base of a mating thread 22 for the thread 10 of the molded part 1. Next, a retaining clip 8A is inserted, which is an alternative to the locking cage 8 shown in Fig. 8. The retaining clip 8A is inserted so that it lies flat against the base of the mating thread (internal thread 22). The spring element 30 and retaining clip 8A are, in particular, ring-shaped and symmetrical. Subsequently, the molded part 1, on which a greased O-ring has already been pre-mounted as a circumferential seal 11 at the sealing position 11A, is screwed into the threaded bore and tightened. A design in the area of ​​the undercut FS, as described above, ensures an optimal, and in particular notch-free, stress distribution in the base body 2 when the torsional moment is applied. Finally, the connector part 4 is inserted.An outer ring bead 7, as mentioned below, for interaction with the retaining clip 8A is not provided on the base body 2 of the molded part 1 here – unlike the embodiment in Fig. 6. Instead, the retaining clip 8A engages below the molded part 1 in a circumferential groove on the outer diameter of the connector part 4, with the tip of the connector part 4 being supported on or in the spring element 30, as shown in Fig. 10. The correctly executed mating process is then checked by sliding a test fork under a circumferential collar 41 on the connector part 4, which is provided as standard, and then attempting to pull the connector part 4 out of the molded part 1 with the test fork. If the dirt sealing ring 6, which is preferably in a warning color such as red, can be seen because it is located above the molded part 1, the insertion process has not been carried out correctly.In comparison to known brass hollow screws, the length LM of the assembly section MA in a molded part 1 made of plastic according to the invention is greater; in particular, the head or hexagon of the plastic part is taller. This length LM is one of the few dimensions of the molded part 1 that can be modified to a limited extent, while the connector part 4 must not be geometrically altered. The inner contour of the hollow screw remains the same as that of a brass hollow screw up to the transition from SF2 to SF1. The transition from SF2 to SF1 essentially indicates the original length LM (old) of the brass hollow screw.This reduces the axial distance between the circumferential collar 41 on the connector part 4 and the end face of the molded part 1 facing the connector part 4, compared to a brass part in the plug connection 4 / 1. This can lead to the dirt sealing ring 6 not being visible even if the connector part 4 is not fully inserted, because it is still located in the raised part of the assembly section. The recess, designed as a circumferential taper – inclined surface SF1 in Figs. 10 and 11 – offers a technical solution to this problem. If the connection is not inserted correctly, the sealing ring 6 can be seen. However, the conical recess should be designed within a specific angular range (μ1 in Fig. 11), because if the angle μ1, starting from the transition SF2 to SF1, is too steep, the diameter of the recess SF1 on the end face of the hollow screw approaches the diameter of the collar, and the installer may not be able to see the seal.The countersink in P45601PC01 / VIII / mm is not visible because it is overlooked by the collar 41 on the connector part 4. An incorrect insertion might not be detected. If the angle μ1, starting from the transition of the radial width (BR), is too steep, SF1 would be too deep, and the sealing ring 6 might still be visible even with a correctly executed insertion. In such a case, the position of SF2 would also be incorrect. If the countersink, starting from the transition SF2 to SF1, is too shallow, the countersink SF1 extends so close to the outer diameter of the mounting section MA that the stability achieved by the additional height of the mounting section MA compared to a brass union nut is lost. If the countersink SF1, starting from the annular edge of the end face (RR), is too shallow, the dirt sealing ring 6 might not be visible even with a correctly executed insertion and could be located in the cylindrical area of ​​the inner channel.From this perspective, the angle µ1 between the inclined surface SF1 and the longitudinal axis XX (Fig. 11) should be in the range between 30° and 70°, preferably at 60°. An annular rim RR remaining next to the inclined surface SF1 should have a radial width BR that is not less than half the radial width BF of the entire end face of the base body of the molded part 1, i.e., the sum of the area of ​​the annular rim RR and the area of ​​the axial projection of the inclined surface SF1. In order to further improve the visibility of the dirt ring seal 6 required for visualizing the plug-in state, a second inclined surface SF2 is provided, in particular as a partial surface of the aforementioned inclined surface SF1, which is then to be referred to as the first inclined surface, and which is arranged at an angle µ2 between the inclined surface SF2 and the longitudinal axis XX (Fig.11) in the area P45601PC01 / VIII / mß between 25° and 35°, preferably at 30°.The conical recess is then a double cone. The inclined surface(s) SF1 – and optionally SF2 – of the molded part 1 can be easily generated during injection molding by means of a complementary conical contour of the injection mold 100. The invention is not limited to the illustrated embodiments, but also includes all embodiments that have the same effect in the sense of the invention, for example, those with an internal thread in the inner channel 3. Furthermore, those skilled in the art can provide additional advantageous technical measures without departing from the scope of the invention. For example, in the first illustrated embodiment, a particularly delicate outer ring bead 7 is located in a terminal retaining section on the outer circumference of the base body 2, on which a component shown in Fig. 4 is attached for the indirect retention and / or locking of the connector part 4.The locking cage 8, preferably annular, shown in Figures 5 and 6, is attachable, in particular snap-on, and interacts with at least one locking element 9 on the connector part 4. This indirect retention and / or locking can be implemented in various ways, for which full reference is made to EP 0913618 B1. The invention is not limited to the combination of features defined in independent claim 1, but can also be defined by any other combination of specific features from all the individual features disclosed. This means that, in principle, virtually any individual feature of the independent claim can be omitted or replaced by at least one individual feature disclosed elsewhere in the application. P45601PC01 / VIII / mß In this respect, the claims are to be understood merely as a first attempt at formulating an invention.

[0002] P45601PC01 / VIII / mß Reference numeral list 1 Molded part, according to the invention 1' Molded part, not according to the invention (Fig. 7) 2 Base body of 1 2' Base body of 1' (Fig. 7) 3 Inner channel of 1 3' Inner channel of 1' (Fig. 7) 4 Connector part (Fig. 5, 6) 5 Circumferential seal, media seal 5A Groove for 5 (Fig. 10) 6 Circumferential seal, dirt seal 6A Groove for 6 (Fig. 10) 7 Outer ring bead on 2 (Fig. 8) 7' Outer ring bead on 2' (Fig. 7) 8 Locking cage for 4 (Fig. 5, 6) 8A Retaining clip for 4 (Fig. 10) 9 Locking element on 4 (Fig. 5, 6) 10 External thread in BA 10' External thread in BA' (Fig. 7) 11A Sealing space for Circumferential seal in FS (Fig. 10) 12 Flattening of 10 20 Component with connection bore 22 Internal thread in 20, mating thread to 10 30 Spring element 41 Circumferential collar on 4 (Fig. 10) a, b, c Construction lines (Fig. 4) BA Fastening section of 1 BA' Fastening section of 1' (Fig.7) BF radial total width of end face of 1 P45601PC01 / VIII / mm BR radial width of RR FS undercut of 1 DE extended inner contour of 1 (diameter range) DE' extended inner contour of 1' (Fig. 7) EH insert sleeve (Fig. 5, 7) EP end point of c (Fig. 4) F fibers FP end point of a (Fig. 4) FS' undercut of 1' (Fig. 7) L length of 1 L' length of 1' (Fig. 7) L1 length flange area in MA (Fig. 9) LB length of BA LB' length of BA' (Fig. 7) M polymer mass MA assembly section of 1 MA' assembly section of 1' (Fig. 7) R1, R2, R3, R4 circular arc radii (Fig. 4) RR ring edge of end face of 1 S insertion direction of 4 into 1 S' insertion direction of 4 into 1' (Fig. 7) SF1 First inclined surface in MA SF2 Second inclined surface in MA T1 Wall thickness in BA (Fig. 9) T2 Wall thickness of FS (Fig. 9) W Wall thickness of FS (Fig. 6, 8) W' Wall thickness of FS' (Fig. 5, 7) ΔX Displacement Fig. 5 / 6 XX Longitudinal axis of 1, 1' µ1 Angle between SF1 and XX (Fig. 11) P45601PC01 / VIII / mß µ2 Angle between SF2 and XX (Fig.11) µK Construction angle (Fig.4).

Claims

P45601PC01 / VIII / mß Claims 1. Hollow cylindrical molded part (1) with an annular cross-section, such as a screw, a nut, a socket part, a pipe plug, a pipe connector or the like, wherein the molded part (1) has a hollow cylindrical base body (2) with a mounting section (MA) and with a fastening section (BA) adjoining it in the axial direction (XX), wherein in an inner channel (3) of the base body (2), in particular for the sealing reception of a plug part (4), sections with different functions are arranged one another in the axial direction, and wherein the base body (2) has at least one internal thread and / or one external thread (10) and is produced by injection molding a plasticized thermoplastic polymeric mass (M) containing fibers (F), characterized in that the thermoplastic polymer of the plasticized thermoplastic polymeric mass (M) containing fibers (F) is such thatwhich, in the non-plasticized state, exhibits a tensile strength according to ISO 527-2:2012 (test speed: 5 mm / min) of at least 260 MPa.

2. Molded part (1) according to claim 1, characterized in that the polymer of the plasticized thermoplastic polymeric mass (M) containing fibers (F) is one which, in the non-plasticized state, exhibits a tensile strength according to ISO 527-2:2012 (test speed: 5 mm / min) of at least 280 MPa, preferably 300 MPa. P45601PC01 / VIII / mß 3. Molded part (1) according to claim 1 or 2, characterized in that the polymer of the fiber-containing (F) plasticized thermoplastic polymeric mass (M) is a polyarylamide (PARA).

4. Molded part (1) according to claim 3, characterized in that the polyarylamide (PARA) of the fiber-containing (F) plasticized thermoplastic polymeric mass (M) is a polycondensate of an aromatic diamine and an aliphatic diacid, in particular a polycondensate of an aliphatic diacid with 3 to 12 carbon atoms, such as adipic acid, and an aromatic diamine, such as xylenediamine, and in particular metaxylenediamine.

5. Molded part (1) according to one of claims 1 to 4, characterized in that the polymer of the plasticized thermoplastic polymeric mass (M) containing fibers (F) is a semi-aromatic and / or semi-crystalline plastic. 6.Molded part (1) according to any one of claims 1 to 5, characterized in that the plasticized polymer mass (M) contains a volume fraction of fibers (F) in the range of 2.5 to 75 percent, preferably a mass fraction in the range of 30 to 70 percent, in particular 50, 60 or 65 percent by mass, of glass fibers, preferably in an embodiment as flat glass fibers.

7. Molded part (1) according to any one of claims 1 to 6, characterized in that the fibers (F), in particular in an embodiment as glass fibers, preferably in an embodiment as. P45601PC01 / VIII / mß Flat glass fibers, having a length in the range of 0.1 mm to 10 mm, preferably in the range of 0.2 mm to 0.5 mm.

8. Molded part (1) according to any one of claims 1 to 7, characterized in that the fibers (F) have a mean diameter in the range of about 3 μm to 35 μm, preferably in the range of 5 μm to 20 μm.

9. Molded part (1) according to any one of claims 1 to 8, characterized in that the base body (2) is conditioned.

10. Molded part (1) according to one of claims 1 to 9, characterized in that, particularly in the area of ​​a joint between two mold halves used for injection molding the plasticized thermoplastic polymeric mass containing the fibers (F), a strip-shaped flattening (12) extending axially along the length of the thread is provided on the external thread (10), so that any flash formed during injection molding lies in this flattening (12). 11.

12. Molded part (1) according to any one of claims 1 to 10, characterized in that the external thread (10) has three to six turns arranged one behind the other in the axial direction (XX).

12. Molded part (1) according to any one of claims 1 to 11, characterized in that, in the transition from the fastening section (BA), which in particular carries an external thread (10), to the axially adjoining assembly section (MA), which has a larger diameter than the fastening section (BA) and is in particular designed as a flange-like polygon, the base body (2) has a thread-free area, which is referred to as a relief groove (FS). P45601PC01 / VIII / mß 13. Molded part (1) according to claim 12, characterized in that the contour of the undercut (FS) is designed according to a so-called tree root geometry using the "method of tension triangles", preferably with additional rounding.

14. Molded part (1) according to any one of claims 1 to 13, characterized in that the ratio of a length (LB) of the fastening section (BA) to an axial total length (L) summarily formed from a length (LB) of the fastening section (BA) and a length (LM) of the mounting section (MA) is in the range of 38% to 57%, preferably around 54%. 15.A molded part (1) according to one of the preceding claims, characterized in that a wall thickness (T2) in the area of ​​a / the undercut (FS) corresponds to at least 70%, in particular at least 80%, preferably at least 85%, of a wall thickness (T1) in the fastening section (BA), wherein the wall thickness (T1) in the fastening section (BA) extends from the base of the thread (10) to the wall surrounding the inner channel (3). A molded part (1) according to claim 15, characterized in that the wall thickness (T2) in the area of ​​the undercut (FS) extends axially from the end of the thread (10) over a length (L1) of at least 20%, preferably at least 25%, 30%, or 40% in the area of ​​the mounting section (MA), in which the mounting section (MA) is designed as a flange.

17. Molded part (1) according to one of claims 1 to 16, characterized in that the inner channel (3) has a constant inner diameter. P45601PC01 / VIII / mß 18. Molded part (1) according to any one of claims 1 to 16, characterized in that the inner channel (3) tapers in the insertion direction (S) of the connector part (4), in particular in a stepped or continuous manner, wherein the inner diameter of the inner channel (3) remains constant at least in some sections.

19. Molded part (1) according to any one of the preceding claims, in particular according to claim 17, characterized in that the inner channel (3) has a conical recess with a circumferential inclined surface (SF1) for the connector part (4), starting from the insertion side of the base body (2) of the molded part (1).

20. Molded part (1) according to claim 19, characterized in that an angle (µ1) between the inclined surface (SF1) and the longitudinal axis (XX) of the base body (2) lies in the range between 30° and 70°, preferably at 60°. 21.Molded part (1) according to claim 20, characterized in that an annular rim (RR) remaining next to the inclined surface (SF1) has a radial width BR which is not less than half the radial width (BF) of the entire end face of the base body (2), wherein the end face is formed as the sum of the area of ​​the annular rim (RR) and the area of ​​the axial projection of the inclined surface (SF1).

22. Molded part (1) according to any one of claims 19 to 21, characterized in that the inner channel (3) has a double-conical recess for the connector part (4) starting from the insertion side of the base body (2), with a first inclined surface (SF1) and with a second inclined surface (SF2), which is designed in particular as a partial surface of the first inclined surface (SF1). P45601PC01 / VIII / mß 23. Molded part (1) according to claim 22, characterized in that an angle (µ2) between the second inclined surface (SF2) and the longitudinal axis (XX) of the base body (2) lies in the range between 25° and 35°, preferably at 30°.

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