Kit for providing a one-way torque nut for a bolted connection

Abstract

Kit (10) for providing a one-way torque nut (10') for a bolted connection, wherein the torque nut (10') is formed by - a screw part (12) having a threaded section (14), and - a drive part (16, 16') that can be coupled to the screw part (12) to transmit torque, wherein the drive part (16, 16') has an attachment area (22) for a torque-applying tool, wherein the screw part (12) and the drive part (16, 16') each have a configuration (K1, K2, K2') of positive locking elements (26, 28, 28') which are configured to form a positive locking element pairing in the coupled state of screw part (12) and drive part (16, 16') and to transmit the torque applied to the nut (10'), and wherein the kit comprises several screw parts (12) with relatively different configurations (K1) of positive locking elements (26), and / or several drive parts (16, 16') with relatively different configurations (K2, K2') of positive locking elements (28, 28'), wherein the positive locking element pairings that can be formed from the configurations (K1, K2, K2') differ in how much torque can be transmitted until the positive locking element pairing fails.

Description

[0001] The invention relates to a kit for providing a disposable torque nut for a screw connection, wherein the torque nut is formed by a screw part having a threaded section, and a drive part that can be coupled to the screw part to transmit torque, wherein the drive part has an attachment area for a tool that applies torque.

[0002] Disposable torque nuts for creating torque-limited screw connections are well-known in the art and are used, for example, in the assembly or fastening of various components and parts. In particular, such disposable torque nuts can be used when installing a sealing device that seals a pipe passing through an opening in a wall section against the opening. In such a kit for providing a disposable torque nut for a screw connection, a torque nut, typically intended for single use, is formed by a screw part with a threaded section. This screw part, with its threaded section, interacts with a screw part, together forming a screw connection.The screw part, which can be designed as a screw bolt for example, has a threaded section that is complementary to the threaded section on the screw part.

[0003] Furthermore, the torque nut is formed by a drive element that can be coupled to the screw part to transmit torque. On known one-way torque nuts, the drive element has a receptacle for coupling to a coupling section on the screw part, which interact with each other in a positive-locking manner. The receptacle on the drive element and the coupling section on the screw part engage with each other, particularly for torque transmission. The drive element also has a contact area for a tool that applies torque. On the drive element, the receptacle for coupling to the screw part is partially connected to the contact area for the tool via torque-transmitting webs, which are designed to fail when a maximum torque to be transmitted in the direction of the receptacle is reached or exceeded.The failure of the retaining tabs interrupts the torque-transmitting connection between the tool insertion area and the receptacle for the screw part.

[0004] A kit like this, designed to provide a disposable torque nut, can typically only generate a single, predetermined torque. It would often be desirable to use the kit to reliably generate different torque values ​​on a screw connection, particularly on a multitude of screw connections on a single component, such as a sealing device located within an opening in a wall section, in order to increase its versatility. With torque nuts known in the prior art, controlled tightening of a screw connection with varying torque values ​​is virtually impossible, even for an experienced user.

[0005] Therefore, the invention was based on the objective of demonstrating a kit for providing a disposable torque nut, by means of which different torque values ​​can be generated in a simple and safe manner and transferred to a screw part of the screw connection.

[0006] The invention solves the underlying problem in a kit for providing a disposable torque nut for a screw connection with the features of claim 1. In particular, the screw part and the drive part each have a configuration of positive locking elements which are configured to form a positive locking element pairing in the coupled state of the screw part and the drive part and to transmit the torque applied to the nut, and wherein the kit has several screw parts with relatively different configurations of positive locking elements and / or several drive parts with relatively different configurations of positive locking elements, wherein the pairings that can be formed from the configurations differ in how much torque can be transmitted until a failure of the positive locking element pairing.

[0007] The invention is based on the finding of providing a kit for a one-way torque nut for a screw connection, which comprises either several, at least two, screw parts and a drive part or one screw part and several, at least two, drive parts, and wherein either the several screw parts or the several drive parts have different configurations of positive locking elements relative to each other, such that when the screw parts with their different configurations of positive locking elements are brought into contact with the single drive part or the several drive parts with their different configurations of positive locking elements with the single screw part, different torques can be transmitted from the single drive part to the several screw parts or from the several drive parts to the single screw part by means of the pairings of positive locking elements that can be formed from the configurations.Using a kit according to the invention for providing a disposable torque nut for a screw connection, it is particularly possible to tighten a screw connection with different torque values ​​in a controlled manner. For example, with one of the pairings of positive locking elements that can be formed from the configurations, a torque of 3 Nm is transmitted from the (single) drive part to the first screw part. With the other pairing of positive locking elements, a torque of 5 Nm can be transmitted from the drive part to the second screw part before the respective pairings of positive locking elements of the drive part and screw part fail or trigger. Preferably, the screw part has a threaded section, in particular an internal threaded section, which is complementary to a threaded section on a screw part that contributes to forming the screw connection.

[0008] According to a preferred embodiment of the kit according to the invention, several screw parts are provided, wherein the configurations of the positive locking elements on the screw parts differ in one, several, or all of the following parameters: number of positive locking elements, shape of the positive locking elements, and in the design of weakening points on the positive locking elements. In particular, by adjusting the number of positive locking elements on the several screw parts, changing the shape of the positive locking elements formed on the several screw parts, or by different design of weakening points on the positive locking elements of the several, at least two, screw parts, a structurally simple way of changing the torques that can be transmitted by means of the several screw parts and the one drive part is achieved.Depending on the magnitude of the torque to be generated at the bolted joint, the user selects the appropriate screw component and engages the threaded sections on the screw component and the screw component intended for forming the bolted joint. In a preferred embodiment, only the screw components with their relatively different configurations of positive locking elements are designed to release the torque-transmitting coupling with one and the same drive component at different torque levels.

[0009] A further development of the kit according to the invention provides for several drive parts, wherein the configurations of the positive locking elements on the drive parts differ in one, several, or all of the following parameters: number of positive locking elements, shape of the positive locking elements, and in the design of weak points on the positive locking elements. Providing several drive parts and only one screw part further simplifies the provision of a kit for producing a one-way torque nut for a screw connection, since this makes it possible to pre-assemble the screw connection to be produced with a single screw part, for example, on a sealing device for sealing a pipe against an opening in a wall section. Furthermore, by adjusting the number of positive locking elements on the several drive parts, or...Changing the shape of the positive locking elements formed on the multiple drive parts, or different configurations of weak points on the positive locking elements of the multiple, at least two, drive parts, provides a structurally simple way to change the torques that can be transmitted by means of the multiple screw parts and the single drive part. In a preferred embodiment, only the drive parts with their relative different configurations of positive locking elements are configured to disengage the torque-transmitting coupling with one and the same screw part at different torque levels.

[0010] In a preferred embodiment of the invention, the drive part and the screw part each have a longitudinal axis which is essentially coaxial with each other in their operative connection. The coaxial alignment of the longitudinal axes of the screw part and drive part in their respective operative connection simplifies the engagement of the drive part with its positive locking elements with the screw part and its positive locking elements formed thereon. Preferably, each configuration of positive locking elements has a uniform design on a respective screw or drive part, allowing the drive part to be brought into operative connection with the screw part in any desired orientation.Instead of having to pay attention to a specific alignment of the drive part and the plug part relative to each other, the respective drive part to be used for the intended positive locking element pairing can be coupled to the screw part without additional alignment effort.

[0011] In a preferred embodiment, several drive components with relatively different configurations of positive locking elements are arranged at opposite ends of a multi-drive component. Instead of having to handle several separate drive components to transmit different torques to the screw component, the single multi-drive component, now comprising several drive components, simplifies the tightening of the screw connection. Preferably, at least two drive components are combined to form a multi-drive component, and more than two such drive components can also be combined to form a multi-drive component, which are then particularly arranged in a star-shaped configuration.If necessary, the multi-drive unit itself, with its multiple drive units, each having a different number of positive locking elements for transmitting torque, can be used as a tool for applying the torque acting at the point of application of the drive unit.

[0012] Preferably, the drive element is designed as a plug-in component with a substantially cylindrical base body, wherein the base body has an approximately cylindrical plug-in receptacle for the screw-in component that can be coupled to it. The cylindrical base body gives the drive element comparatively high strength, ensuring that the forces to be transmitted from the drive element's insertion area towards its plug-in receptacle for the screw-in component (to generate the required torque) can be reliably transferred to the respective configuration of positive-locking elements formed on the drive element for transmitting the respective torque. In a separate embodiment of a drive element, the plug-in receptacle for the screw-in component and the insertion area for the tool are arranged at opposite ends of the cylindrical base body, preferably being open. In particular, a screw-in component with its external thread, which interacts with the screw-in component, is located at the end of the cylindrical base body.B. a screw bolt, can then extend completely through the drive part that interacts with the screw part, which preferably has an internal thread.

[0013] In a preferred embodiment of the invention, the positive locking elements on the connecting part are arranged as radially inwardly projecting material ribs on an inner surface that defines the circumferential boundary of the receptacle. These material ribs, projecting particularly on the inner surface of the receptacle of the drive part, enable a structurally simple design of each configuration of positive locking elements on the drive part. Furthermore, the material ribs projecting on the inner surface of the drive part receptacle allow for the simplified creation of different configurations of positive locking elements on multiple drive parts and the associated transmission of varying torques toward the screwing part. In one possible embodiment, the material ribs projecting on the inner surface of two differently designed drive parts, for example, to implement the following:The different torque-defining forms of the positive locking elements have different web widths. In an alternative embodiment, several drive parts have two or four positive locking elements on their inner surface to implement the parameters defining the different torques. These elements are attached to the surface in a way that is particularly free of weakening. Each positive locking element is then uniformly connected to a corresponding minimum number of positive locking elements on the screw part to transmit different torques.

[0014] A preferred embodiment of the invention provides that the screw part comprises a tubular body, on the outer surface of which the positive locking elements are preferably arranged as radially outwardly projecting material webs. By designing a tubular body as part of the screw part, on which the internal thread interacting with the screw part is preferably formed, a component of a screw connection is realized by means of which the torque acting on the tubular body can be reliably converted into a rotational movement of the screw part and a resulting axial movement of the screw part along the screw part.The material ribs, preferably arranged on the outer surface of the tube body and projecting radially outwards, act as positive locking elements, facilitating simple contact with the positive locking elements, which are arranged, in particular, on an inner surface of the plug-in receptacle of the drive part, thus forming a positive locking element pair. Preferably, the positive locking elements on the drive part engage with clearance in the positive locking elements on the screw part located on the outer surface of the tube body, further simplifying the joining of the screw part and the drive part.

[0015] Preferably, several positive locking elements are arranged on each screw part or drive part, which are preferably identical in design or have identical weak points. Preferably, a number of these positive locking elements on both the screw part and the drive part are provided for the joint transmission of the respective torque to be transferred from the drive part to the screw part, since, in principle, a more uniform force transmission to, for example, the pipe body is possible with two or three positive locking elements than with only a single positive locking element. Furthermore, providing several positive locking elements with the same configuration allows for a kind of redundancy of the positive locking elements on the screw or drive part. A positive locking element accidentally triggered during pre-assembly on the plug or screw part then does not immediately render the one-way torque nut designed according to the invention unusable.In particular, the positive locking elements, which are essential for limiting torque transmission on the screw or drive part, preferably have at least two sets of identical positive locking elements, each intended for transmitting one and the same torque.

[0016] In a preferred embodiment of the kit, the positive locking elements on the screw part and / or drive part are arranged at uniform angular intervals around their respective longitudinal axes. Preferably, four, six, or more such positive locking elements are arranged on the screw part or drive part. Arranging the positive locking elements at uniform angular intervals around the longitudinal axes of the screw or drive part simplifies contact between the positive locking elements. In a preferred embodiment, the number of positive locking elements on the respective screw or drive parts varies, with their relative configurations of positive locking elements varying to accommodate different torque values ​​through the various possible pairings of positive locking elements.

[0017] According to a preferred embodiment, the positive locking elements on the multiple screw parts and / or drive parts, with their relative differing configurations of positive locking elements, can optionally have cross-sections of varying sizes, either in addition to or instead of the varying number of positive locking elements. These cross-sections transmit the forces to be transmitted towards the screw part to generate the required torque. In particular, the material webs projecting radially inwards or outwards from the drive or screw part allow for simple and, above all, individual adjustment of the magnitude of the torque to be transmitted towards the screw part. In the simplest form, the width or height of the positive locking elements projecting radially inwards or outwards from the screw part and / or drive part varies. In one possible embodiment, the positive locking elements themselves form the positive locking elements on the screw part or drive part.The drive component has weak points designed to limit the torque that can be transmitted.

[0018] According to a preferred embodiment of the kit according to the invention, the weakening points are formed along a section of the positive locking elements, which preferably project perpendicularly from the screw part and / or drive part. Preferably, the positive locking elements, or in particular a connection area that connects a positive locking element to the screw part or drive part, have at least one weakening point, which defines how much torque can be transmitted towards the screw part until the failure of a respective pair of positive locking elements. Particularly when manufacturing multiple screw parts or multiple drive parts that have different configurations of positive locking elements relative to each other, differently shaped weakening points can be easily created on the respective component sections of the screw or drive part.

[0019] A further development of the present invention provides that the weakening points are designed as predetermined separation points or predetermined bending points. By means of the weakening points designed as predetermined separation points, a controlled separation of the positive locking elements occurs along a respective predetermined separation point when the maximum permissible torque between the drive part and the screw part is reached. Alternatively, by means of the weakening points designed as predetermined bending points, a controlled deformability of a section of the positive locking element is achieved, particularly along a segment extending radially inwards or outwards. This deformability is elastic or plastic and therefore irreversible.Especially when the maximum permissible torque is reached, the positive locking elements, which are preferably dimensionally stable on the other component of the one-way torque nut, slide off the positive locking elements equipped with the predetermined bending points, whereby a user, when tightening the screw connection, perceives the reaching of the maximum permissible torque with the separation of the positive locking elements or the sliding of the dimensionally stable positive locking elements on the deformable positive locking elements as a jerky change in the orientation of the drive part, similar to a torque wrench, relative to the screw part.

[0020] Preferably, markings are provided on the multiple screw components or drive components with their relatively different configurations of positive locking elements to indicate the maximum torques achievable with each screw component or drive component. These markings, particularly those provided on the outside of the respective screw component or drive component, ensure that the user can easily perceive the maximum torque achievable with that component. This advantageously minimizes the risk of incorrect operation and thus the application of potentially excessive or insufficient torque to the respective screw connection. Preferably, each marking displays at least one numerical value to indicate the maximum transmissible torque, for example, 3 Nm, 5 Nm, or any other desired numerical value.

[0021] Preferably, the engagement area on the drive element is located at an end opposite the receptacle for the screw element, or, on a multi-drive element with its two drive elements, the engagement area for the tool is positioned approximately midway between the preferably end-arranged drive elements. A tool engagement area located at an end opposite the receptacle for the screw element allows for simple coupling of a tool to the drive element and generation of the required torque. On a multi-drive element that has a separate drive element at each of its two opposite ends, each with a configuration of positive-locking elements that differ relative to the other, the engagement area is located approximately midway between the ends designed as receptacles for the screw element.In its simplest form, the contact area is preferably designed as a wrench size, in particular as a hexagon, which further simplifies operation with a correspondingly suitable tool that can be brought into contact with it.

[0022] According to a preferred embodiment, the screw part and the drive part each have corresponding locking elements which, by coupling the drive part to the screw part, are configured to form a non-releasable locking connection. In particular, to counteract incorrect operation by a user, especially setting the torque on the one-way torque nut according to the invention to be too low or too high, a non-releasable locking connection between the screw part and the drive part is provided in one possible embodiment. Presetting the torque to be transmitted by means of the one-way torque nut can be carried out, in particular, during the pre-assembly of such a torque nut at the factory.In a preferred embodiment, the locking connection between the screw part and the drive part is realized by means of locking elements formed circumferentially on the components, which preferably lock together in a form-fitting manner when the drive part is coupled to the screw part.

[0023] In a preferred embodiment, the screw part used to form the torque nut according to the invention and the drive part have locking elements that can be engaged with each other for releasing the screw part of the torque-limited screw connection. Preferably, the locking elements on the screw part and drive part are designed as axially interlocking teeth. With the aid of these preferably axially interlocking teeth, it is possible to release an already formed screw connection at any time if necessary. The locking elements of the interlocking teeth on the screw and plug parts are designed, in particular, to slide past each other when the screw connection is tightened and to automatically engage positively when the screw connection is loosened. When the screw connection is tightened, only the positive-locking elements provided for this purpose on the screw part and drive part move into a torque-transmitting position.According to one embodiment of the invention, when the screw connection is loosened, all locking elements forming the toothing on the screw part and plug part interact uniformly.

[0024] According to a preferred embodiment, the detent elements on the screw part are formed at least partially along a coupling section on the screw part and / or the detent elements on the drive part are formed at least partially along a recess extending the receptacle on the drive part. The design of the detent elements on the coupling section of the screw part and the detent elements in the recess on the drive part results in a structurally simple implementation of the toothing on the torque nut according to the invention, which can be engaged by means of the detent elements. The detent elements on the screw part extend, in particular, towards the free end that is received by the receptacle on the drive part. The detent elements forming the toothing on the drive part extend, in particular, towards the free end that defines the receptacle for the screw part.

[0025] The invention is described in more detail below with reference to a preferred embodiment and the accompanying figures. These figures show: Fig. 1: a perspective view of a disposable torque nut according to the invention as part of a kit according to the invention; Fig. 2 and Fig. 3: Perspective views of the torque nut after Fig. 1 forming screw part and drive part, and Fig. 4 A perspective view of another drive part with a configuration of positive locking elements that is relative to the configuration of positive locking elements of the drive part in Fig. 3 different, as a further part of a kit according to the invention for providing a disposable torque nut.

[0026] In Fig. Figure 1 shows a multi-part, one-way torque nut 10' of a kit 10 for a torque-limited screw connection. The torque nut 10' comprises a screw part 12 having a threaded section 14, in particular an internal threaded section. The screw part 12 is designed to interact with a screw part (not shown in detail) which has an external threaded section complementary to the threaded section 14 on the screw part 12. The torque nut 10' further comprises a drive part 16 with a receptacle 18 for torque-transmitting coupling with a coupling section 20 on the screw part 12. The drive part 16 has a contact area 22 for a tool that applies torque. In the embodiment shown, the contact area 22 is a hexagonal profile 24 with a predetermined wrench size SW.

[0027] The screw part 12 and the drive part 16 each have a configuration K1, K2 of positive locking elements 26, 28, which are configured by coupling the drive part 16 with the screw part 12 to form a positive locking element pairing and to transmit the torque applied to the torque nut 10'. In addition to the in Fig. The drive component 16 shown in the kit 10 includes a Fig. Figure 4 shows the drive part 16', which has a configuration K2' of positive locking elements 28' that differs from the configuration K2 of positive locking elements of the drive part 16. Specifically, the positive locking element pairings that can be formed from configurations K1, K2, K2' differ in how much torque can be transmitted before failure of a respective positive locking element pairing.

[0028] In an alternative embodiment of the kit 10 according to the invention for providing a one-way torque nut 10', instead of several drive parts 16, 16' with relatively different configurations K2, K2' of positive locking elements 28, 28', several screw parts with relatively different configurations of positive locking elements 28, 28' can also be provided, with which, for example, only a single drive part 16 with its configuration K2 of positive locking elements 28 is engaged.

[0029] In the embodiment shown here, the configurations K2, K2' of the positive locking elements 28, 28' on the drive parts 16, 16' are provided to differ in one, several, or all of the following parameters: the number of positive locking elements 28, 28', the shape of the positive locking elements 28, 28', and a possible design of weakening points 34 on the positive locking elements 28, 28'. This ensures that a torque-transmitting coupling of the components in the Fig. 3 and Fig. 4 drive parts 16, 16' shown in detail with one and the same in Fig. 2. Screw part 12 shown in detail fails or is lifted at different torques.

[0030] The screw part 12 and the drive part 16 each have a longitudinal axis L which, in the operative connection of the screw part 12 and the respective plug part 16, 16', run essentially coaxially with each other, i.e. in the joined state of the one-way torque nut 10'.

[0031] Fig. Figure 2 shows a close-up view of the screw part 12. Fig. 1. The screw part 12 has a tubular body 30 with a lateral surface 30' on which the positive locking elements 26 are arranged in the form of material webs 32 projecting radially outwards. As further shown from Fig. As can be seen in Figure 2, several positive locking elements 26 are arranged on the screw part 12, which in this case are identically formed on the outer surface 30' of the screw part 12.

[0032] In the embodiment shown here, the positive locking elements 26 are arranged on the screw part 12 at a uniform angular distance a around its respective longitudinal axis L. In one embodiment, the positive locking elements 26 have weakening points 34, which are formed along a section of the positive locking elements 26, which preferably project perpendicularly from the screw part 12.

[0033] In the embodiment shown here, the weakening points 34 are designed as predetermined separation points 34', which are configured so that the positive locking elements 26 are separated along the predetermined separation points 34' at the screw part 12 when a maximum permissible torque is reached. In the embodiment shown here, the weakening points 34 are formed, in particular, directly in the connection area of ​​the positive locking elements 26 with the cylindrical surface 30' of the screw part 12. In an alternative embodiment, the weakening points 34 can also be designed as predetermined bending points, which are not shown in detail.

[0034] The Fig. 3 and Fig. Figure 4 shows two drive parts 16, 16' with relatively different configurations K2, K2' of positive locking elements 28, 28', wherein the drive parts are each designed as separate components. In one possible embodiment, the two drive parts 16, 16' can be arranged at opposite ends of a multi-drive part (not shown in detail).

[0035] The drive parts 16, 16' with their configurations K2, K2' of positive locking elements are each designed as plug-in parts with a substantially cylindrical base body 36. The base body 36 comprises the preferably cylindrical plug-in receptacle 18 for the screw part 12. The positive locking elements 28, 28' are each arranged on the drive parts 16, 16' on an inner cylindrical surface 38 that circumferentially delimits the receptacle 18, as material webs 40 projecting radially inwards from it.

[0036] The two drive parts 16, 16' differ in particular in the number of positive locking elements 28, 28' formed in the receptacle 18, which, together with the configuration K1 of positive locking elements 26 provided on the screw part 12, form a positive locking element pairing by means of which different torques are transmitted until the positive locking element pairing fails. The in Fig. The drive part 16' shown, with its four positive locking elements 28', can generate, together with the screw part 12, a torque twice as large as that generated by the positive locking element pairing of the screw part 12 and the drive part 16. As further shown from Fig. 3 and Fig. As can be seen in Figure 4, the attachment area 22 on the drive part 16, 16' is formed at an end 42 facing away from the receptacle 18 for the screw part 12.

[0037] Instead of the embodiment shown here with a screw part 12 and two differently designed drive parts 16, 16', in one embodiment of the invention two differently designed screw parts and a single drive part that can be combined with the screw parts can also be used. In order to generate different torques with one and the same drive part on the differently designed screw parts, the differently designed screw parts can have positive locking elements with different cross-sections or differently designed weak points connecting the positive locking elements, in particular to the outer surface 30' of the tube body 30 on the screw part.

[0038] In an embodiment of the invention not shown in detail, the screw part 12 and the drive parts 16, 16' each have corresponding locking parts which are arranged with couplings of the drive part 16, 16' on the screw part 12 to form a non-releasable locking connection between the screw part 12 and a respective drive part 16, 16'.

[0039] As from the Fig. 2, Fig. 3 to Fig.As can be further seen from Figure 4, the screw part 12 and the drive parts 16, 16' have locking elements 44, 44' that can be engaged with each other for loosening the screw part 12 of the torque-limited screw connection. The locking elements 44, 44' on the screw part 12 and the drive parts 16, 16' form an axially interlocking toothing 46. In particular, the locking elements 44, 44' on the screw part 12 and the drive parts 16, 16' are designed to slide past each other when the screw connection is tightened. In the present case, the locking elements 44 on the screw part 12 are formed at least partially along the outer surface 30' of the tube body 30 and / or the locking elements 44' on the drive parts 16, 16' are formed at least partially along a recess 48 extending the receptacle 18 on the drive parts 16, 16'. Reference symbol list: 10 Kit 10' Torque nut 12 screw part 14 Thread section 16, 16' drive unit 18 recording 20 Coupling section 22 Starting area 24 Hexagonal profile 26 Positive locking element 28, 28' Positive locking element 30 pipe bodies 30' surface area 32 Material bridge 34 weak points 34' Designated separation points 36 basic shapes 38 Surface area 40 Material bridge 42 End 44, 44' Locking element 46 gear teeth 48 Exclusion L Longitudinal axis K1 configuration K2, K2' configuration SW wrench size a angular distance

Claims

[1] Kit (10) for providing a one-way torque nut (10') for a bolted connection, wherein the torque nut (10') is formed by - a screw part (12) having a threaded section (14), and - a drive part (16, 16') that can be coupled to the screw part (12) to transmit torque, wherein the drive part (16, 16') has an attachment area (22) for a torque-applying tool, wherein the screw part (12) and the drive part (16, 16') each have a configuration (K1, K2, K2') of positive locking elements (26, 28, 28') which are configured to form a positive locking element pairing in the coupled state of screw part (12) and drive part (16, 16') and to transmit the torque applied to the nut (10'), and wherein the kit comprises several screw parts (12) with relatively different configurations (K1) of positive locking elements (26), and / or several drive parts (16, 16') with relatively different configurations (K2, K2') of positive locking elements (28, 28'), wherein the positive locking element pairings that can be formed from the configurations (K1, K2, K2') differ in how much torque can be transmitted until the positive locking element pairing fails. [2] Kit according to claim 1, comprising multiple screw parts (12), wherein the configurations (K1) of the positive locking elements (26) on the screw parts (12) differ in one, several or all of the following parameters: - Number of positive locking elements (26), - Shape of the positive locking elements (26), and - in the formation of weak points (34) on the positive locking elements (26). [3] Kit according to claim 1 or 2, comprising multiple drive parts (16, 16') wherein the configurations (K2, K2') of the positive locking elements (28, 28') on the drive parts (16, 16') differ in one, several or all of the following parameters: - Number of positive locking elements (28, 28'), - Shape of the positive locking elements (28, 28'), and - in the formation of weak points on the positive locking elements (28, 28'). [4] Kit according to any one of claims 1 to 3, characterized by , that the drive part (16, 16') and the screw part (12) each have a longitudinal axis (L) which are essentially coaxial to each other in the operative connection of drive part (16, 16') and screw part (12). [5] Kit according to any of the preceding claims, characterized by, that several drive parts (16, 16') with relatively different configurations (K2, K2') of positive locking elements (28, 28') are arranged at opposite ends of a multi-drive part (16, 16'). [6] Kit according to any of the preceding claims, characterized by , that the drive part (16, 16') is designed as a plug-in part with a substantially cylindrical base body (36), wherein the base body (36) has an approximately cylindrical plug-in receptacle (18) for the screw part (12). [7] Kit according to any of the preceding claims, characterized by , that the form-locking elements (28, 28') are arranged on an inner surface (38) that limits the receiving (18) in the circumferential direction as material webs (40) projecting radially inwards. [8] Kit according to any of the preceding claims, characterized by, that the screw part (12) has a tube body (30) on the outer surface (30') of which the positive locking elements (26) are preferably arranged as material webs (32) projecting radially outwards, [9] Kit according to any of the preceding claims, characterized by , that on each screw part (12) or each drive part (16, 16') several positive locking elements (26, 28, 28') are arranged which are preferably identical in design or have identically designed weak points (34). [10] Kit according to any of the preceding claims, characterized by , that the positive locking elements (26) on the screw part (12) and / or drive part (16, 16') are arranged at a uniform angular distance (a) around its respective longitudinal axis (L). [11] Kit according to any of the preceding claims, characterized by, that the positive locking elements (26, 28, 28') of the different configurations (K1, K2, K2') of positive locking elements (26, 28, 28') have different cross-sectional sizes. [12] Kit according to any of the preceding claims, characterized by , that the weakening points (34) are formed along a section of the positive locking elements (26, 28, 28') which preferably project perpendicularly to the screw part (12) and / or drive part (16, 16'), wherein the weakening points (34) are preferably formed as predetermined separation points (34') or predetermined bending points. [13] Kit according to any of the preceding claims, characterized by , that markings are provided on the several screw parts (12) or drive parts (16, 16') with their relative different configurations (K1, K2, K2') of positive locking elements (26, 28, 28') to indicate the maximum torques achievable with the screw parts (12) or drive parts (16, 16'). [14] Kit according to any of the preceding claims, characterized by , that the contact area on the drive part (16, 16') is formed at an end (42) facing away from the receptacle for the screw part (12), or that on the multi-drive part with two drive parts (16, 16') the contact area (22) for the tool is formed approximately centrally in the axial direction between the preferably end-arranged drive parts (16, 16'). [15] Kit according to any of the preceding claims, characterized by , that the screw part (12) and the drive part (16, 16') each have corresponding locking parts which are arranged with couplings of the drive part (16, 16') on the screw part (12) to form a non-releasable locking connection. [16] Kit according to any of the preceding claims, characterized by, that the screw part (12) and the drive part (16, 16') have locking elements (44, 44') that can be brought into engagement with each other for releasing the screw part (12) of the torque-limited screw connection, wherein preferably the locking elements (44, 44') on the screw part (12) and drive part (16, 16') are designed as an axially interlocking toothing (46). [17] Kit according to claim 16, characterized by , that the locking elements (44) on the screw part (12) are formed at least partially along the cylindrical surface (30') and / or the locking elements (44') on the drive part (16, 16') are formed at least partially along a recess (48) extending the receptacle (18) on the drive part (16, 16').

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