Abstract: The present disclosure provides a screw and a screw assemblage. The screw includes a screw head and a screw shaft which protrudes from an underside of the screw head and has a self-forming or self-cutting thread, wherein the underside of the screw head has a bearing area and at least one annular recess extending around the shaft between the bearing area and the shaft, wherein a coating made of an elastic sealant is attached to the underside of the screw head.

Abstract: A compensating element having a first and a second assembly, wherein a locking mechanism is provided which can be switched over between a first and a second operating state. In the first operating state, the first assembly is connected fixedly to the second assembly and, in the second operating state, the first and second assemblies are connected to each other via a spring mechanism in such a manner that they are movable relative to each other. The locking mechanism includes an electric motor that can be used to switch over between the first and the second operating state. A locking ring is or is not braced against at least three balls depending on its rotational position with respect to a center axis. The locking ring is connected in terms of rotary drive to the electric motor via a torsion spring which is elastic with respect to the center axis.

Abstract: The device for use in an explosive atmosphere zone has a device housing and at least one energy supply part that is provided with at least one battery or at least one rechargeable battery as well as energy-associated supply contacts. The energy-associated supply contacts interact with device-associated supply contacts when the energy supply part is connected to the device. The energy-associated and device-associated supply contacts have connected upstream thereof switches that, prior to separation of the energy supply part from the device, can be controlled by a circuit such that the switches deenergize the energy-associated and the device-associated supply contacts.

Abstract: The device for use in an explosive atmosphere zone has a device housing and at least one energy supply part that is provided with at least one battery or at least one rechargeable battery as well as energy-associated supply contacts. The energy-associated supply contacts interact with device-associated supply contacts when the energy supply part is connected to the device. The energy-associated and device-associated supply contacts have connected upstream thereof switches that, prior to separation of the energy supply part from the device, can be controlled by a circuit such that the switches deenergize the energy-associated and the device-associated supply contacts.