The disclosure relates to an anchor system having an internally threaded anchor and a bolt or shaft screwed together with said anchor for holding an add-on component in a hole that is pre-drilled into a wall made of concrete or brick work, characterized in that the bolt of shaft comprises a coil spring which is wound suitably to the inner thread of the internally threaded anchor and screwed into said inner thread.

One fastener has a shaft with proximal and distal ends. Threading extends along the shaft from the distal end, and a head is at the proximal end. A channel passes entirely through the shaft such that a first lateral portion of the shaft is on one side of the channel and a second lateral portion of the shaft is on an opposite side of the channel. The channel is inset from the distal end. A hollow area in the shaft extends from the distal end toward the proximal end. The hollow area has a width that is greater than a width of the channel, and a biasing member is positioned inside the hollow area. An insert has an interior portion and an exterior portion. The interior portion is configured for positioning in the channel and the hollow area, and the exterior portion is configured to be located outside the shaft.

A high-strength screw (1) includes a head (2) and a threaded portion (5) including a thread (6) and a thread end (9) facing away from the head (2) in an axial direction. The threaded portion (5) includes an unhardened portion (12) starting at the thread end (9) and extending in an axial direction. The unhardened portion (12) has a hardness being reduced compared to an axial middle portion (11) of the threaded portion (5).

A high-strength screw (1) includes a head (2) and a threaded portion (5) including a thread (6) and a thread end (9) facing away from the head (2) in an axial direction. The threaded portion (5) includes an unhardened portion (12) starting at the thread end (9) and extending in an axial direction. The unhardened portion (12) has a hardness being reduced compared to an axial middle portion (11) of the threaded portion (5).

A plastic component with at least one fastening element attached to the plastic component, wherein the fastening element comprises at least one attachment section for attachment to the plastic component and at least one fastening section for fastening a part to be mounted on the plastic component, wherein the plastic component is composed of a plastic matrix, wherein the attachment section of the fastening element is integrated in a first area of the plastic matrix, and wherein reinforcement fibers are integrated in a second, different area of the plastic matrix, wherein the attachment section of the fastening element comprises at least one form element projecting from a surface of the attachment section, wherein the at least one form element is integrated in the first area of the plastic matrix.

A plastic component with at least one fastening element attached to the plastic component, wherein the fastening element comprises at least one attachment section for attachment to the plastic component and at least one fastening section for fastening a part to be mounted on the plastic component, wherein the plastic component is composed of a plastic matrix, wherein the attachment section of the fastening element is integrated in a first area of the plastic matrix, and wherein reinforcement fibers are integrated in a second, different area of the plastic matrix, wherein the attachment section of the fastening element comprises at least one form element projecting from a surface of the attachment section, wherein the at least one form element is integrated in the first area of the plastic matrix.

An assembly includes a simulated nut-and-washer member and a mounting device. The simulated nut-and-washer member includes a base plate simulating a washer, and a cylindrical portion simulating a nut and having a top surface and an outer sidewall with a plurality of faces, the top surface defining a first circular opening having a first diameter. An inner annular surface is disposed radially inward from the outer sidewall and defines a second circular opening disposed coaxial with the first circular opening and having a diameter that is less than the first diameter. The mounting device is configured to be received through the first and second circular openings, and it has a head portion that is configured to contact the inner annular surface.

An assembly includes a simulated nut-and-washer member and a mounting device. The simulated nut-and-washer member includes a base plate simulating a washer, and a cylindrical portion simulating a nut and having a top surface and an outer sidewall with a plurality of faces, the top surface defining a first circular opening having a first diameter. An inner annular surface is disposed radially inward from the outer sidewall and defines a second circular opening disposed coaxial with the first circular opening and having a diameter that is less than the first diameter. The mounting device is configured to be received through the first and second circular openings, and it has a head portion that is configured to contact the inner annular surface.

Herein a bolt (2) comprising an elongated body (4) with a central axis (C) is described. The elongated body (4) is in a first end (6) provided with a first thread (8) and in a second end (10) with a second thread (12). An intermediate part (14) of the elongated body (4) is provided with a collar (16). The collar (16) is provided with at least one first flat surface (18), which first flat surface (18) extends substantially in parallel with the central axis (C). Further, a rock drill comprising housing parts held together by at least one bolt (2) is described.

Disclosed is a sheet-metal fastener configured to join two components, such as sheet-metal. The sheet-metal fastener comprising a head and a shank. The head may define an undercut region and a serrated region. The serrated region can be positioned at an outer perimeter of the head. The serrated region can be composed of a plurality of knurls. The shank extends perpendicularly from the undercut region and comprises one or more threads.