A fastener for a transmission part includes a main body. The main body has at least one external screw thread and at least one through-hole. The fastener further includes a first pin displaceable in a first region of the through-hole and a second pin having an external screw thread. A second region of the through-hole has at least one internal screw thread configured to be screwed to the external screw thread of the second pin. The second pin has a through-hole. The first pin has an internal screw thread aligned with the through-hole of the second pin.

A mounting tool includes a base component and an attachment means. The base component includes a mounting portion defining an attachment location for receiving and securing a repair tool so as to maintain the repair tool at a desired repair location and a first receiving portion defining a first cavity for receiving a portion of a wind turbine so as to be externally secured to the wind turbine. The attachment means may be adjustably secured to the first receiving portion of the base component and securable to the portion of the wind turbine so as to secure the mounting tool to the wind turbine at the desirable repair location.

A fluid end having its fluid flow bores sealed without threading a retaining nut into the walls of each bore. The fluid ends may be assembled using a plurality of different kits, each kit comprising a fluid end body, a component, a retainer element, and a fastening system. The retainer element holds the component within each of the bores formed in the fluid end body and the fastening system secures the retainer element to the body. The fastening system comprises a plurality of externally threaded studs, washers and nuts in some embodiments. In other embodiments, the fastening system comprises a plurality of screws.

A rotor blade for a rotor of a wind power installation, to a rotor for a wind power installation, to a wind power installation having a rotor blade and/or having a rotor, and to a method for connection of a rotor blade at a hub of a rotor of a wind power installation. The rotor blade comprises a hub-side end for fastening the rotor blade to a movable part of a blade bearing, wherein a bearing cover is arranged on an outer circumferential surface of the hub-side end of the rotor blade, wherein a portion of the bearing cover that is close to the bearing is further away from the outer circumferential surface of the hub-side end of the rotor blade than a portion of the bearing cover that is remote from the bearing by a multiple.

A steel tower ring segment for a wind turbine tower section, to a wind turbine tower section, to a wind turbine tower and to a wind turbine, and also to methods for producing a steel tower ring segment and a wind turbine tower section. A steel tower ring segment for a wind turbine tower section, comprising a first casing segment with a segment height, a segment length in the segment circumferential direction, a first segment thickness, and a first horizontal joint side, wherein the first casing segment has a first thickening region in a region adjoining the first horizontal joint side, wherein the first thickening region has a first thickening thickness, and the first thickening thickness is larger than the first segment thickness, wherein the first thickening region has a first cutout, wherein the first cutout is arranged spaced apart from the first horizontal joint side, and wherein a first passage opening leads from the first cutout to the first horizontal joint side.

A flange connection system, including a pair of flange rings each including a neck portion and a radially extending flange portion. The radially extending flange portion includes a distal face including a contact surface that protrudes from a remainder of the distal face. The radially extending flange portion includes a plurality of circumferentially spaced bolt holes extending parallel to a center axis. The distal face including a first seal pocket radially inward of the contact surface and a second seal pocket radially outward of the contact surface, wherein in an assembled condition, the contact surface of the first flange ring is disposed against the contact surface of the second flange ring, a first seal ring is disposed in the first seal pockets, and a second seal ring is disposed in the second seal pockets.

An assembly includes a first block including a first end; and a second block assembled with the first block at a same height as the first block, the second block including a second end facing the first end of the first block. The first block and the second block are connected to the assembly such that there is no structural connection between the second end of the second block facing the first end of the first block.

A wind or tidal turbine blade having an attachment, the attachment including: a support portion of the turbine blade, the support portion having opposite surfaces; an insert adapted to mount a bolt for attaching the support portion to another structure; and a mounting for fitting the insert to the support portion, the mounting including a layer extending over a front face of the insert and bonded to the opposite surfaces of the support portion on opposite sides of the insert, the layer permitting passage of a bolt therethrough to or from the insert.

A fluid end having its fluid flow bores sealed without threading a retaining nut into the walls of each bore. The fluid ends may be assembled using a plurality of different kits that each comprise a fluid end body, a component, a retainer element, and a fastening system. The retainer element holds the component within each of the bores formed in the fluid end body and the fastening system secures the retainer element to the body. The fastening system comprises a plurality of externally threaded studs, washers and nuts in some embodiments. In other embodiments, the fastening system comprises a plurality of screws.

A bolted attachment having opposite threaded sections between which a shank is provided having at least two shank sections with different diameter located at a length from the threaded section of at least three times the difference between a diameter of a threaded section and a minimum diameter of the shank. At least one conical transition is formed between two adjacent shank sections where the ratio of its length to a difference between a diameter at one end of the transition and a diameter at the opposite end of the transition is of at least 0.85.