An acousto-optic device may include an acousto-optic component carried by a chassis, and a fastener assembly for removably securing a cover to the chassis. The fastener assembly may include a base sleeve having an enlarged head, and a tubular body and extending through a cover passageway. The fastener assembly may include a retainer sleeve having a threaded interior secured to the threaded exterior of the base sleeve to define an anchor member, the anchor member having a threaded interior. The fastener assembly may further include a fastener, a shaft having a threaded exterior opposite the enlarged head and to be threaded through the threaded interior of the anchor member to capture the fastener to the cover and movable through the chassis passageway for removably securing the cover to the chassis.

A fastener assembly for securing at least two materials together with a screw having an externally threaded shank and an enlarged head, and a nut having a shank with a blind hole therein. The blind hole being internally threaded to threadingly receive the externally threaded shank of the screw. The nut having an enlarged head on an end of the shank opposite from an end with an opening of the blind hole. The enlarged head of the nut having an outer surface and an inner surface. A sealing member may be disposed around the shank of the nut. The shank of the nut extends out of and away from the inner surface of the enlarged head of the nut, and the inner surface may include a depression surrounding the shank. The nut has a plated outer surface.

A blind fastener may include a bolt. The bolt includes a head, a shank coupled to the head, and a number of external threads formed on the shank. The blind fastener may also include a mount coupled to the bolt, and a fastening block coupled to the mount. The mount may include a body, at least one arm extending from the body, and at least one pivot mount formed on and extending from the arm about which the fastening block pivots.

An axial preloading device can include a shell having an inner surface that defines a radially interior channel, the inner channel defining an axial direction, one or more moveable housing members disposed at least partially within the interior channel and configured to move relative to the shell in the axial direction, and a wedge assembly connected to the shell and disposed in contact with the one or more housing members. The wedge assembly can be configured to be moved radially relative to the shell and the one or more housing members to push the one or more housing members axially. The wedge assembly and the one or more housing members define a shaft opening when installed on the shell.

An enclosure for protecting electrical components, cables and the like. The enclosure has a plurality of faces which define a volume with an opening to provide access. One face has apertures for receiving fixing screws to fix the enclosure to a wall or surface. There is a lid to close the opening. Spacer members separate the enclosure from the surface. Each has a bore extending through it and a threaded portion extending from a surface of the face which engages the apertured face of the enclosure. For each spacer there is a cap for covering the aperture and sealing the apertured face. Also provided for each spacer is a retainer for threading onto the externally threaded portions when the spacer's threaded portion extend through the apertured face.

A composite stand stud includes a body portion, a screw and a tubular member. The body portion includes a support platform, a support body, and a connecting portion. A diameter of the support platform is larger than a diameter of the support body, and two ends of the support body are respectively connected to the support platform and the connecting portion. A diameter of the screw is smaller than a diameter of the support body, and one end of the screw is defined as an embedded end disposed in the connecting portion of the body portion, and the other end thereof is defined as a penetrating end penetrating from a center of the support platform to an outside of the body portion. The screw and the support platform are perpendicular to each other. The tubular member is wrapped around an outer edge of the support body.

A method of protecting an air vehicle against lightning strikes includes inserting a fastener through a hole in conjoined structures, the fastener defining an axis along its length and having a threaded end and a sleeve, and installing a washer assembly over the threaded end and the sleeve, the washer assembly having a metallic washer and a polymer seal radially inward of the metallic washer. The seal includes a lower seal portion defining a counter-bore, and an upper seal portion extending axially from the lower seal portion. The method includes installing a counter-bored nut on the threaded end, and applying torque to the nut to compress the lower seal portion against a surface of the conjoined structures and around the sleeve at the counter-bore of the seal, and to compress the upper seal portion of the seal into a counter-bore of the nut and around the threaded end.

A frame includes a plurality of profile sections and at least one first adapter assembly. Each profile section includes at least one section extension surface, and one of the at least one section extension surface is provided with at least one first groove therein. Each first adapter assembly includes a first position-limiting block provided with at least one first mounting hole therein. The first position-limiting block is configured to be fixed in a first groove during assembly, and to fix other components to the profile section through the at least one first mounting hole.

A multi-plate coupling includes two connecting flanges and an intermediate member arranged between the connecting flanges. A plate pack crown is arranged between each of the connecting flanges and the intermediate member. The plate pack crown is alternately connected to the associated connecting flange and the intermediate member by screw fasteners which are guided through continuous fastening bores arranged in the plate pack crown. At least one of the fastening bores of the plate pack crown has a contour diverging from the circular shape. A positive-locking element having a corresponding outer contour is inserted into the fastening bore. A component bears on the outer contour of the positive-locking element in a positive-locking manner and provides a bending edge for the plate pack crown.

An enclosure for protecting electrical components, cables and the like. The enclosure has a plurality of faces which define a volume with an opening to provide access. One face has apertures for receiving fixing screws to fix the enclosure to a wall or surface. There is a lid to close the opening. Spacer members separate the enclosure from the surface. Each has a bore extending through it and a threaded portion extending from a surface of the face which engages the apertured face of the enclosure. For each spacer there is a cap for covering the aperture and sealing the apertured face. Also provided for each spacer is a connecting member fixed to said aperture each having third and fourth threaded portions for respectively engaging first and second threaded portions.