Abstract: A washer or spacer has a base with a central opening and a plurality of studs or teeth that surround the central opening. The teeth are transverse or perpendicular in relation to the base. The teeth adjacent an outer perimeter of the base are longer than the teeth adjacent the central opening.

Abstract: A dual-threaded screw structure having two kinds of threads formed on a shank, namely, a first thread consisting of one or more threads and a second thread having a lead larger than a lead of the first thread is provided herein. The claimed configuration has a beneficial effect of preventing looseness when the screw structure is fastened with double nuts. One embodiment of the present invention exhibits an example of a dual-threaded screw structure, in which a root diameter between the ridges of the hill-like second thread ridges is formed to be larger by 10% of a height of the ridges than an effective diameter of a first thread. In this case, an inner diameter of an internal thread of a second nut for preventing looseness is formed to be larger than the effective diameter of the first thread by 10% of the height of the ridges.

Abstract: A fastening member includes a screw thread formed therein. A portion including a crest portion of the screw thread is formed of a first alloy material and includes: a thick portion where the portion is maximized in thickness in a circumferential direction; and a thin portion where the portion is minimized in thickness in the circumferential direction. A portion including a root of the screw thread is formed of a second alloy material having a tensile strength higher than that of the first alloy material.

Abstract: A device for torque limiting is provided, including a holding element for a nut or a screw head, the holding element including a top part having an entrainment profile in a rear area of the holding element for the rotatably fixed coupling of the top part with a setting tool, and the holding element including a receiving part having a receptacle in a front area of the holding element for rotatably fixedly accommodating the nut or the screw head. According to the invention, the holding element includes three torque-transmitting webs, which connect the receiving part and the top part and which form a predetermined breaking point. The invention also relates to a fastening arrangement made up of a device of this type and an expansion anchor.

Abstract: A device for torque limiting, which includes a nut and a holding element including a top part having an entrainment profile in a rear area for the rotatably fixed coupling of the top part with a setting tool. A receiving part has a receptacle in a front area of the holding element, in which the nut is rotatably fixedly accommodated. A device for torque transmission from the top part to the receiving part connects the top part and the receiving part and breaks at a limiting torque, interrupting the connection between the top part and the receiving part. The holding element includes at least one holding claw situated on the receiving part and securing the nut in the receptacle on the front side of the nut. A fastening arrangement made up of an expansion anchor and a device of this type for torque limiting as well as a method for manufacturing a device of this type.

Abstract: A fastening structure inserts a threaded rod 11a of a bolt 11 through a fixing hole 12a of a to-be-fixed member 12 in a manner such that an end portion of the threaded rod protrudes from the fixing hole, and screwing a machine screw 15 with a proper torque into a nut 14 which is provided on the end portion via a washer 13. The washer has an inclined surface 13c formed on a first side 13b which faces the nut, and has a flat surface formed on a second side 13d. The machine screw is screwed into the nut in a direction such that an axis is orthogonal to the inclined surface 13c. The first side (the inclined surface) and the second side of the washer have a different surface roughness, and the first side has a smaller coefficient of friction than the second side.

Abstract: A self-tapping compression limiter for a structure of an automotive vehicle. The limiter includes a body having a first end extending to a second end. The body has a bore formed through the first and second ends defining a longitudinal axis. The body has an outer wall having a shoulder radially extending from the outer wall and formed adjacent one of the first and second ends to reduce tolerance to the structure. The outer wall has a threaded portion formed about the longitudinal axis. The threaded portion is matingly cooperable with the structure to provide a positive lock interface between the limiter and the structure.

Abstract: The present invention relates to a screw element (1) comprising a threaded shaft (2), a screw tip (4) formed on one shaft end and a screw head (5), formed on an opposite shaft end and with force application means (7), and comprising a screw thread (12) extending on the threaded shaft (2) and on the screw tip (4), wherein the screw tip (4) has a front tip section (4a) tapering toward the screw element end, when viewed in the screwing-in direction (Z), and a section (4b) formed on the threaded shaft with a polygonal cross section, when viewed in cross section, whose enveloping circle diameter (dh) is greater than a core diameter (dk) of the screw tip (4), and the polygonal cross section has a corner point (15) lying on the enveloping circle of the section (4b), and a front edge surface (9), radially oriented with respect to a longitudinal center axis (X-X), ends in said corner point in the sense of an increased diameter.

Abstract: A fastener retainer may include a surface, a hook integrated into the surface, and a fastener hole defined in the surface below the hook. A substrate may include a hook extending out of and integrated into a first side of the substrate, a screw hole defined through the substrate, and a countersink formed at least equal to the height of the hook on the first side of the substrate.

Abstract: A nut plate assembly includes a base plate having base plate openings. The nut plate assembly includes channel fittings coupled to the bottom of the base plate each having a main body with a top facing the bottom of the base plate. Each channel fitting has a nut cap channel at the bottom of the main body aligned with the opening in the main body. The nut plate assembly includes nut caps received in the nut cap channels coupled to the channel fittings and positioned below the bottom of the main body. Each nut cap has a pocket holding a nut to receive a fastener used to secure the base plate to the mounting structure from an exterior surface of the mounting structure through the base plate and the main body of the channel fitting.

Abstract: The present disclosure provides an anti-loosening screw pair and an anti-loosening screw component. The screw pair includes a first screw component provided with a first screw thread and a second screw component whose outer wall surface is provided with a second screw thread. The first and second screw components are in threaded connection. In a direction of the first screw component being screwed into the second screw component, sides of the first and second screw threads pressing against each other are formed into force-bearing fitting faces respectively, and opposite sides thereof are formed into non-force-bearing fitting regions respectively. At least one of the force-bearing fitting faces and the non-force-bearing fitting regions of the first and the second screw components is provided with a stopper so as to prevent radial displacement between the first and the second screw components.

Abstract: A device for torque limiting, has a nut having a female thread. A holding element includes a top part having an entrainment profile in a rear area of the holding element for the rotatably fixed coupling of the top part with a setting tool and a receiving part having a receptacle in a front area of the holding element, in which the nut is rotatably fixedly accommodated, the top part having a passage, through which a threaded rod screwed into the nut may be led out of the holding element through the top part along the longitudinal axis of the device. The holding element includes a web connecting the receiving part and the top part and which forms a predetermined breaking point. In at least one longitudinal sectional plane of the device, the smallest wall thickness of the at least one web is present on a line segment of minimum wall thickness, which runs at an angle greater than 45° with respect to the longitudinal axis of the device. A fastening arrangement includes the device.

Abstract: A pin lock fastener comprises a fastener component (e.g., bolt or nut) having an aperture formed through an outer surface of the fastener component, and a pin supported by the fastener component and slidable through the aperture. The pin can comprise a locking end portion to interface/lock with a pin lock feature of a fastener receiver structure. The pin lock fastener can comprise an actuator cap rotatably coupled to the fastener component, and a torsion spring can have a first end coupled to the fastener component and a second end coupled to the actuator cap. The pin can be secured to the torsion spring that applies a biasing force to the pin in a normal locked position to restrict rotation of the fastener component relative to the fastener receiver structure secured to the fastener component. The pin lock fastener can be repeatedly used. Associated fastened assemblies and methods are provided.

Abstract: The present disclosure relates to a fastener system for use in securing objects, such as stress skinned panels, to a structural support, such as an aircraft spar or cross member. The fastener may be provided with a radially-expandable collar assembly, an anti-rotator assembly, a shaft, and a bolt-lock.

Abstract: A fastener assembly (100) includes a securing panel (102) and a fixation member (104) that projects away from the securing panel along a center axis (101). The fixation member includes opposing arms (106, 108) that are angled toward the center axis and opposite ribs (118, 120) disposed between the arms and angled toward the center axis. The fixation member is inserted through openings in first and second components. The arms engage the first component and the securing panel engages the second while the fastener assembly is in a locked state to secure the first and second components together. The fixation member is partially rotated around the center axis to transition the fixation member to an unlocked state. The ribs are brought into contact with an edge of the first component and the arms are moved out of contact with the first component while the fastener assembly is in the unlocked state to decouple the components from each other.

Abstract: A lock tight nut and bolt system resistant to loosening due to vibration. The lock tight nut and bolt system includes an upper nut that has a shank part. The upper nut has first threads that are off center from a center of a bolt. The upper nut is configured to receive the bolt. A lower nut has a socket part and second threads that are centered with the center of the bolt. The socket part corresponds with the shank park of the upper nut. The upper nut and the lower nut are concentric with the center of the bolt. The system further may include the bolt.

Abstract: A containment apparatus for enclosing a metallic fastener extending through a structure includes a cap member. The cap member includes a first wall member which defines a first cavity and a first end. The first end defines a first opening providing access into the first cavity for at least a portion of the metallic fastener. The cap member further includes a second wall member secured to and extends from an exterior surface of the first wall member. The second wall member extends spaced apart from and along the first wall member to a first end. The second wall member surrounds the first wall member such that first wall member and second wall member form a second cavity positioned between the first wall member and the second wall member. The first end of the first wall member and the first end of the second wall member are coplanar with one another.

Abstract: The invention relates to a screw for cutting a thread into a component, having a shank which at least in portions is provided with a thread, a screw head having a drive configuration, the latter being adjoined by the shank, wherein, proceeding from an end of the shank that is opposite the head, first a cutting portion and then a holding portion are disposed, wherein the cutting portion and the holding portion are provided with a thread, wherein the holding portion has a larger external diameter in relation to the cutting portion, characterized in that a truncated-cone-type intermediate portion that is provided with a thread is disposed between the holding portion and the cutting portion, and in that the cutting portion has a truncated-cone-type attachment portion.

Abstract: A sealing wedge-lock washer assembly usable in a hygienic, secure fastening system. A wedge-lock washer assembly comprises two wedge-lock components—one of which is a sealing wedge-lock washer having a wedge-lock cam and a sealing material bonded to its outer rim. The other component is a standard wedge-lock washer or a bolt whose head has a wedge-lock cam that engages the complementary cam on the sealing wedge-lock washer. The resulting sealing wedge-lock washer assembly locks a bolt in a secure joint that is hygienically sealed from the intrusion of contaminants by the sealing material.

Abstract: To provide a retainer having excellent moldability and durability while having a predetermined pull-out load and predetermined rotational torque. The retainer includes a nut main body 10 having a female thread 11, longitudinal ribs 13 formed between a plurality of recessed portions 12 and 12 provided along an outer circumferential surface of the nut main body 10, transverse ribs 14 formed between a plurality of recessed portions 12 and 12 provided on the outer circumferential surface of the nut main body 10 along an axial center direction, and the longitudinal ribs 13 and the transverse ribs 14 are connected to each other. Then, the longitudinal ribs 13 and the transverse ribs 14 form a frame structure.