Abstract: An expandable washer for use with a fastener to maintain tension in the fastener after connection to a component comprises first and second disks. The first and second disks cooperatively define a channel having a dimension parallel to the expansion axis which decreases from a location remote from to a location closer to the expansion axis. The first and second disks are configured to pass the fastener through them and to the component. The fastener operatively engages the first disk for moving with the first disk and to place the fastener in tension when the fastener is connected to the component. The expandable washer further includes a cam located radially outward from the expansion axis and biased for movement toward the expansion axis to drive the first and second disks apart to maintain the application of force against the fastener.

Abstract: A universal hardware nut that may be adaptable for use with various mating fasteners (e.g., bolts and screws). In one embodiment, the universal hardware nut comprises a nut body, wherein the nut body is manufactured from a pliable material; and one or more slots, wherein the one or more slots allow the nut body to accept fasteners of different sizes and shapes. In alternate embodiments, the universal hardware nut may comprise a sized hole instead of the one or more slots, or may comprise a combination of a sized hole and one or more slots.

Abstract: An accessory for tethering a cap for a SMA/SMP bulkhead to a device assembly without having to introduce elements that could compromise the integrity of the device assembly. The accessory includes a first portion that engages the SMA/SMP bulkhead and securely interconnects thereto, and a second portion that includes an opening where a tether chain is physically interconnected thereto. The tether chain includes the cap for the SMA/SMP bulkhead secured to the second end thereof.

Abstract: A fastening system for a metallic cellular shipping container floor includes a potted insert with a body disposed between a top flange at one end and a bottom flange at another end. The body defines a channel from the top flange leading towards the bottom flange and has a depth not exceeding a distance from the top flange to the bottom flange. The system also includes a hole formed in a panel of a metallic cellular shipping container floor with a depth identical to or greater than a distance from a top portion of the top flange to a bottom portion of the bottom flange. Finally, the system includes a self-tapping screw disposed within the channel of the potted insert, and including a threaded shaft with tip at a distal end of the shaft, and a screw head at a proximal end of the shaft.

Abstract: A double eccentric bushing arrangement comprises a first eccentric bushing comprising a first eccentric aperture, a second eccentric bushing comprising a second eccentric aperture, a fastener, a washer configured to be received around a portion of the second eccentric bushing, and a snap ring configured to be received around a portion of the second eccentric bushing to secure the washer in an installed position. The first eccentric bushing is configured to receive the second eccentric bushing in the first eccentric aperture. The second eccentric bushing is configured to receive the fastener in the second eccentric aperture. The first eccentric bushing is rotatable with respect to the second eccentric bushing to adjust a position of the fastener with respect to an adjacent component to which the fastener is being attached.

Abstract: The disclosure relates to handle mechanism and casing assembly. The handle mechanism is adapted to be installed on a slidable plate body. The handle mechanism includes handle component, latch component, and releasing component. The handle component has engaged position. The handle component includes first hook portion and first pushing portion. The first hook portion has first contact surface. The latch component is slidably disposed and has second hook portion and first contact portion. The second hook portion has second contact surface configured to contact the first contact surface. The releasing component is pivotably disposed and has pressed portion and second pushing portion. When the handle component is pivoted from the engaged position, the first pushing portion pushes the pressed portion so as to force the second pushing portion to push the first contact portion so that the second contact surface is forced to leave the first contact surface.

Abstract: A fastening member for joining together adjacent duct sections includes a head and a shank extending from the head, the shank having an unthreaded space adjacent to the head and a threaded portion extending from the unthreaded space, the threaded portion threadedly engaging a hole of an inserted corner plate positioned in flange of a first duct section. When the fastening member is fully inserted, the inserted corner plate positioned in the flange of the first duct section is retained within the unthreaded space.

Abstract: A connector and shielding ring for use with the connector includes a male portion with a shroud and a center conductor and a female portion with a jack and a socket positioned to receive the center conductor. A conductive shielding ring is positioned between the mated connector portions. The shielding ring has a body configured for surrounding flexible tines of the female portion jack and is configured to be captured between the tines and the shroud for providing a grounding path between the male and female portions of the connector. The shielding ring body has an inner surface with a diameter and an outer surface with a diameter and has a taper portion formed on a distal end of the shielding ring body for engaging a surface of the shroud. The shielding ring body has a lip extending radially inwardly at the proximal end for engaging the tines of the female portion when the male and female portions of the connector are mated.

Abstract: The present invention relates to an implant, to an instrument for implantation of the latter and to a method for manufacturing this implant which includes an elongated body (10) between a free end and a head (18) along a longitudinal axis on the one hand and turns (12) of at least one threading on at least one portion of said body (10) in proximity to the free end, along the longitudinal axis on the other hand, characterized in that the body (10) includes a longitudinal internal conduit (11) in at least one portion to along the longitudinal axis, obtained by at least one first central machining operation parallel to the longitudinal axis and at least one second machining operation in a so-called transverse plane, not parallel to the longitudinal axis and crossing the wall of the body (10) as far as the longitudinal internal conduit (11) by making windows (15) communicating between said longitudinal internal conduit (11) and the outside of the body (10).

Abstract: A wall fastener assembly for use with a building wall system, with the wall fastener assembly including a fastener and an elongated, semi-rigid seal member. The fastener includes a shaft and a head, with the fastener configured to be secured to the wall system. The seal member includes opposed first and second ends, and a center bore that extends along the length of the seal member and is configured to receive the shaft of fastener. When the fastener is secured to the wall system the first end of the seal member is configured to compress against a portion of the wall system to form a first seal and the opposite second end of the seal member is configured to form a second seal to thereby seal the wall fastener assembly against the wall system.

Abstract: A vehicle assembly includes a first component having a stand-off that provides a cavity. The stand-off protrudes from an insertion side of the first component. The stand-off includes at least one side wall that extends from a floor of the cavity to at least one outer surface of the stand-off. The assembly further includes a second component that contacts the first component at an interface. The cavity is configured to receive a mechanical fastener that joins the first component to the second component. A distance between the floor of the cavity and the interface is greater in some areas than in other areas such that a cross-sectional thickness at a bottom of the cavity is varied.

Abstract: A wrench includes a driving unit located in the head of the wrench. A rod extends through the driving member and includes a stepped recess so as to control a bead in the radial hole of the driving member to secure a socket connected to the driving member. A rotary member is connected to the head and includes a room. A locking member is located in the room and locked to the driving member. A fixing area is formed between the locking member and the driving member so as to fix the locking member and the driving member together. The fixing area ensures that locking member is not separated from the driving member.

Abstract: A thermal insulating screw assembly includes a thermal insulating screw and a thermal insulating washer. The thermal insulating screw has a rotation head, a shank, and an external thread. A thermal insulating portion coats the rotation head and has a plurality of projections each of which is provided with a horizontal face, a vertical face, and an inclined face. The horizontal face is located at a top of each of the projections. The vertical face extends downward from the horizontal face. The inclined face extends inward and downward from the vertical face. The thermal insulating washer is positioned by the projections and has an axial hole which passes through the inclined face and the vertical face to the horizontal face, and is positioned on the horizontal face of each of the projections.

Abstract: Described herein is a pedicle screw for use in the thoracolumbar spine where the height can be adjusted intra-operatively before or after installation member of the longitudinal member. The pedicle screws with adjustable height may be made with a monoaxial or polyaxial configuration. The height of the pedicle screw can be lengthened or shortened.

Abstract: The present disclosed subject matter relates to a snap charm comprising a detachable stud and a detachable charm, with a stud head being formed of eight arms extending from the stud body in the shape of an eight-pointed star, the stud and charm each having a connecting means which matingly engage and allow for the anchoring of a variety of charms to objects such as a bracelet, flip-flop, sandal strap, or a strap for a backpack.

Abstract: A screw and an anatomy buttressing adaptor are provided. The screw includes a head portion, a shaft portion, and a central axis. The anatomy buttressing adaptor includes a body portion including a first end, an opposite second end, a lower surface, and an internal cavity extending through the body portion. The lower surface of the body portion being formed at least adjacent the second end thereof, and including spikes formed thereon and spaced therearound.

Abstract: A grommet (20, 30) as part of a fastening element for a building envelope essentially comprises a head (21), a tip (22) and a sleeve (23) therebetween, wherein the head (21) is essentially constructed as an extensive washer (24), the central hole of which is adjoined by the tubular sleeve (23). The tip (22) narrows essentially in a conical or tapered manner to a smaller diameter. The grommet (20, 30) has a sensor arrangement (25), with at least one RFID transponder with antenna and a sensor operatively connected to the transponder.

Abstract: A cover member includes a body member made of a composite material and including a mounting flange. A plurality of compression limiters are disposed in the mounting flange, the compression limiters have a predetermined thickness and an internally threaded aperture therein. The dual function compression limiters eliminate the need for separate threaded inserts. With the dual function compression limiter, every bolt location provides a potential location for a jack screw.

Abstract: A universal closure valve adapter attachable to a neck wall of a first container that forms a periphery of an opening having a diameter. The universal closure valve adapter includes a closure valve assembly that is attachable to a closure valve assembly of a second container. A flange transversely extending from the closure valve assembly of the first container. The flange includes a plurality of tank neck engagement assemblies. Each of the plurality of tank neck engagement assemblies are spaced apart from each other about the flange.

Abstract: A mounting system for supporting a plurality of photovoltaic modules on a sloped support surface, such as a sloped roof, is disclosed herein. The mounting system may include one or more support surface attachment devices, each support surface attachment device configured to attach one or more photovoltaic modules to a support surface; and one or more module coupling devices, each module coupling device configured to couple a plurality of photovoltaic modules to one another.

Abstract: A universal joint assembly includes a hollow upper shaft, a lower shaft extending at least partially within the upper shaft, and a cage having a plurality of bearing apertures. Each bearing aperture includes a pair of opposed loading pads having a distinct inner wall surface sector extending radially inward into the at least one bearing aperture. The cage receives at least a portion of the lower shaft and is positioned within the hollow upper shaft. The assembly further includes at least one upper tilt pin extending through the upper shaft and a bearing aperture of the plurality of bearing apertures, and a lower tilt pin extending through the lower shaft and a bearing aperture of the plurality of bearing apertures.

Abstract: A nail-shaped fastening element having a shank, at whose one end a tip is configured and at whose opposite other end a head is configured, and having a sleeve-shaped washer is disclosed. At a first end facing the tip, the sleeve-shaped washer has a first collar that narrows the opening cross section of the sleeve-shaped washer and, at a second end facing opposite the first end, it has a second circumferentially outwardly disposed collar.

Abstract: The blind rivet for fastening together a plurality of mounted components with mounting holes comprises a rivet body having a sleeve, a flange and a through hole; a mandrel having a slender stem and a head; and a washer. The head of the mandrel is adjacent to the sleeve-side end portion of the rivet body, the stem of the mandrel extends through the rivet body from the flange-side end portion, and the washer is mounted near the flange on the outer periphery of the sleeve of the rivet body. A portion of the outer peripheral surface of the sleeve adjacent to the flange is swaged to form a recessed portion so that the diameter in the other position is enlarged. The washer is pushed onto the enlarged-diameter portion and secured. The mounted components are fastened together between the enlarged end portion of the sleeve and the washer.

Abstract: A fastener assembly is provided. The fastener assembly includes a nut having an internally threaded portion and an annulus extending from the nut and configured for receiving the shank of an elongate fastener. A compression collar is configured for deflecting the annulus into at least one of fixed engagement with the shank or to impart a spring bias of the annulus against the compression collar upon tightening of the nut about a working surface.

Abstract: A releasable lock nut assembly for securing a bearing on a threaded hub may include a thrust washer including a disk portion and a peripheral skirt extending axially away from the disk portion, the peripheral skirt having a plurality of openings and a characteristic diameter measured at an axial location of the openings, and a protuberance proximate to at least one of the openings. The assembly may also include a lock ring inserted into the thrust washer, where the lock ring includes a plurality of tangs that extend beyond a lock ring major diameter such that the tangs fit within the openings of the thrust washer. The protuberance may be deformed such that all of the peripheral skirt is within the characteristic diameter, and the protuberance may define an internal envelope of the thrust washer where the internal envelope is larger than the major diameter of the lock ring.

Abstract: A ferrule (10) that is intended to be cast into a concrete element, such as a concrete panel. Engaged with the ferrule (10) is a washer assembly (22) that secures a plate (19) to the concrete element (16) for the purposes of securing the concrete element (16) to an adjacent concrete element (17). The washer assembly (22) has a threaded fastener (21) that can be adjusted angularly for engagement with the ferrule (10).

Abstract: A compression limiter is disclosed that comprises an upper surface and a lower surface. The compression limiter further comprises an inner surface that defines a passageway configured to accommodate a fastener and an outer surface configured to engage a structure in which the compression limiter is placed. A first retainer projects outwardly from the outer surface and includes a first retention surface that has at least a planar portion. The first retainer further includes an undercut surface disposed inwardly from the first retention surface so as to create a corner extending in a direction with at least a component perpendicular to the longitudinal direction. A method of forming the compression limiter is also disclosed.

Abstract: Gas turbine engine systems and related methods involving thermally isolated retention are provided. In this regard, a representative method for attaching a gas turbine engine component includes using a fastener, varying in diameter along a length thereof, to prevent a portion of a component from being crimped between surfaces to which the component is attached such that the component moves relative to the surfaces responsive to thermal cycling of a gas turbine engine of which the surfaces and the component are constituent parts.

Abstract: A fastener is disclosed for use in a high vibration application wherein the fastener is engaged to a blind hole. The fastener includes a lock washer including wedge locking action fastening features and a head of the fastener including mating wedge locking action fastening features. The wedge locking action fastening features include a greater inclination than a pitch angle of the fastener such that the fastener is prevented from backing out.

Abstract: A penetrating fastener has a fastener head and fastener tip spaced apart by a longitudinally oriented fastener shaft. A tetherable washer has a substantially planar base surface having a fastener aperture extending therethrough. A longitudinally oriented wall extends longitudinally upward from at least a portion of the base surface to form a concave fastener cavity configured to receive at least a portion of the fastener head. Two tether apertures extend laterally through the wall and are laterally spaced apart along the wall. Both of the tether apertures are laterally arranged along the wall in a rotationally asymmetric configuration. A first one of the tether apertures is located a second longitudinal distance from the base surface and a second one of the tether apertures is located a third longitudinal distance from the base surface. The tether apertures are configured to simultaneously accept a tether extending through both of the tether apertures.

Abstract: A cable lug and a method of use is provided. The cable lug has a receiving tube section for a cable, a flat piece-connecting section that is molded on and is provided with a bore, and a nut which is captively and preferably rotatably mounted on the flat piece-connecting section. The nut does not penetrate the flat piece-connecting section while being mounted by a shaped mounting material section of the flat piece-connecting section, which extends into an undercut in the nut. The mounting material section is in the undercut with an axial clearance. The mounting material section is rooted in a lowered in a step-type manner in the flat piece-connecting section. The lowered area is rotationally symmetrical and is provided with a conical section which opens outward and vertically and encompasses at least one conical area.

Abstract: A roof insulation fastening system employs a fastener and a compression plate with a tube which interacts with the compression plate to permit the plate to vertically move relative to the head of the fastener when the adjacent area and/or plate is subject to excessive compression. The tube includes a retainer shoulder and a pair of tabs wherein the plate captures the tube. The tube includes a throat and a tapered portion with a throughbore. The fastener is inserted into the tube and secured in place so that the head is retained at the intersection of the throat and the tapered portion and the shank is secured into the roofing substrate.

Abstract: Tie fastening devices, systems apparatus, and methods of fastening and staking concrete cloth, and landscape and erosion control stabilizer sheets and timbers in place with a drill adapted fastener. The fasteners can elongated with anvil top ends that can be mounted to a drill chuck and lower cutting heads with arrow shaped blades that can raised burr edges for driving into ground surfaces.

Abstract: A load bearing assembly includes a first outer washer having an outwardly exposed annular surface for engaging a clamping surface of a fastener and a second outer washer having an annular surface outwardly exposed in an opposite direction from the outwardly exposed annular surface of the first outer washer, the outwardly exposed annular surface of the second outer washer for engaging a clamping surface of an object to which the fastener exerts a clamping force. An intermediate washer is positioned between the first outer washer and the second outer washer. A locking mechanism engages between the first and second outer washers to axially interconnect the washers together in a stacked configuration with the intermediate washer positioned between the first and second outer washers and in a manner so that the washers are rotatable with respect to one another.

Abstract: A fastener for use in fastening insulation to a substrate, comprising a fastener body having a head for engagement with an outer face of the insulation, a tubular stem extending inwardly from the head for penetration through the insulation into engagement with the substrate, the stem having a pointed tip portion remote from the head for penetration of the insulation and the stem being hollow to receive a fastening pin having a pointed end fully enclosed within the stem adjacent the tip, the interior of the stem being adapted to receive a fastener guide of a fastening tool operative to drive the pin into the substrate by means of a driving piston propelled along the fastener guide by gas pressure on firing of the tool, the fastener being mounted to the fastener guide prior to penetration of the insulation whereby penetration of the insulation by the stem occurs by manual pressure applied by an operator to the tool prior to firing of the tool to drive the pin into the substrate, the external surface of the stem

Abstract: A hollow fastening nut assembly including an upper head adapted to engage a wrench or other tightening tool and an integral co-axial, internally threaded lower section of reduced diameter adapted for insertion into an access opening in a fastened component. The lower section acts as a compression limiter. An optional annular disc spring may be disposed about the internally threaded lower section for engagement with the rear surface of the fastened component. A locking structure may be disposed at the exterior surface of the internally threaded lower section to engage the interior of the access opening to lock the nut assembly in place.

Abstract: A compressor may include a shell, a housing fixed within the shell, first and second scroll members disposed within the shell, a sleeve guide, a fastener, and a washer. The first scroll member may have a first spiral wrap extending from a first end plate and a radially outward extending scroll flange defining an opening. The second scroll member may have a second spiral wrap intermeshed with the first spiral wrap. The sleeve guide may be disposed within the opening in the scroll flange and may define an axial bore. The fastener may be disposed within the axial bore and engaged with the housing. The washer may be located between a head of the fastener and the scroll flange. A first portion of the washer may extend radially outward from the fastener head and may define a rotational stop inhibiting washer rotation through engagement with a rotationally fixed structure.

Abstract: A gripping washer includes a washer body having first and second rigid support surfaces. A fastener hole extends between the first and second rigid support surfaces. An inner washer perimeter extends around the fastener hole. One or more elastomeric gripping tabs are coupled with the inner washer perimeter. The one or more elastomeric gripping tabs extend inwardly into the fastener hole from the inner washer perimeter. The elastomeric gripping tabs are pliable relative to the first and second rigid support surfaces of the washer body and deform and grip the washer with a fastener passed through the fastener hole. By gripping a fastener with the elastomeric gripping tabs the gripping washer is anchored to the fastener and substantially prevents decoupling of the gripping washer from the fastener prior to installation (e.g., fastening with a work piece). Gripping of the fastener with the gripping washer thereby minimizes foreign object debris.

Abstract: A bonding washer for making electrical connection between two metal pieces that are to be mechanically fastened together. The washer, to be interposed between the two metal pieces, may be constructed so as to fasten to one of the pieces before the two pieces are joined. Teeth on the washer, positioned at right angles to the plane of the washer, are forced into each of the two metal pieces when the fastener is tightened, making electrical connection between the two metal pieces.

Abstract: A direct load indicating fastener assembly includes a flange fastener of one-piece construction having a head with an integral flange. A load indicator has a flat base, a plurality of protuberances on the base and a peripheral rim. At least a portion of the peripheral rim overlies the fastener flange and captures the fastener in assembly with the load indicator while permitting free rotation of the fastener with respect to the indicator. The fastener preferably is a flange nut or a flange bolt. A hardened metal washer may be disposed between the load-indicating protuberances on the base and an undersurface of the fastener head.

Abstract: A retaining cam (20) for a rotatable fastener for connecting components (16, 17) is provided. The retaining cam (20) has a housing (22) pivotally supported on a base plate (24), by which the retaining cam (20) can be fixedly connected to one (17) of the components (16, 17). A screw (30) is secured rotationally fixed in the housing (22). A fastener bolt (40) rotatably connected to another (16) of the components (16, 17) can be screwed onto the screw (30). Spring elements are associated with the screw (30) for generating an elastic pretension for securing the fastener bolt (40) against rotation. The housing (22) is pivotally supported on the base plate (24) by a spherical washer (50). An angle deviation between the center axes of the retaining cam (20) and the fastener bolt (40) can be compensated for by pivoting the retaining cam on the spherical washer (50) while maintaining full-surface contact of the retaining cam (20).

Abstract: In various aspects, the present application describes a heating element assembly for a liquid heater, embodiments of which may include an electrically conductive termination rod with a base portion defining a securement opening. An electrically conductive fastener may include a shank portion for fitting into the securement opening. The heating element assembly may have a head portion larger than the securement opening, and an electrical resistance heating element comprising a continuous coil. An end portion of the continuous coil may be formed to loop around the fastener shank portion. The end portion may be in electrical contact with the fastener head portion and the termination rod base portion. An adjacent portion of the continuous coil may be formed to clear the fastener head portion as the adjacent portion extends from the end portion. The continuous coil may have a coil axis substantially aligned with a lengthwise axis of the fastener.

Abstract: A screw fixation system includes a plate having opposed first and second surfaces, and a hole defined in the plate which extends between the first and second surface. A screw is included having a head and a shaft extending from the head and defining a longitudinal axis for the screw, the shaft of the screw being configured and adapted to be inserted into the hole. A retainer is circumferentially positioned around the shaft of the screw and proximate to the screw head. The retainer is configured to engage with the plate proximate the hole when the shaft of the screw has been inserted into the hole so as to resist removal of the screw from the hole and to allow removal of the screw from the hole when a preset torque is applied to the screw.

Abstract: An low-profile cam locking fastener assembly in which a locking nut is connected to a locking washer through a tubular skirt that extends from the nut opening. The skirt and nut opening are coaxial having contiguous inner surfaces that are threaded to receive a bolt or stud. The washer is mounted to the skirt so as to be rotatable with respect to nut as well as axially movable to a position in which cooperating cam elements on opposing faces between the washer and the nut are separated. The cam elements are arranged so that when the nut and washer are fastened down to a bolt or stud on a workpiece, the cam elements engage one another to substantially prevent the nut from loosening from the threaded bolt/stud.

Abstract: A fastening device comprising at least one nut, at least one support unit, and at least one spring element, with the nut, the support unit, and the spring element being constructed and matched to each other in such a way that the spring element exerts a force between the nut and the support unit.

Abstract: A washer body bearing hardened balls in apertures in the washer body provides a counter-torque resistance in a fastening. The hardened balls form projections that indent the underside of a fastener head and an adjacent fastening joint surface during tightening of the fastening to prevent rotation of the fastener head while a nut is driven to tighten or loosen the fastening. A reservoir portion of the apertures in the washer around the balls receives the material displaced during indention to allow full contact of the washer with the fastener head and joint surface. The hardened balls provide point loads for ready indentation upon minimal loading to prevent rotation of the fastener, obviating the need for a counter-torque wrench.

Abstract: Self-locking nuts help prevent the nut from backing off of a spindle or other type of threaded shaft. A single piece nut assembly is provided that is self-locking and comprises a nut subassembly and a washer subassembly. Nut and washer subassemblies are secured together, and do not require any special tools for installation or removal. The washer has an edge which is formed/rolled over a lip extending from the bottom edge of the nut when assembled to provide the unitized assembly. The nut and washer are held apart by a spring, such as a wave spring, until the washer contacts the face of the object to which the nut is being secured. At this point the spring is compressed to engage the nut with the washer, and engage holding elements located in the nut with a holding feature located on the washer and prevent movement between the washer and nut.

Abstract: An electronic device includes, a circuit board including a through hole, a member including a screw hole, a screw including a screw body having an outer diameter smaller than an inner diameter of the through hole and a screw head having an outer diameter larger than the inner diameter of the through hole, wherein the screw body penetrates through the through hole to engage with the screw hole and the screw head is disposed on an opposite side of the circuit board to the member, and a first washer provided between the screw head and the circuit board, the first washer including a first washer body and a plurality of first washer legs extending from the first washer body toward the circuit board, the first washer legs being in contact with the circuit board and having a characteristic of reducing stress on the circuit board upon being heated.

Abstract: The leverage device is intended to be installed on motorcycle stands that currently use a hex head machine screw for width adjustment. It consists of a) a female hex portion to mate with the hex head of the machine screw, b) a lever portion to be actuated by the user and c) a flat bottom to keep it captive to the machine screw. The device allows the user to loosen the screw slightly for width adjustment then re-tighten it without the use of tools. The low profile device is installed on the motorcycle stand to become a permanent part of the stand, unlike a wrench that is separate.

Abstract: A bonding washer for making electrical connection between two metal pieces that are to be mechanically fastened together. The washer, to be interposed between the two metal pieces, is constructed so as to fasten to one of the pieces before the two pieces are joined. Teeth on the washer, positioned at right angles to the plane of the washer, are forced into each of the two metal pieces when the fastener is tightened, making electrical connection between the two metal pieces.