Abstract: A lock nut is useable for setting a bearing to preload or endplay. A plurality of preload markings are circumferentially spaced apart on the nut. The distance between the preload marking corresponding to a preselected amount of preload applied or reduced on said bearing when the nut is (i) tightened to apply a preload force to said bearing or (ii) loosened to reduce a preload force on said bearing, respectively. A plurality of endplay markings are also circumferentially spaced apart on the nut. The distance between the endplay markings, corresponding to a preselected amount of endplay increased or reduced in said bearing when the nut is (i) tightened to reduce endplay on the bearing or (ii) loosened to increase endplay in said bearing. The use of endplay and preload markings enables setting of a bearing on an axle or spindle to either an endplay setting or a preload setting by adjusting the rotation of the lock nut according to the endplay markings or the preload markings, respectively.

Abstract: An anti-loosening fastener, including a key-bolt-receiving bolt, including a head section to receive at least one tool thereon, a rear cylindrical section disposed on at least a portion of the head section to extend a predetermined distance away from the head section, the rear cylindrical section including a key-bolt-receiving aperture disposed within at least a portion of the rear cylindrical section to receive an external fastener therein, and an internal thread section circumferentially disposed on an inner surface within the key-bolt-receiving aperture, and a key bolt to removably connect to at least a portion of the key-bolt-receiving bolt.

Abstract: A device for mounting an attachment part to a carrier part (1) has two mutually opposite legs (2, 3) and an external head plate (14) which are each arranged at a distance from one another. The head plate (14) and the leg (3) adjacent to the head plate (14) have threaded structures (11, 15) which, through an interaction of a blocking unit (16), having a stop portion (17) and an overlap portion (18), with a holding down means (7) and with the leg (3) bearing a threaded structure (11), are arranged at a fixed distance from one another to form an internal thread.

Abstract: A fastener system includes a fastener including a fastener first end and a longitudinally opposed fastener second end, and an anchor configured to receive and capture the fastener upon rotation of the fastener in a first direction, wherein the anchor is further configured to engage the fastener first end upon complete rotation of the fastener in the first direction, and the anchor is further configured to prohibit further rotation in a second direction, opposite the first direction, upon engagement with the fastener first end.

Abstract: A lock nut system includes a nut, a keeper engagement with the nut to inhibit movement of the keeper relative to the nut, and a keeper retaining member. The keeper has a radially inner side configured to engage a shaft to inhibit rotational movement of the nut relative to the shaft when the keeper engages the nut and a radially inner side engages the shaft. The keeper retaining member is secured to the keeper and is engageable with the nut to hold a keeper axially such that keeper is engaged with the nut. A cover member is located on an opposite side of the keeper retaining member relative to the nut and engaged to the keeper retaining member to inhibit a separation of the cover member from the keeper retaining member in such that that the separation of the cover member from the keeper retaining member provides a visual indication to a user.

Abstract: An anti-rotation device for a nut in tightened position on a male part, includes a plurality of upper notches provided on one end of the nut, the upper notches extending along a longitudinal axis of the nut, a plurality of lower notches provided in one peripheral zone of the male part, the lower notches extending along a longitudinal axis of the male part, and the lower and higher notches at least partially overlapping when the nut is in tightened position on the male part, a ring including at least one locking component accommodated both in one of the lower notches of the male part and in one of the higher notches of the nut.

Abstract: A method for method for solution hardening of a cold deformed workpiece of a passive alloy containing at least 10% chromium, which method includes dissolving at least nitrogen in the workpiece at a temperature T1, which is higher than the solubility temperature for carbide and/or nitride and lower than the melting point of the passive alloy, wherein dissolution of nitrogen at temperature T1 is performed to obtain a diffusion depth in the range of 50 ?m to 5 mm, and cooling the workpiece after the dissolution step at temperature T1 to a temperature which is lower than the temperature at which carbides and/or nitrides form in the passive alloy, wherein the cooling step takes place in an inert gas not containing nitrogen. Further, a member, such as a lock washer for securing bolts or nuts prepared using the method.

Abstract: A nut assembly and a holddown assembly using the nut assembly are described, including methods of manufacture and assembly. The nut assembly may include a body portion having first and second openings with an internal wall extending between them. A rotation-inhibiting wall may be included between the first and second openings. A nut portion configured to move axially within the internal wall of the body portion includes structures for co-acting with a rotation-inhibiting wall to limit or prevent rotation of the body portion and the nut portion relative to each other. A nut portion and a body portion extending around the nut portion have limited axial movement relative to each other due to axial engagement between adjacent surfaces on the nut portion and the body portion.

Abstract: A pipe hanger method and apparatus wherein a bolt is threaded upwardly through a first opening within a lower arm portion of a saddle, then, in one form, through an opening in a liner, then through a larger opening in the upper arm portion of the saddle. The opening is non-cylindrical in shape. A nut is then installed on the bolt. The nut has a tapered end portion which interoperates with the shape of the opening in the upper arm of the saddle. The nut is hand-tightened and then is aligned with the opening so that the small end portion would drop into the opening. A wrench is then used on the head of the bolt to rotate the bolt for the purpose of drawing the nut and bolt together and applying a clamping force on a pipe positioned within the saddle. The liner extends along the inside of the bolt and then extends about the pipe, between it and the bight of the saddle, and then in one form extends along the inside of the upper arm portion.

Abstract: A self-drilling bolt and nut assembly includes a nut which has a window to permit visual inspection of the fastener thread upon engagement with the nut. The nut also includes a protective cap or receives a protective cap so that upon threadably engaging the fastener with the nut, the drill tip of the fastener is automatically received in the cap. The nut also has at one end a plurality of projections to enhance the locking engagement. The self-drilling bolt may have an integral washer and employ a clamping plate engageable against the washer.

Abstract: It is an object to provide a locking bolt, which is capable of tightly fixing a member or the like at an extremely high degree of firmness without being loosened even when vibrations are repeatedly applied thereto, and is manufactured in an extremely facilitated manner. The locking bolt includes: a shank section (1) threaded on an outer circumference thereof; and a head section (2) provided at one end of the shank section (1). The head section (2) includes: a main body portion (201) having a hexagonal cross-sectional shape; and a cylindrical skirt portion (202) provided continuously with the main body portion (201) and formed so as to be spaced radially outward from the main body portion (201) in an expanding manner along a concave surface using a catenary curve surface.

Abstract: The invention is directed at joint assembly which includes a first part and a second part to be assembled together. The first and second part are secured together via a set of fasteners and a set of attachment portions. The set of attachment portions cooperate with one of the first or second parts and receive the set of fasteners.

Abstract: A hollow element such as a hollow rivet or a nut element for attachment to a component consisting of a composite material such as a fiber reinforced plastic part or a fabric reinforced plastic part is presented. The element has a flange part and a shaft part extending away from the flange part and/or a rivet section, wherein the rivet section, is present, can also be formed at the free end of the shaft part, with the a hollow element furthermore having a central passage, which is optionally provided with a thread cylinder. The hollow element is used in combination with an auxiliary tip which is either inserted from the flange side of the element through the passage, or from the side of the free end of the shaft part of the rivet section into the passage, such that a conically converging region of the auxiliary tip projects from the free end of the shaft part or of the rivet section.

Abstract: A combination cutter body and a locking screw for mounting the cutter body to an adapter is disclosed. The cutter body includes a plurality of threaded bores that extend radially through a sidewall of the cutting body. The threaded bores are adapted to receive a corresponding threaded setscrew. The locking screw includes a head having a plurality of indentations around a circumference of the head. A central axis of each threaded bore is offset by a distance from a central axis of each indentation to cause an axial force to be exerted on the cutter body when an end of the setscrew engages a respective indentation to tightly seat the cutter body against the adapter.

Abstract: A hub nut for a planetary transmission has a body configured to secure against unscrewing and to seal the planetary transmission.

Abstract: A nut comprises a metal member including a nut body having an internally threaded portion formed therein and an extension formed on one end of the nut body so as to surround an opening of the internally threaded portion, the metal member being subjected to surface treatment; and a ring member made of a synthetic resin, having an outer peripheral portion united with an inner side of the extension and having a ring inner diameter substantially equal to a minor diameter of the internally threaded portion, the outer peripheral portion being united with the inner side of the extension by insert-molding using the metal member as an insert; wherein the extension has at least one recess formed in an inner portion, and the outer peripheral portion has a rotation-preventing portion fit into the at least one recess, the rotation-preventing portion being formed by the insert molding.

Abstract: In various representative aspects, an apparatus for clamping and grounding an upper and lower solar panel mounting rail is disclosed herein. The apparatus comprises a fastener with an enlarged end, and a shank, with the enlarged end having one or more sharp protrusions that resemble teeth, and a washer with one or more sharp protrusions, and an opening. When installed, the shank is inserted through the opening of the washer, the sharp protrusions of the enlarged end penetrate either the lower or upper mounting rail and the sharp protrusions of the washer penetrate the other mounting rail while at the same time creating a grounding path through the apparatus.

Abstract: A heat dissipating assembly which releases heat produced by an electronic device comprising a heat dissipating device and a plurality of elastic fastening members. The heat dissipating assembly includes a base plate having a plurality of engaging holes formed thereon. Each elastic fastening member includes a connecting member and a spring. The connecting member has a head portion and a bolt body that extends therefrom. The bolt body has an outer thread formed on the surface thereof and is being insertable into the respective engaging hole. The spring includes a winding portion woundable around the outer periphery of the bolt body, a clutching portion outwardly extended and downwardly bent from the bottom end of the winding portion to the base surface of the base plate, and a fastening segment extending from the clutching portion back under the winding portion. The instant disclosure further provides an elastic fastening member.

Abstract: A mounting apparatus includes a bolt and a nut. The nut includes an inner member having a first engagement feature and a threaded opening, the threaded opening configured to receive the bolt, and an outer member having a second engagement feature. The inner member is axially coupled to the outer member via a snap fit. The inner member is configured to rotationally lock with the outer member through the interaction of the first engagement feature and the second engagement feature via an application of a threshold torque.

Abstract: A threaded fastener assembly comprising a threaded fastener (12) and a length of locking wire (16) comprising a shape memory alloy material. The locking wire (16) is pre-worked such that the wire contracts when the locking wire (16) is heated from a temperature below an austenite start temperature (As) of the locking wire (16) to a temperature above the austenite start (As) temperature of the locking wire (16).

Abstract: A hollow element such as a hollow rivet or a nut element for attachment to a component consisting of a composite material such as a fiber reinforced plastic part or a fabric reinforced plastic part is presented. The element has a flange part and a shaft part extending away from the flange part and/or a rivet section, wherein the rivet section, is present, can also be formed at the free end of the shaft part, with the a hollow element furthermore having a central passage, which is optionally provided with a thread cylinder. The hollow element is used in combination with an auxiliary tip which is either inserted from the flange side of the element through the passage, or from the side of the free end of the shaft part of the rivet section into the passage, such that a conically converging region of the auxiliary tip projects from the free end of the shaft part or of the rivet section.

Abstract: A fastener for locking two or more sheet sections together comprises a shaft tapered at one end and having a driving head at the other end with a relatively coarse thread running from the tapered end towards the head and a relatively fine thread between the coarse thread and the head. The fine thread has a pitch which is approximately equal to the thickness of the sheet sections and extends from the head for from two to six threads.

Abstract: A method of locking a fastener assembly against rotation relative to a laminar composite workpiece, the method comprising: passing a fastener through the workpiece; fitting a washer to the fastener; locking the washer against rotation relative to the workpiece; screwing a nut onto the fastener so as to clamp the washer against the workpiece; and locking the nut against rotation relative to the washer; a a fastener assembly comprising: two or more fasteners; two or more nuts; a washer with two or more holes each sized to receive a respective one of the fasteners; and a locking mechanism adapted to prevent relative rotation between the nuts and the washer after the nuts have been screwed up to a desired torque.

Abstract: A nut assembly and a holddown assembly using the nut assembly are described, including methods of manufacture and assembly. The nut assembly may include a body portion having first and second openings with an internal wall extending between them. A rotation-inhibiting wall may be included between the first and second openings. A nut portion configured to move axially within the internal wall of the body portion includes structures for co-acting with a rotation-inhibiting wall to limit or prevent rotation of the body portion and the nut portion relative to each other. A nut portion and a body portion extending around the nut portion have limited axial movement relative to each other due to axial engagement between adjacent surfaces on the nut portion and the body portion.

Abstract: A captive securing means for a screw has a shaft for holding the screw and a retaining means arranged in the shaft, the retaining means resting, in the inserted state of the screw, at a tangential point on the outer circumferential surface of the screw, the retaining means arranged on the inner circumferential surface of the shaft, and the retaining means extending from the inner circumferential surface of the shaft into the free region of the shaft such that at the tangential point, the angle between the direction of extent of the retaining means and the outer circumferential surface of the screw is <90 degrees. Consequently, the screw is axially moveable in the shaft without the quality of the captive securing means being impaired, and the screw is captively secured in the shaft by the retaining means resting on the outer circumferential surface of the screw.

Abstract: A locknut system having a projecting screw threaded member with a first external thread. A nut is mountable on the projecting screw threaded member by means of a corresponding thread. A second different screw thread is formed on the projecting screw threaded member. The second screw thread is of a different hand or a different pitch from the first screw thread. A locking member has a screw thread for engagement with the second screw thread of the projecting screw threaded member and has an engaging surface which can be brought into abutting contact with a corresponding engaging surface on the nut by mating the thread of the locking member with the second thread of the projecting screw threaded member. A coupling member operates to couple the locking member and the nut to substantially prevent relative rotation there between.

Abstract: A lock for locking a movable member to a fixed member, wherein the movable member has a recess, and wherein the fixed member has a threaded through bore. The lock includes a head, a stem, first locking apparatus, and an optional second locking apparatus. The head is for selective rotational resting in the recess in the movable member. The stem selectively movably depends from the head and is for selectively engaging in the threaded through bore in the fixed member. The first locking apparatus selectively prevents rotation of the head relative to the stem to thereby prevent rotation of the stem and withdrawal thereof from the threaded through bore in the fixed member to thereby selectively prevent removal of the lock from the fixed member.

Abstract: A pedestal (18) for an access floor assembly (10), the pedestal (18) comprises a stand portion and a head portion. The stand portion has a base plate (21) for resting upon a sub-floor (20), and a stem (22) extending upwardly therefrom. The head portion has a platform (24) and a threaded shaft (26) extending downwardly therefrom. The pedestal (18) includes a lockable nut (28) which has a thread (29) adapted to screwably engage the threaded shaft (26), wherein the lockable nut (28) has at least one detent (30) to lock with the stem (22) in order to prevent the rotation of the lockable nut (28) when abutted against the stem (22).

Abstract: A hybrid clinch-type standoff consists of two component parts, a metal core base and a overmolded plastic barrel. The base has a through-bore and a displacer flange at the bottom. A first undercut is located immediately above the flange and extends upwardly along an outside surface of the base for providing clinch attachment of the base to a substrate. A frustoconical ramp convergent in the upward direction lies along the outer surface of the base is and is located directly above the first undercut. An axially extending segmented ring with circumferential teeth is located at the top of the base. The overmolded plastic tubular barrel composed of plastic fills the second undercut and surrounds the segmented ring. The barrel has an inner portion including a threaded inner wall which extends downardly inside the through-bore to a point flush with the bottom of the flange.

Abstract: A self locking fastener is disclosed herein which is self-contained and resists loosening even when used in applications and environments where the fastener is exposed to vibration. In one form the present invention provides a self locking screw-type fastener, methods of manufacturing and/or assembling such fasteners, and methods of fastening using such fasteners. In another form, the invention provides a self locking nut-type fastener, methods of manufacturing and/or assembling such fasteners, and methods of fastening using such fasteners. In still other forms, the invention provides components for creating self locking fasteners using at least in part conventional materials and/or fasteners, methods of manufacturing and/or assembling such fasteners, and methods of fastening using such fasteners. In another form, the invention provides prepackaged kits for customizable fasteners that purchasers can buy and use to assemble customized fasteners in accordance with the invention.

Abstract: A screwed connection has a threaded bolt; a nut; a washer arranged between the nut and a surface of a component to be clamped; a screwing device with a housing, a holding tool connected to the housing, and a tightening tool that engages positively the nut; a measuring element arranged in the washer for measuring a compressive force generated by tightening the screwed connection. The washer has an anti-rotation device oriented toward the surface of the component. The outer periphery of the washer is positive-lockingly engaged by the holding tool. The washer has no positive or frictional connection to the threaded bolt, and the holding tool has no torque supporting action on the threaded bolt or on any other part so that a reaction moment, generated when tightening the nut, is introduced from the housing of the screwing device through the washer into the component to be clamped.

Abstract: A self-drilling bolt and nut assembly includes a nut which has a window to permit visual inspection of the fastener thread upon engagement with the nut. The nut also includes a protective cap or receives a protective cap so that upon threadably engaging the fastener with the nut, the drill tip of the fastener is automatically received in the cap. The nut also has at one end a plurality of projections to enhance the locking engagement. The self-drilling bolt may have an integral washer and employ a clamping plate engageable against the washer.

Abstract: An anti-unlock screw device (100) for connector designed to maintain the connection between two connection elements (1, 2), includes a cylindrical sleeve (101) provided with a row of saw-tooth notches (105) arranged on an internal circumference of a rear portion. The device also has an internal ring (106) mounted in the rear portion of the cylindrical sleeve so that it can be positioned between the cylindrical sleeve and the first connection element, the internal ring including at least one catch (107) capable of cooperating with the saw-tooth notches of the cylindrical sleeve. A blocking device (110, 111, 112, 113) keeps the internal ring fixed relatively to the cylindrical sleeve in a first sense of rotation (V) and inversely keeps the internal ring free in rotation relatively to the cylindrical sleeve in a second sense of rotation (DV).

Abstract: The present invention relates to a device for holding a faucet handle to a valve stem. The device tightens onto the valve stem when drawn upwardly into the faucet handle.

Abstract: A lockable nut comprising a first threaded bore configured for use with a wire rope clamp. The lockable nut comprises a threaded bore for engagement with a u-bolt, for example, and a transverse bore configured to receive a locking shaft, such as a shackle of a lock. As a safety and/or security feature, a pair of lockable nuts may be coupled to a wire rope clamp connected to a wire rope, and when the locking shaft is in place, the wire rope clamp can not be removed from the wire rope.

Abstract: Of application in processes of assembly by screwing between a plastic piece and a supporting base, for example a bodywork, from which a fastener stands out perpendicularly. It is constituted by a circular base and a hexagonal body traversed by a central drilled hole which passes through and has a main segment and an expansion in which are some slightly arched internal protuberances which constitute the fastening means for connection of the nut to the fastener after a slight rotation of or pressure from the former and it determines the fastening and provisional positioning of the plastic piece with respect to the supporting base prior to its screwing. During the screwing operation the cutting effect which the metal fastener applies on the plastic walls of the drilled hole gives rise to a thread.

Abstract: A coupling member can releasably couple a blade protector to a tool body of a gardening tool. The coupling member is movably and non-removably coupled to one of the tool body and the protector.

Abstract: A locknut system having a projecting screw threaded member with a first external thread. A nut is mountable on the projecting screw threaded member by means of a corresponding thread. A second different screw thread is formed on the projecting screw threaded member. The second screw thread is of a different hand or a different pitch from the first screw thread. A locking member has a screw thread for engagement with the second screw thread of the projecting screw threaded member and has an engaging surface which can be brought into abutting contact with a corresponding engaging surface on the nut by mating the thread of the locking member with the second thread of the projecting screw threaded member. A coupling member operates to couple the locking member and the nut to substantially prevent relative rotation there between.

Abstract: The present invention relates to a device for holding a faucet handle to a valve stem. The device tightens onto the valve stem when drawn upwardly into the faucet handle.

Abstract: A hot pressing process, particularly for providing metal unions couplings for pneumatic, hydraulic and fluid-operated circuits, and a resulting metal union. The hot pressing process comprising: a step of preheating aluminum alloy bars, a step of pressing the part to be obtained, a thermal hardening treatment, and a thermal treatment for artificial aging. The standard cycle further provides for a step of solubilization of the pressed part, performed between the step of pressing the part to be obtained and the thermal hardening treatment. The alloy preferably comprising (weight percent): Si 0.6-1.4%, Fe 0.7%, Cu 0.2-0.5%, Mn 0.2-1%, Mg 0.6-1.2%, Cr 0.3%, Zn 0.3%, Ti 0.2%, Pb 0.4%, Bi 0.5-1.5%, balance aluminum. The process can include a solutionising step after the pressing step.

Abstract: The present disclosure shows an anti-rotation bolt for fastening reactor plates to prevent subsequent SCC problems wherein the bolt head has a circumferential series of anti-rotation tabs extending from the head of the bolt which are moved in by a restrainer cone which is placed on top of the bolt to allow its insertion into the plates and is removed for locking the tabs into detents formed in one of the plates to provide anti-rotation. The cone is again moved over the tabs during the removal of same leaving the bolt undamaged and fit for reuse.

Abstract: A lock nut system includes a molded nut having a plurality of teeth and a molded keeper having a plurality of keeper teeth engageable with the plurality of teeth to inhibit movement of the keeper relative to the nut when the plurality of teeth engages the plurality of keeper teeth. The keeper has a radially inner side configured to engage a shaft to inhibit rotational movement of the nut relative to the shaft when the plurality of teeth engages the plurality of keeper teeth.

Abstract: A device for mounting components, such as metal sheets, on one another, includes a clamp with external elastic U-shaped tongues that slide over an edge of a first component, and a section that is located between the tongues and includes an internal thread, and a screw that can engage the internal thread for mounting a second component on the first component. The screw has a thread pitch suitable for plastic materials and a correspondingly small flank angle. The internal thread has a region that is tapped, is located in, and helically extends from the central clamp section. The internal thread has more than one flight and one thread pitch for engaging the thread pitch of the screw thread.

Abstract: A secure connection between the bottom nozzle of a nuclear fuel assembly and the control rod guide thimbles having two or four crimped pockets in the side wall of a bottom nozzle leg counterbore which are formed by drilling two or four blind holes through the top surface of the bottom nozzle. After attaching the bottom nozzle to the fuel assembly with a crimp bolt a pneumatic tool is then inserted into a flanged cup feature on the crimp bolt head and the flanged portion of the cup feature of the crimp bolt is deformed into the crimp pockets. The crimp pockets are contained within the leg counterbore and prevent the screw from rotating or falling out of the assembly in the event of preload loss or screw fracture.

Abstract: A structural member for a vehicle has a slot extending into one structural wall thereof, for receiving and holding a bolt, wherein said structural member including said slot has been formed by extrusion. The slot extends the length of the structural member for slidably receiving the head of one or more bolts wherein the land area of each bolt head extends beyond the slot opening to overlay the wall area carrying the slot. Each bolt carries at least two flat faces below its head wherein the juxtaposed edges of the slot carrying wall retains, i.e., refrains, the bolt from rotating. The slot includes an interior wall or sidewalls continuous with the slotted structural wall. The structural member may include an I-beam, a rectangular tube, a C-channel and the like. Corners are radiuses and right angles are avoided to reduce or remove stress risers.

Abstract: A locking device is provided that includes a nut having a body portion and an end portion. The end portion has a proximal end proximate to the body portion and a distal end. The nut has an inner surface defining a nut aperture that extends through the body portion and the end portion with the inner surface of the nut being at least partially threaded. The locking device also includes a bolt having a head and a body. The head of the bolt defines a head aperture therein that extends into the body of the bolt. The body of the bolt is at least partially threaded to matingly engage the threaded inner surface of the nut. The body also defines at least one slot therein that is in communication with the head aperture. Slats are disposed along the distal end of the end portion of the nut. The slats are configured to engage the at least one slot defined in the body of the bolt.

Abstract: A fastener, such as a housing, for mounting to a structure, such as a panel, that has an aperture formed therethrough. The fastener includes a shank member and an annular nut member that is configured to align coaxially with the shank member. The shank member is inserted through aperture in the structure and the nut member is placed on the shank member. Teeth on the radially outwardly facing surface of the shank member engage a pawl, such as one or more teeth, on the radially inwardly facing surface of the nut member to lock the nut member to the shank member. Removal of the nut member is effected by rotating the nut member to disengage the pawl from the teeth, thereby permitting longitudinal displacement of the nut member off of the shank member.

Abstract: A lockable nut system for use with threaded steel bar which includes a screw threaded nut for engagement with the threaded steel bar and a locking member which is slidably engageable with the bar. The locking member is adapted to resist rotation about the bar and is also axially engageable with the nut to prevent rotation of the nut. The locking member has one or more fingers to engage the nut with an end of the finger being displaced to engage the nut as a result of deformation of a finger actuating tab or a dished body of the locking member. The locking member may engage the bar by displacement of an end of at least one tongue as a result of deformation of a tongue actuating tab during compression between the nut and a second structure.

Abstract: A quick lock nut (1) for positive friction locking securement of a disc-like tool (2) to an external thread (3) on a working spindle (4) driven about an axis of rotation (A), having an associated inner threaded part (5) and a manually displaceable tensioning means (6, 6′, 6″) for axial clamping and release of the inner threaded part (5) relative to the tool (2), wherein at least one flat spring (7) extending essentially parallel to the axis of rotation (A) is associated with the inner threaded part (5) on the tool side, by means of which the inner threaded part (5) can be axially resiliently tensioned with the tool (2).

Abstract: A novel, one-way nut fastener including a nut body with a side wall that is internally threaded and lobes that extend from the side wall of the nut body. Each lobe has a flat portion that extends substantially radially away from the side wall and a curved portion that extends from the flat portion to the flat portion of an adjacent lobe. A special tool uses the leverage that is gained from the flat portions of the lobes to tighten the cap threads onto the threads of a stem portion. Since the leverage gained from the lobes, which is used to tighten the nut fastener, cannot be used to loosen the fastener, it is much more difficult to remove the nut fastener.