Abstract: A pin is provided for repairing cracks in a material such as iron casting materials. The pin includes threads with both upper surfaces and lower surfaces which angle upwards toward a head of the pin. A tapping bit is utilized in a hole of similar diameter to the pin, positioned with half of the hole on each side of a crack, the bit creating threads in the hole which are substantially complemental to the threads of the pin. The pin includes a shoulder which has a greater diameter than a diameter of the hole. A neck is located between the head of the pin and the shoulder of the pin having a lesser diameter than any other portion of the pin. When the pin is threaded into the hole, the shoulder abuts against a surface of the cracked material causing the pin to cease translation into the material. Upon further rotation of the pin, the upwardly angled threads draw opposite sides of the crack towards each other.

Abstract: A variable stator vane includes an airfoil with an integral outer trunnion having a seat extending integrally therefrom. A threaded stem extends from the seat and includes a coextensive alignment surface that cooperates with a complementary mounting hole in a lever arm which restrains rotation of the lever arm about the stem during assembly for ensuring a predetermined rotational orientation between the lever arm and the airfoil.

Abstract: A threaded fastener with a shape memory alloy (SMA) coatings on its threads is disclosed. The fastener has special usefulness in high temperature applications where high reliability is important. The SMA coated fastener is threaded into or onto a mating threaded part at room temperature to produce a fastened object. The SMA coating is distorted during the assembly. At elevated temperatures the coating tries to recover its original shape and thereby exerts locking forces on the threads. When the fastened object is returned to room temperature the locking forces dissipate. Consequently the threaded fasteners can be readily disassembled at room temperature but remains securely fastened at high temperatures.A spray technique is disclosed as a particularly useful method of coating of threads of a fastener with a shape memory alloy.

Abstract: A self-drilling anchor installable in a wall by means of a screwdriver, the anchor being adapted to receive a threaded fastener serving to hold a fixture against the wall. The anchor includes an externally-threaded shank section having a head engageable by the screwdriver and a longitudinal bore threadably to receive the fastener. Integral with the shank section and extending axially therefrom is a drill section having at least one cutting member and guide means therefor, whereby as the anchor is turned in to the wall by a screwdriver, the cutting member then bores a round hole therein whose bank is engaged by the guide means to ensure circularity of the hole. And as the anchor continues to turn, the shank section enters and taps the hole until its head engages the outer surface of the wall to complete the anchor installation.

Abstract: A screw-threaded connection incorporates dual synchronized threads, that is, one connection element has a set of external male threads that mates with a corresponding set of internal female threads on the mating connection element, in customary fashion. The first connection element additionally includes a second set of internal female threads synchronized with the first set such that the leads of both sets of threads are the same. This second set of internal female threads mates with a corresponding set of external male threads on the mating connection element. Of course, the two sets of threads on the mating connection element are synchronized such that their leads are the same, and, of course, the same as first sets of mating dual synchronized threads. This dual synchronized thread connection has application to any fluid connector and particularly to fluid connectors in wide-variant temperature deviation, high-pressure, and/or mechanical vibration environments.

Abstract: A fastener is formed with an elongated threaded portion defined by a central shank and a thread formed on the shank, a neck collinear with the shank, and a head provided with a recess adapted to receive a tool for rotating the fastener. The shank of the threaded portion includes a cylindrical body and a tapered penetrating point extending longitudinally from the body. The thread is provided with a constant diameter section along the cylindrical body and a tapered section along the tapered penetrating point. The constant diameter section defines a major diameter that is more than about double the minor diameter defined by the body of the shank. The thread defines a pitch greater than the cross-sectional thickness of the thread along the shank so that the cylindrical shank is exposed within each pitch of the thread.

Abstract: The invention contemplates a fixation pin for retaining small bone fragments in an osteosynthesis procedure. The pin comprises a smooth-walled shank portion and an adjoining threaded portion, wherein a step-down conical shoulder is formed between the shank portion and the threaded portion.

Abstract: An assembly of housings is secured is secured together by a plurality of bolt members. The assembly is subject to a source of vibration, such as an internal combustion engine. To ensure the natural frequency of the bolt is outside the operating range of the engine, tolerance support rings are installed to reduce the effective length of the bolts and thereby increase the natural frequency.

Abstract: In a unit for mounting a primary insulator for power lines onto a pin, a threaded element has an inner diameter which decreases along the length of the threaded element from its top to bottom. The threaded element surrounds a portion of the pin, forming a gap defined by the outer peripheral surface of the pin and the inner diameter of the threaded element. An adhesive resinous material, such as epoxy, is permitted to cure within the gap and forms a strong bond with the pin, which may be metal or fiberglass. An interference fit, or interlock, is formed between the threaded element and the adhesive resinous material. The threaded element may be plastic, and a lubricating powder may be dispersed throughout the threaded element.

Abstract: An improved railroad frog bolt-nut assembly is disclosed. The bolt has a square head and a shank. The shank has an unthreaded portion adjacent the head and a threaded portion at its terminal end. The threaded portion is rolled to a diameter equal to the shank's unthreaded portion to produce high fastener strength. A unitary lock nut is formed with an annular boss extending from it's outside end in which indentations intersecting with some of the nut threads are pressed to provide an interference, locking fit with the bolt threads.

Abstract: Fasteners composed of a composite material constituted by a ceramic matrix reinforced with refractory fibers for use in the assembling and dissembling of structures likely to be subjected to high temperatures. The fasteners, which can comprise screws, nuts and bolts, can include a threaded rod, possibly comprising a head, and at least one nut cooperating with the rod. The threads of the rod and the nut are round threads. Further, the male and female portions of the threads have the same theoretical profile to within machining tolerance and functional clearance.

Abstract: Bone screws are disclosed with and without heads and with the screw shaft provided with axially adjacent longitudinally extending regions, one or more of which have bone ingrowth porous surfaces and alternate with regions having threaded surfaces. The headed embodiments have a region with a threaded surface nearest the head.

Abstract: A spiral member for improving the grip of screws in wooden or other receptive substrates is disclosed. The spiral member has a central axial drive pin by which it can be driven into a thread in the receptive substrate, and it has an improved cross section providing wings or protuberances extending out past the side surfaces of the cross section. The spiral member also has an outwardly facing triangular apex which bites into the old thread while the wings bear upon the flanks of the screw thread of the screw that inserted into the spiral member, thereby improving the grip.

Abstract: An arresting device for force-transmitting fixing of two relatively movable parts, particularly for cutting angle or cutting depth adjustment of electric hand saws, the arresting device has a pin having a radially extending pressing surface for pressing against one of the parts, a clamping element having a pressing surface for pressing against another of the parts and arranged on the pin so that by a relative turning of the clamping element and the pin the pressing surfaces are moved toward one another for producing a clamping and from one another for releasing the clamping. The clamping element is formed as a hand lever having a clamping sleeve and a lever arm extending from the clamping sleeve. The clamping sleeve is turnably arranged on the pin and has a clamping collar extending over the lever arm and provided with a ring-shaped end surface forming the pressing surface of the clamping element.

Abstract: The improved metal matrix bolt has a metal shell having the bolt head, shank and threads thereon. The shell has a longitudinal space therein wherein a composite core of fibers is bonded. The fibers are divided into two groups: a longitudinal group and a spiral group. The spiral group wraps clockwise about the longitudinal group and is inclined at an angle of about 30.degree. to 45.degree. degrees from the axis of the bolt. The fibers are bonded within the space to the interior surface of the shell whereby when the bolt is torqued, the bolt has increased tensile strength and reduced thermal axial growth.

Abstract: A fastener assembly to be used in the construction of semi-trailers consisting of a first fastener having a head and a shank, a mating second fastener, and a plurality of radially spaced projecting barbs formed on the shank. The barbs, which may also be spaced axially on the shank, engage in a hole for receiving the first fastener to prevent rotation and removal of the first fastener. The first fastener may also be provided with an encapsulating cover with two sealing points on its underside to seal the fastener to a surface through which the fastener is inserted.

Abstract: A method and apparatus for patching a hole in a panel without the use of a bonding agent or the aid of a welding apparatus. The method encompasses the placing of a patch within the confines of a hole. The patch is of a configuration which is within a close tolerance of the hole and of the same thickness as the thickness of the panel. This provides a flush inside surface and a flush outside surface upon the completion of the repair. The patch is temporarily secured with supports and bores are drilled around the periphery of the patch which communicate with both the patch and the panel. These bores are tapped to accommodate a segmented threaded rod. The depth or thickness of each threaded segment is almost equivalent to the thickness of the panel. The segmented threaded rod is threaded into the hole until it is flush with the inside surface. Each consecutive segment is separated by a core.

Abstract: A fastener has multiple secondary threads intertwined with a primary thread installable in a thermoplastic workpiece. A method and die are arranged for fabricating such a fastener. The fastener comprises a threaded shank portion having a primary thread of a desired form and a driver head attached thereto. At least one secondary thread is intertwined with the primary thread. In accordance with one embodiment of the invention, an outer surface of the fastener may be heated to a preselected Curie temperature during the installation of the fastener into a workpiece. The preselected Curie temperature enhances the flow of the thermoplastic material around the fastener while the fastener is being installed in the workpiece. A coating material having a particular desired Curie temperature may be applied to the fastener to produce desired driving characteristics.

Abstract: High tensile and torque strength threads are provided on a thermoplastic composite rod by first cutting a thread at a relatively short pitch into an end of the rod. Thermoplastic composite tape is then wound in tight conformance to the cut thread so that the fibers of the tape align with the desired helix angle of the thread to be created. The rod and the tape are heated at their junction to above melt temperatures during the winding process to increase adhesion between the rod and the tape. While the end of the rod and the wound tape are at above melt temperatures, the end of the rod and the tape are compressed in a die conforming to the desired ultimate configuration of the thread. The tape and rod are then permitted to cool until sufficiently hardened to permit release of the compressing die without deformation of the threaded end of the tape. The result is a thermoplastic composite rod having high tensile and torque strength at its threaded end.

Abstract: A connecting device connects a tailpipe to an exhaust pipe of an internal combustion engine for a vehicle. The tailpipe includes a smaller diameter section and a larger diameter section, and the free end of the exhaust pipe is received by the larger diameter section of the tailpipe. An annular space separates the larger diameter section of the tailpipe and the free end of the exhaust pipe. Screw threads are formed on the free end of the exhaust pipe. A connecting spring is configured as a conical helical spring, the larger diameter end of which is fixed to the tailpipe. The other end of the spring has coils configured as screw threads which screwed onto the screw threads which are formed on the free end of the exhaust pipe. The spring is relatively soft in a direction parallel to an axis of the tailpipe, and is relatively stiff in a direction transverse to an axis of the tailpipe. The spring absorbs vibrations of the engine and centers the pipes with respect to each other.

Abstract: Disclosed is a bolt which comprises a short column portion formed at the extreme end of the thread portion thereof, wherein the short column portion has a diameter larger than the root diameter of the thread portion and smaller than the thread diameter thereof and the extreme end thereof is formed to a spherical portion and a method of manufacturing the bolt by which a thread portion and a spherical surface portion are simultaneously rolled. The bolt arranged as described above has an excellent guide property to a nut.

Abstract: A connector housing in which a pair of male and female connector housings are united together by tightening a bolt provided through a seal member on one of the male and female housings with a nut provided on the other one of the male and female housings, includes an externally-threaded portion formed on the bolt from its tip end by a predetermined length. A non-threaded portion is formed on the bolt, extending from the externally-threaded portion and having a diameter smaller than the externally threaded portion so that when the male and female connector housings are fittingly connected together completely, threaded engagement of the externally-threaded portion with the nut is released and the nut is disposed around the non-threaded portion. A pressing and retaining device presses and retains the bolt in a direction to contact the externally-threaded portion with the nut when the male and female connector housings are fittingly connected together completely.

Abstract: An improved temporary support pin which may be pushed into place rather than screwed into place and used with either English or metric threads. Resilient arms protruding from the support pin are depressed when a workpiece is pushed over them, and spring back into place to support the workpiece and allow a mechanic to have both hands free for replacing screws which attach the workpiece to its permanent mounting. The embodiment further includes a non-circular cross-section at the end gripped by the mechanic, to permit easy gripping, insertion, turning, and removal of the pin. The improved pin is preferably manufactured in one-step molding, significantly reducing the cost of its manufacture.

Abstract: A tightening member molded from hard synthetic resin containing carbon fiber developed from hyperfine particles of a high-melting metal and/or a compound of the high-melting metal by use of vapor phase system for thermally decomposing hydrocarbon. The tightening member effectively prevents electrification of static electricity due to its high conductivity given by the carbon fiber and is bestowed with mechanical properties such as tensile strength.

Abstract: A carbon and/or ceramic fiber reinforced carbon and/or ceramic matrix composite threaded member including a core, a fiber containing thread-defining element bonded to the exterior of the core and a reinforcing fabric layer securing the thread-defining element to the core. The thread-defining element may be an integral part of a tubular braided reinforcing fabric or applied to the core prior to application of a reinforcing fabric layer. Externally and internally threaded members and methods for their manufacture are described.

Abstract: A threaded member including a core, a thread-defining element helically extending around and along the core and a reinforcing tubular fabric layer bonded to the exterior surface of the combined core and thread-defining element. The radial projection of the thread-defining element defines a helical thread whose contour is followed by the fabric layer and the exterior surface of the threaded member. The composite threaded member may be formed by forming a braided or knit fabric layer on an elongated spiral wrapped core. The spiral wrapped thread-defining element and the fabric reinforcing layer is bonded to the core. A polymer sheath protects the underlying structure.

Abstract: Camber adjustment assembly for adjustably and securely positioning a wheel within a vehicular suspension system utilizing a generally vertically arranged support strut with the lower end of the strut being provided with a generally "U"-shaped bracket secured fast thereupon. The bracket is typically provided with two vertically spaced apart bore pairs for receiving through-bolts therethrough, and for retaining the knuckle assembly therewithin. The camber adjustment assembly includes an eccentric bolt having an eccentric segment between the head portion and the distal portion, with the eccentric segment being designed to be retained within either the upper or lower series of bores formed in the knuckle assembly.

Abstract: A structure which is of the utmost simplicity, rigidity and reliability has a transmission arrangement (1) for converting the rotary movement of a motor into a linear movement of a driven body (21) along a curved path. It is of a configuration that includes a stationarily arranged spindle (2) which is curved to correspond to the shape of the curved path, and at least one thread counterpart portion (4) which is engaged with the thread of the curved spindle and which is rotatable about the spindle, and by virtue of that rotary movement, displaceable in the longitudinal direction of the spindle. The stator (14) of the motor is connected to the driven body and is mounted non-rotatably and longitudinally displaceably with respect to the curved spindle, and the rotor (5, 15) of the motor is non-rotatably connected to the thread counterpart portion.

Abstract: A composite fastener which provides up to 70 KSI in shear strength in a 1/4 inch shank diameter and includes several layers having long parallel carbon fibers embedded in resin. The layers are pressed together and heated to form a panel. The panel is cut into bars which are then machined into rods, used to form threaded or unthreaded composite shear pins. The fibers in adjacent layers are angled with respect to one another to provide maximum shear strength in a particular direction. The head of the shear pin is preferably marked to indicate the orientation of maximum shear strength.

Abstract: An article retention arrangement utilizing a drive-in expansion fastener having a generally cylindrical, hollow body with a tapered end formed from an angular truncation of the body. The body is reinforced by one longitudinal rib so as to permit drive-in penetration from the tapered end even if the fastener is formed from plastic materials. The fastener is retained within the wall by at least one pair of hinged flanges which expand circumferentially in response to the installation of an insertion element within the hollow portion of the body. The insertion element engages an inclined surface within the body to cam the expansion flanges circumferentially outward. The expansion flanges engage the back surface of the wall while the longitudinally slit portion of the body expands within the hole created by drive-in penetration. The insertion element preferably includes an enlarged head projecting from the fastener when the insertion element is fully installed within the fastener.

Abstract: Fasteners and fastening devices made of metals, metal alloys, hard high strength ceramic material and the combination of same, are provided wherein all, a select portion or portions of the fasteners are coated with a thin layer or film of synthetic diamond material which is operable to enhance their strength and surface characteristics, insulating ability and resistance to heat and chemical corrosion attack. In one form, a machine screw is totally coated with a thin layer or film of synthetic diamond material. In another form, a select portion of the fastener is so coated. A thin coating of chromium or other suitable solid material is deposited on the outer surface of the diamond coating to protect same against physical attrition during its application and use. In another form, just the threads of machine screws and the like are diamond coated to protect same against corrosion.

Abstract: A threaded member including a core having an integral tubular braided layer bonded to the exterior surface of the core. The braided layer includes at least one element of greater radial projection which defines a helical thread on the exterior surface of the core. The composite threaded member may be formed by forming a braided layer on an elongated core. The braided layer includes at least one element of greater radial projection relative to the core than the remainder of the elements forming the braided layer. The element of greater radial projection defines a helical thread on the core. The braided layer is bonded to the core.

Abstract: A hollow composite internally threaded member such as a nut includes a reinforcing fabric layer such as a braided or knit layer extending in the axial direction of the member and conforming to its threads and an exterior cross-sectional configuration defined by a tubular braided triaxial fabric having axially extending elements of greater size than the remainder of the elements forming the triaxial fabric. A method of making such an internally threaded member comprises forming and embedding in a mtrix at least one reinforcing fabric layer and one triaxial fabric layer on an externally threaded cylindrical core and thereafter removing the core. Such internally threaded member may be threadedly joined and bonded to an externally threaded member of complementary thread pitch and thread diameter to form a bolt. The externally threaded member may comprise an elongate core having an integral tubular fabric layer bonded to its exterior surface.

Abstract: An aerospace fastener comprises a blot with a roll-formed thread, and a nut with a similar thread having a uniform pitch P. The bolt has a cylindrical shank, a threaded tip and a run-out zone between the shank and tip. The thread root in the run-out follows a smooth S-shaped curve with the concave portion preferably having a radius in the range of from 2P to 2.7P. The run-out extends from 1.4P to 2.3P from the maximum grip plane of the bolt, and preferably extends from 1.6P to 2P from the maximum grip plane. The root of the thread in the run-out lies within an envelope defined by boundaries which take into account the maximum and minimum material conditions of the bolt. The nut has a run-in truncating the crest of the nut thread complementary to the run-out to clear the root of the bolt thread when the nut is assembled on the bolt in the minimum grip condition.

Abstract: In interconnecting construction between a bolt and a mounting plate such as a shell of a brake booster is disclosed. A sealing, annular projection is formed in an end face of a bolt head so as to surround a bolt shank which is formed with a serration. Both the annular projection and the serration are caused to bite into the opposite surfaces of the mounting plate, whereby an excellent sealing effect and locking action against rotation are simultaneously achieved.

Abstract: A threaded fastener has a pin with a head, a cylindrical shank, a shoulder with reducing diameter, a radius at the least diameter of the shoulder whose region is work-hardened, and a threaded end, in that order. The thread extends into near-adjacency to the shoulder, and has no more than approximately one-half of a convolution of an incomplete thread at its end adjacent to the shoulder. A collar is threadable onto the thread. It has a counterbore no longer than the anticipated grip range plus approximately one-half of a thread pitch. The collar may be inherently torque-limited. The term "thread" also includes a peripheral groove.

Abstract: A fuel assembly has a top nozzle with improved clamps for retaining hold-down spring assemblies. Each clamp includes a clamp block formed integral with a flange of the top nozzle at each of a pair of diagonal corners thereof. Each clamp block has a pair of interconnected clamp slots formed therein. Each clamp slot is formed in the clamp block with interconnected openings at the front and outer side thereof. The front and outer side openings permit sideways insertion of the hold-down spring assembly at a base end thereof to position the spring assembly for attachment to the top nozzle. The clamp slot also provides a flat bottom surface in the clamp block for clamping the hold-down spring assembly.

Abstract: An aerospace fastener comprises a bolt with a roll-formed thread, and a nut with a similar thread having a uniform pitch P. The bolt has a cylindrical shank, a threaded tip and a run-out zone between the shank and tip. The thread root in the run-out follows a concave curve having a radius in the range of from 2.0P to 2.7P and extends 1.58P to 1.8P from the maximum grip plane of the bolt. The nut has a convexly curved run-in truncating the crest of the nut thread complementary to the run-out to clear the root of the bolt thread when the nut is assembled on the bolt in the minimum grip condition. This permits the nut to be assembled on the bolt further than in a conventional combination, and shortening of the nut and bolt by at least 1P to save weight.

Abstract: The present invention comprises an improved mounting device incorporating two set screws acting upon two separate axially spaced-apart conical portions of an anchor bolt to produce a lateral "wedging" force which anchors the door handle securely in place against the door stile. The anchor bolt is secured in a hole drilled in the door by turning the threaded shank of the bolt into an internally-threaded rivet set into the hole. A door pull is inserted over the anchor bolt through a bore in the door pull, and a counter bore fits over the flange of the internally-threaded rivet to permit the door pull to bear directly against the door stile. As the two set screws are tightened into threaded holes in the bottom of the door pull, the beveled tips of the set screws bear on the conical surfaces of the anchor bolt, creating a lateral wedging force which moves the door pull toward and against the door stile.

Abstract: An elongated, generally cylindrical fastener engagable with a retaining ring to secure the fastener to a panel. The fastener includes a first set of uniformly-spaced splines extending along its external surface and terminating at an end of the fastener opposite an enlarged head. A second set of longitudinal splines is interleaved with the first set, these second splines being closed at their opposite ends. A separate crossover slot connects together each associated pair of open-end and closed-end splines. A retaining ring having inwardly-projecting tabs is slid onto the fastener with its tabs engaging the first set of open-end splines and the retaining ring is thereafter rotated to slide the tabs across the crossover slots to the closed-end splines. The depth of the crossover slots is less than the depth of the closed-end splines, such that the retaining ring must expand or flex outwardly when the tabs are slid across the slots.

Abstract: A threaded fastener is made of a composite material made of layers extending parallel to the fastener axis and having elongated filament fibers. A portion of the fibers extend parallel to the axis of the fastener to provide tensile and shear strength to the fastener, and a portion of the fibers extend parallel to the load-bearing thread faces to enhance tensile strength to the threads.

Abstract: A fastening member to be driven into a hard receiving material, such as concrete, masonry, rock and the like, has an axially extending shank with a drilling head at its leading end and a thread adjacent its trailing end for connecting a load to the fastening member. A device is located on the shank for engagement with a tool for driving the fastening member into the receiving material. Initially, the fastening member drills a blind bore into the receiving material and then an explosive powder charge drives the member into its final position.

Abstract: This invention relates to an improved captive screw and assembly, and particularly a screw which may be held loosely captive in the threaded hole of a support member. The invention comprises a machine screw or cold formed fastener with an unthreaded interrupted mid-section that separates two spaced-apart threaded portions of the fastener, with both threaded portions of the fastener preferably of a similar thread size, and with the unthreaded mid-section of the screw of a diameter less than the root diameter of the threaded sections. The screw may be completely removed or readily installed into threaded engagement with a female threaded hole in the support member, when necessary, by first manually aligning the fastener axis with the axis of the threaded hole, then rotating the fastener to engage the starting threads of the fastener with those of the female threaded hole, and further continued rotating of the fastener in a conventional manner. The fastener may clamp a panel member to the support member.

Abstract: An essentially cylindrical, light weight, composite fastener formed of an interior cylindrical core member, a cone-shaped molded insert plug member in the first or head end of the core, and an exterior cup-shaped overwrap member. Threads are formed at the second or threaded end of the fastener. All of the components are fabricated of an organic resin material with high-modulus fibers embedded therein. The fibers of the exterior member are long and continuous while the fibers of the other members are short and chopped. All the fibers are essentially parallel with the axis of the fastener. The resin material is preferably polyetheretherketone and the fibers are preferably graphite. Also disclosed is the method of manufacturing the above described fastener.

Abstract: A sectional sickle bar is provided. The sickle bar includes a plurality of elongated bar segments and means for releasably joining adjacent joining ends of adjacent bar segments. The joining means includes a special section and at least three fasteners. Each fastener includes a bolt, a nut and reciprocal thread means for screwing the nut onto the bolt. Adjacent joining ends of adjacent bar segments are joined together by the fasteners and the special section to form a lap joint. In a preferred embodiment, a special fastener having an oblong shank is provided. Preferably, the fastener has an offset threaded end portion for receiving a reciprocally threaded nut.

Abstract: A method of forming a lightweight threaded fastener element of bimaterial construction to high tolerance requirements, the element formed by the steps of shaping a metal shell to a preliminary configuration blank by extrusion, filling the extruded shell with a less dense material such as a curable epoxy-graphite material or an aluminum-lithium alloy, further shaping the filled blank by forging both the core material and shell to an intermediate configuration which is finished by warm rolling to form a strong lightweight fastener element configured with the metal shell thereof which may be engageable with a cooperating metal fastener assembly member.

Abstract: A tubular connection is disclosed having a small diameter thread set and a large diameter thread set, the small thread set having a lesser number of threads than the large set. A primary torque shoulder is located between the threads sets and a secondary torque shoulder is located behind the large thread set. In the preferred embodiment, the initial partial thread on the pin of both sets and the last partial thread of the small set on the box has a cylindrical root contour, whereas the remainder of the threads are tapered. The longitudinal taper angle of the pin thread sets are dissimilar to the box thread sets, there being a maximum separation of the sets near the center of the connection. Such dissimilar tapering tends to equalize the stress applied to the threads under tension loading. At the center, a seal is provided with hooked threads on either side thereof. The arrangement also provides a torque shoulder at either end of the large thread set.

Abstract: An existing bolt on certain V-8 engines near and laterally inwardly of the engine fuel pump is aligned with the fuel pump push rod driven by the engine cam shaft. When installing a new fuel pump, the existing bolt is removed and a push rod holding screw of sufficient length to engage and hold the fuel pump push rod is temporarily installed in the threaded opening previously accommodating the removed bolt. The holding screw is turned manually until it engages the fuel pump push rod to hold the push rod elevated while the fuel pump is being installed. The procedure assures that the push rod will be in proper operative engagement with the fuel pump arm when the fuel pump installation is completed, following which the push rod holding screw is removed and the bolt is reinstalled in the threaded opening of the engine block. Haphazard and unreliable methods of holding the push rod up during the fuel pump installation with table knives, screwdrivers and a variety of crude tools are fully avoided.

Abstract: A method for aligning bearing covers at bearing sections of a crankcase in which bearing covers of a crankshaft bearing are aligned by way of fastening bolts and subsequently machined-in fitting pins and wherein the bearing bore for the crankshaft is subsequently machined. Thereafter, the crankshaft is assembled whereby the bearing cover is at first aligned by the fitting pins and is then fixed by means of the fastening bolts. Not only a secure support of the bearing cover at the bearing sections is assured thereby, but also narrow tolerances which favorably influence the bearing support of the crankshaft, can be maintained without problem.

Abstract: Disclosed is a mechanically lockable fastener assembly for maintaining workpieces assembled, when an elongated bolt with threads formed along a length thereof, and substantially axially aligned rotation resisting surfaces formed along another length thereof, is mechanically assembled with a cooperating nut having a threaded portion and a compressible portion deformable into engagement with said rotation resisting surfaces of said bolt to cause the bolt and the nut of the assembly to be inseparable by untorqued unthreading.