Abstract: An optical lens securer device for spectacles which includes at least an optical lens having a through slot and a spectacle frame having a coupling portion. The optical lens securer device includes a locking holder and a locking member. The locking holder, having a locking groove defining therethrough, is extended from the coupling portion of the spectacle frame, wherein the locking holder is mounted on the optical lens at a position that the locking groove is aligned with the through slot. The locking member includes a holding base and a locking arm extended therefrom to securely insert into the locking groove through the through slot so as to fasten the optical lens between the holding base and the locking holder for securely attaching the spectacle frame to the optical lens.

Abstract: A coupling system for securing a one-piece lens to temples includes a pair of temples, a one-piece lens and a pair of marking blocks. Each temple has a cavity in the outer surface of the front head, a through hole is provided in each cavity, a room is formed in each front head, and each room has a rear end portion. The one-piece lens has both inserting ends, and a hole is provided near each inserting end. Each marking block is made to be a certain configuration, an inserting hook is provided at the rear of each marking block, the bottom end of each inserting hook has a stopping member, and marks or characters may be provided on the front surface of each marking block.

Abstract: A spectacle lens holding structure comprises a spectacle lens having a indent on side of connecting temple wherein the horizontal inside of indent has a positional strip, and vertical side of positional strip includes a fastening gibbous object; and a holding member having a first opening for placing the spectacle lens and a second opening for connecting a hinge of the temple wherein the holding member has a channel passed through the first and second opening for placing the positional strip and can fasten the spectacle by the fastening gibbous object of the positional strip. The spectacle lens holding structure is easy to disassemble without any tools.

Abstract: This side shield retention clamp for locking an eyeglass side shield having a side hole to a temple of an eyeglass frame has a temple clamp with an arm extending therefrom having a hole rather than a hook at its end. A screw extends through the hole, but is not tapped into the hole. Instead, a threaded shield clamping nut extends into the hole in the side shield from the inside of the shield. This screw is threaded through this shield clamping nut and contacts the temple. In contrast to this, the screw tightening the temple clamp engages the clamp directly rather than pressing against the temple. In the preferred embodiment, the shield clamping nut has a projection with a flat face that fits against the outside of the temple, extends into the clamp slot, and is clamped against the temple when the clamp is tightened (via a clamp screw).

Abstract: A coupling system for securing a one-piece lens to temples includes a pair of temples, a one-piece lens and a pair of marking blocks. Each temple has a cavity in the outer surface of the front head, a through hole is provided in each cavity, a room is formed in each front head, and each room has a rear end portion. The one-piece lens has both inserting ends, and a hole is provided near each inserting end. Each marking block is made to be a certain configuration, an inserting hook is provided at the rear of each marking block, the bottom end of each inserting hook has a stopping member, and marks or characters may be provided on the front surface of each marking block.

Abstract: This is a configurable eyewear system that has at least one temple member, at one lens and a pair of mating members, and a connector. The at least one temple member and the at least one lens are rotatably connected by coupling the at least one first mating member and said at least one second mating member with the connector. The invention also has at least one containment structure and at least one lens that is rotatable within the containment structure. The invention further includes an eyewear lens that has a rotator and an eyewear lens that has an anchor cut-out. In addition, the invention includes an eyewear lens, that has at least a first prescription, an interior side and an exterior side on flip sides of the lens, wherein the viewing effect of the first prescription exists from the interior side and from the exterior side.

Abstract: Disclosed is a lens fastening device for frameless spectacles. The lens fastening device comprises a first fastening element made of soft synthetic resin, possessing a guide part formed at a lower end thereof, defined with a threaded hole and having a tapered part to be decreased in its diameter toward an upper end thereof, and a second fastening element prepared separately from and coupled to the first fastening element, made of metal or hard synthetic resin, possessing a flange part formed on an outer surface and at an upper end thereof, defined with a threaded groove and an engagement groove into which the guide part of the first fastening element is engaged, and having a body part.

Abstract: A spectacle lens (2) has a first through-hole (22) into which a stud (16) formed in an end piece. The first through-hole (22) and the stud (16) have corresponding non-circular cross-sectional profiles. In the stud and in a contact portion of the end piece, a second through-hole (18) is formed, with a pin (24) being inserted therein, the pin having a head (28) which, with its lower side, abuts on the spectacle lens (2) on the side thereof facing away from the contact portion (10).

Abstract: A one-piece lens and frame assembly includes a spectacle frame, a one-piece lens and a catching member. The frame is provided with a top hollow and a bottom hollow in the bridge, and a flanged block is provided in each hollow. The one-piece lens has a nose-pad cutout portion in the bottom, and the top and bottom edges of the lens bridge are respectively provided with a notch. Each end of the catching member is bent inward to be a hook portion, each hook portion is provided with a through hole, and an interior room is formed between both hook portions. After the lens bridge being attached to the frame bridge, both hook portions are successively inlaid in both hollows of the frame bridge so as for both flanged blocks to be firmly caught in the through holes.

Abstract: An auxiliary eyeglass is mounted frontwardly on a primary eyeglass having a primary bridge interconnecting two primary lenses. The auxiliary eyeglass includes two auxiliary lenses disposed frontwardly of and aligned with the primary lenses respectively. A coupling unit includes a hook member hooked on the primary bridge, a first threaded unit extending in a transverse direction relative to the primary bridge and the hook member and selectively connected to one of the hook member and the auxiliary lenses, and a mounting unit selectively connected to the other one of the hook member and the auxiliary lenses with the first threaded unit extending through the mounting unit. A second threaded unit is mounted threadedly on the first threaded unit and adjustably abuts against two opposite sides of the mounting unit so as to permit adjustment and positioning of the auxiliary lenses relative to the primary lenses.

Abstract: Safety eyewear is presented which is provided with particulate sealing around the inside periphery of the lens/lenses and having temples that provide adjustment of the eyewear to a pantoscopic angle. The eyewear is provided with an adjustable strap assembly for better fit to the wearer's head. The eyewear lens/frame includes a plurality of projections that define various pantoscopic angles. The temple end piece includes a set of recesses that engage the projections formed on the lens/frame which temple end piece is rotated relative to the lens/frame to set the pantoscopic angle. The adjustable strap assembly further adjust the fit of the eyewear and can be unbuckled for snaplocked attachment of the eyewear directly to other safety equipment such as noise suppression ear muffs, communication head phones, breathing masks and the like.

Abstract: Apparatus for facilitating and improving vision, and specifically reading or near vision. The apparatus is configured for facilitating vision from one eye of a user. The apparatus includes a lens coupled to a holding mechanism. The lens is formed of a size, shape and power that improves a substantially complete area of vision from the one eye when provided close to the one eye. The holding mechanism includes a first portion adapted to be coupled to or to hold the lens. The holding mechanism includes a second portion that is adapted for being held between two fingers of the user. The holding mechanism second portion can be formed with an aperture, for attaching to another object. The present invention provides a convenient, small, and personal apparatus for facilitating vision in situations where such vision could be impaired.

Abstract: Spectacles with bored frames are defined. The spectacles have lenses joined directly to the bridge and the tenon hinge of the temple by assembly points provided directly on the lenses. The assembly points, at the end of the bridge or the tenon hinge of a temple, have a tab cut out from the lens, projecting beyond the contour of the lens, and an assembly member on the end of the bridge or the tenon hinge of a temple forming a recess, open on one side, to receive the tab by means of a form fit and to be joined thereto.

Abstract: An eyeglass assembly and a method for converting a non-magnetic primary eyeglass frame to a magnetic eyeglass frame and for attaching an auxiliary eyeglass frame to the primary frame include the non-magnetic primary frame, a magnetic auxiliary frame, and a removable magnetic connector. The non-magnetic frame utilizes two non-magnetic lens screws to hold a lens pair and two non-magnetic temple screws to pivotably hold temples. The auxiliary frame has at least one magnetic member. The removable magnetic connector replaces at least one of the non-magnetic lens or temple screws. Thus, the non-magnetic frame is converted to a magnetic frame able to hold the magnetic auxiliary frame thereon. The removable magnetic connector can be a screw having a magnetic portion or an assembly including a screw and a magnetic attachment that is held on the primary frame by the screw, which can be one of the existing lens or temple screws.

Abstract: In a positive-locking connection between a metallic bridge and a moulded article which is injection-moulded from plastic, in particular for spectacles, one end of the bridge engages in the moulded article. In order to provide advantageous constructional conditions, it is proposed that the moulded article form a plug-in receiving means with the engaging end of the bridge which is provided with a wave-like snap-in profiling and can be inserted into the plug-in receiving means under a substantially elastic deformation of a wall profiling of the receiving means which is shaped according to the snap-in profiling of the bridge end.

Abstract: To generate elastic force in temples and to hold a head with pressing force generated by this elastic force so as to make eyeglasses fit more comfortably. An end of an endpiece to be mounted to a lens is bent, and an endpiece part in a polygonal shape is rotatably mounted to the end. A central portion of the endpiece is pressed against one side of the endpiece part in a normal state. An end of the temple in contact with a user's head is fixed to the endpiece part. As the temple is opened, the endpiece part rotates and the one side then turns from the state of being in contact with the central portion of the endpiece, generating working force so as to return to the initial state and then generating the elastic force in the temple thereby.

Abstract: A device (10) for clamping a lens (11) to a spectacle frame (12) comprises a bridge (16), which is rotatable about a pin (19) fixed to the body of the frontal frame or to the nose pad carrying element of the spectacle, said bridge being provided with two opposite ends relative to said pin, of which: a first end (27) is provided with a thread suitable for cooperating with a screw (26) which is suitable for causing the rotation movement of the bridge about said pin; and the second end (28) directly cooperates with the lens, by exerting a force on the surface of said lens, said force keeping the lens pressed against a conjugate element (22, 24) which is present on the body of the frontal frame and/or of the nose pad carrying element.

Abstract: The invention concerns a device a fixing member associated with the hinge element and anchored by overmoulding in a frame bow or front flank obtained by moulding. Said fixing member comprises a first plate bearing the hinge element, or the housing, and which via a central bridge is linked to a second plate extending substantially parallel to the first. The central bridge extends transversely in said bow or front flank while being completely embedded in the moulded material of said bow or front flank. The second plate projects outside the outer surface of the bow and of the front flank and has a surface forming an ornament.

Abstract: A face mask is provided with buckles, each of the buckles including a first support member and a second support member. A head strap is guided and folded back by the first support member. A spring extending in a width direction of the head strap is inserted from the front or the lateral side of the face mask into a space defined between distal ends of the first and second support members.

Abstract: The invention is an improved connection of ear upholders for integrally molded arch eyeglasses comprising a lens and a frame. The connection ends of the ear upholders form curved hooks. When the ear upholders are unfolded prior to wearing the eyeglasses, the hook rim of the connection end will gradually reach against a lateral rim of the eyeglasses frame. When the angle for unfolding the ear upholders is limited to a direction perpendicular to the eyeglasses frame, users may unfold the ear upholders and fix them in the preset right angle automatically without adjusting the positions of the ear upholders.

Abstract: A magnetic coupling system for securing a temple to an eyeglass hinge includes a pivotal flange on the rear end of the eyeglass hinge and one clipping structure formed on the front end of the temple. One coupling magnet is provided in the pivotal flange of the eyeglass hinge. The clipping structure includes a pair of opposed pivotal flanges spaced one from the other to capture the pivotal flange of the eyeglass hinge therebetween and two magnets respectively secured in the pair of opposed pivotal flanges for respective magnetic coupling to the coupling magnet in the pivotal flange of the eyeglass hinge. Therefore, the temple is pivotally coupled to the eyeglass hinge in a magnetically reinforced manner.

Abstract: A method for securing two or more spectacle members together includes forming an orifice and an opening in one of the spectacle members, the opening of the spectacle frame may have an open or enclosed structure, forming an extension and a projection on the other spectacle member and engaging the extension and the projection into the orifice and the opening of the spectacle member. The extension or the projection is then melted or deformed to engage with the other spectacle member and to secure the spectacle members together. The spectacle members may be the lenses, the bridge or the temples. The spectacle members may be easily and quickly secured together without fasteners.

Abstract: A decorative eyeglasses fame includes a front composed of a first part and a second part between which a lens member is clamped, and two temples respectively connected to the second part. The second part has two connection blocks on two ends thereof and the lens member has two recesses in two ends so that the two connection blocks are engaged with the two recesses of the lens member. The two parts of the front and the two temples are made of foam material so that different shapes and colors can be conveniently made.

Abstract: A temple, for eyeglasses, comprising at least one rigid support which is associated with a front and with which at least one softer element, suitable to act as a hinge, is in turn associated.

Abstract: A pair of eyeglasses capable of maintaining the curve of an eyeglass main body even if temples are opened excessively wherein the temples do not pinch the head of a user to otherwise make the eyeglasses uncomfortable to wear even if the eyeglass main body is curved more sharply. The eyeglasses comprise a pair of left and right temples attached to left and right sides of an eyeglass main body through temple attachment members having a fork shape consisting of a fixed part fixedly attached to the eyeglass main body and a rocking part to which one end of each of the temples is attached.

Abstract: A goggle frame with quick fitting sides includes comprised of a conformation (1) joint to a goggle frame (2), basically composed by two horizontal and parallel plans (3) structured by a cross front-vertical blade (4), by a narrow side with elongated superior profile (5) and by a thin blade (6), with said profile (5) receiving the fitting of side (7) which trespass the hole where the transparent lens will be fitted, which end is provided with a reinforced conformation (8) and with an edge (9) to its fitting slightly inwards which, with the lens replacement, prevents the eventual escape and the fall of the goggles, said blade (6) operating as rotating limiter and preventing that the sides open more than the desired angle, which development has as purpose to make very easier the process of assembly and even the exchange of broken sides in the goggles frame, making them fully dismountable, particularly those used as safety equipment in manufacturing plants and similar.

Abstract: A locking block screw connection provides material-elastic protection against loosening of the screw by a novel configuration of the connection zone, where a bore and a screw are engaged. The bore is provided with a circular taper at the thread runout. The screw has a pin continuation where an annular groove is provided. When the screw is screwed into the bore, the taper of the bore is elastically deformed until the taper engages in the groove of the screw. The engagement between the taper and the groove provides an axial security against loosening of the screw.

Abstract: Spectacles with an improved fastening of spectacle lenses on a rimless spectacle mount have a spectacle lens which is secured to the spectacle mount with at least one filament which partially encloses the periphery of the spectacle lens. The spectacle lens is provided with at least one through-opening for the filament. The filament is guided through the through-opening and has a thickened portion behind and/or in front of the spectacle lens. The thickened portion is thicker than the width of the through-opening. The filament is wound around the spectacle mount at least once.

Abstract: A device for connecting monolithic tinted lenses on a bridge of a pair of corrective eyeglasses, consisting of a first body which has first and second elements for temporary engagement at at least one seat formed on the lens and to the bridge. A second body is also provided which allows to temporarily lock the position of the first body on the lens.

Abstract: A pair of eyeglasses of the type which comprises a front which is constituted by lenses with which temples are associated. The eyeglasses are characterized in that each one of the temples comprises an anchoring end section which is shaped so as to form an elastic clip which can be detachably fixed, in a snap-together manner, in a preset seat formed in an outer end region of the corresponding lens.

Abstract: A pair of glasses including two outer butts, two inner butts, a bridge and two movable rim assemblies. Each outer butt has two stopper plates each being formed with a longitudinal channel in which the movable rim assembly is inserted. Each inner butt also has a longitudinal channel in which the movable rim assembly is inserted. By means of the longitudinal channels of the stopper plates of the outer butts and the longitudinal channels of the inner butts, the upper or lower rims of the movable rim assemblies can be fixed with the lenses. Therefore, the glasses can be changed between full rim pattern, upper half rim pattern, lower half rim pattern and rimless pattern.

Abstract: This invention relates to a hinge structure in a frame of spectacles, wherein a bearing member having a pair of shaft insertion portions is mounted to a lens frame, a bifurcate member having shaft portions is fixed to an end of a temple to be in parallel with the temple, the shaft portions are respectively inserted into the shaft insertion portions such that the bifurcate member is horizontally movable, and a release prevention member is interposed inside the bifurcate member. Even if an external force is applied to a distal end of the bifurcate member, the bifurcate member is never released from the bearing portion, and smooth opening and closing functions of the temple may be guaranteed for a long period of time.

Abstract: A pair of eyeglasses includes a pair of lenses having a bridge member secured between the lenses and having two segments secured to the outer portions of the lenses with adhesive material for supporting legs and for allowing the segments to be secured to the lenses without drilling holes in the lenses. Two blocks each includes an end surface for adhering to the lenses and each includes an aperture for engaging with the extensions of the segments and for allowing the segments to be adjusted relative to the blocks and the lenses.

Abstract: A crank mechanism for eyewear comprises a rigid, elongated member which extends across the front frame of the eyewear. Opposite ends of the crank mechanism pivotally connect to the front ends of the right and left temple members, respectively, and operates to move the temple members between their open and folded positions simultaneously with each other.

Abstract: A temple mounting structure including a rim lug raised from one rim of an eyeglass frame having a vertical axle hole and a transverse guide slot in communication with the vertical axle hole, a circular swivel block turned in the vertical axle hole of the rim lug, a socket holding a compression spring, a temple having a shoulder stopped outside the socket and a coupling rod inserted through the socket and the compression spring into the transverse guide slot of the rim lug and fixed to the circular swivel block, and a stepped, tubular stop member mounted around the coupling rod of the temple and stopped between the rim lug and the compression spring and forced by the spring force of the compression spring to hold the temple between the operative position and the collapsed position.

Abstract: A spectacle frame includes two extensions extended from the side portions and each having a magnetic member. A pair of legs are pivotally coupled to the extensions and each has another magnetic member secured in one end for engaging with the magnetic members of the frame so as to rotate the legs to a position parallel to the extensions and perpendicular to the frame by an attraction force between the magnetic members. The legs will not apply a spring force but may apply a gentle force against the users such that the users may feel more comfortable when wearing the spectacle frame.

Abstract: The engagement device has a first seat having a longitudinal extension and formed in a first end of a lens of a pair of eyeglasses. A second seat, also formed in the first end of the lens, has an essentially circular configuration and communicates with the first seat. The engagement device also has a longitudinal bridge connected to a second end of a temple and a cylinder connected to the bridge. The bridge and the cylinder are interposed transversely between two wings formed at the second end of the temple. The bridge is accommodated in the first seat and the cylinder is accommodated in the second seat. The walls laterally delimiting the first seat may be manufactured at mutually different angles to each other according to the desired angle of the lens with respect to the temple.

Abstract: An eyeglass frame assembly includes a lens unit having two rearwardly extending side portions, each of which has a pivot hole with a guide portion, a positioning portion, and a constricted portion, a pair of bows, two connectors and two first pivot members for connecting the bows to the side portions. Each connector has a rear end pivoted to each bow about a vertical axis, and a front end with a slot to be aligned with the pivot hole. Each first pivot member horizontally passes through the aligned slot and the pivot hole and has a head portion, a first neck portion received in the slot, a second neck portion received in the pivot hole, and a stop member projecting outwardly of the pivot hole. A slit extends axially from the stop member to the first neck portion. The first pivot member is resilient transversely of the axis of the first pivot member. The stop member is pressed to thread through the guide portion.

Abstract: A spectacle frame includes two side portions each having an extension. The extensions each includes two gears rotatably secured in the end portions and engaged with each other. Two legs each has end secured to the outer gears of the extensions as to allow the legs to be rotated in concert with the outer gears. The extensions each includes a curved notch formed in the free end and the legs each includes a projection slidably engaged with the curved notches for limiting the rotational movement of the legs.

Abstract: A hinge structure of a spectacle frame has bearings formed at the ends of end pieces provided outside a pair of lenses or outside the rims supporting the lenses, pivotally rotatable shafts at the tips of a pair of temples are pivotally rotatably connected with the bearings, a compressed elastic means, being provided around the pivotally rotatable shaft exposed in the recess between the flange and the support face, to give pressure to the bearing for keeping the sliding face of the temple in slidable contact with the sliding face of the bearing. The hinge structure of a spectacle frame overcomes the disadvantages of the conventional hinge structure; that is functionally excellent because of easy assembling, needlessness of complicated adjustment, and capability to keep the temple turning torque constant for a long time; and that is also excellent in appearance and design.

Abstract: A temple to eye wire release eyeglass frame allows removal and replacement of lenses without the need for specialized tools or manual dexterity. The eyeglass frame includes temples, a wire frame having split sides with upper and lower eye wires. A double cam and two cam blocks fit together, with the temple attached to the double cam, so that when the temples are rotated, the lenses may be removed from the frame. Replacement lenses may be for use as sunglasses, rifle glasses, or simply for using a decorative color for appearance.

Abstract: An eyeglass including a lens and a temple/lens connector. The lens includes a peripheral side edge and a notch formed in the side edge. The notch is defined by an upper tang, a lower tang, and a seat edge formed therebetween. An aperture is formed in the lens. The temple/lens connector includes a base member having a first end, a second end, and an interior surface. The cam structure is provided proximate the first end and project from the interior surface. The cam structure is rotatable within the aperture and arranged and configured to secure the base member to the lens when rotated into a locked position and to allow the removal of the base member from the lens when rotated into an unlocked position.The cam structure may include a shaft having one end secured to the interior surface of the base member and a head formed on the other end of the shaft.

Abstract: This invention relates to a clamp type screw loosening prevention mechanism for eyeglasses parts which enables tight clamping of the end portion of the threaded rod of male screw toward the axis utilizing ingenious configulation of the female screw, which can effectively prevent loosening of all screwed parts such as temple hinge, rim closing block, pad, top rim, etc. The screw loosening prevention mechanism of the present invention consists of providing split cone projection on the exit side of the metal eyeglasses parts to be screw joined or fixed through whose piercing hole the end of the threaded rod of the male screw can come out, and by providing to the inside wall of the piercing hole which goes into this split cone projection the female screw thread which gradually reduces in inside diameter as the exit end approaches, the end part of the male screw threaded rod screwed therein is tightly clamped toward the center of axis by the spring-back resiliency of the split cone projection.

Abstract: An eyeglass frame assembly includes a lens frame body adapted to rest on the nose of the user and having two side portions, each of which has a generally circular horizontal positioning hole formed therethrough, and an engagement device provided in the positioning hole. Each of the positioning holes has two diametrically opposed extensions extending radially and outwardly therefrom. Each of two connectors is adapted to be coupled with the fastener device and includes an integral cylindrical connecting portion engaged within a corresponding one of the positioning holes, and an engagement device which engages a corresponding one of the engagement devices of the frame body so as to prevent rotation of the connecting portions of the connectors within the positioning holes of the frame body. Each of the connecting portions of the connectors is formed integrally with two diametrically opposed projections that protrude radially and outwardly therefrom.

Abstract: An eyewear hinge system comprising a front frame with a generally "T" shaped member extending sidewardly on opposite ends thereof and two temple members having means for frictionally gripping and holding the "T" member.

Abstract: An attachment for eyeglass frames which permits the wearer to quickly replace lenses without the use of optical hand tools or equipment, and which does not require the dexterity usually associated in working with miniature optical parts. The invention is permanently affixed to the eyeglasses, eliminating the possibility of loss, damage or disconnection. The invention is designed for use in instances where changing light conditions necessitate the need for tinted or sunglasses but where carrying additional frames is neither practical or desireable.

Abstract: The invention is a band hinge for flexibly connecting the temple member to the lens frame thereby preventing damage from inadvertent pressure or cyclic wear. A distinguishing feature of the invention is the use of a band hinge that holds together the temple member and the lens frame without the use of a pin or screw hinging mechanism. The invention allows for a high degree of freedom of movement for the temple member with respect to the lens frame which will prevent most forms of damages to the glasses from these types of events.

Abstract: Disclosed is a connector for use in connecting a lens to an earstem, comprising a main body which contains a hinge end and a lens receiving end. The connector contains a channel for receiving a portion of the lens. The pivot end of the channel contains a recess whereas the locking end of the channel contains a projection. The hinge end of the connector is attached to the earstem by a releasable pin connection. The lens is connected to the connector by inserting a lens into the channel where the lens is pivoted at the pivot end and then the connector is snapped down to cover over the top edge of the lens. Variations, component parts, and a wire frame dual lens detachable component system are also disclosed.

Abstract: In eyeglasses comprising glass-holding means which comprise pairs of retaining pins, which extend in respective bores of the lenses and are carried by a lens-holding portion of the eyeglass frame, it is desired to provide lens-holding means which are simple in design. To that end each pair of the retaining pins are constituted by two legs of a U-shaped wire and are connected by a crosspiece, which is connected to the lens-holding portion of the eyeglass frame.

Abstract: Eyeglass hinge system and bolt therefore for connecting the bow to the frame, wherein a hinge element is provided having a threaded bore in which the thread is either metric or U.S. standard and wherein the diameter, pitch diameter, and pitch dimensions of the bolt are intermediate in size to the corresponding dimensions of the metric and U.S. standard threads in the bore.