Nuts and Washers

A nut having 6 flat sides, flat on the bottom and having a slotted cylindrical or dome shaped upper portion. It is designed to provide positive locking when used with a solid or split (cotter) pin. Excludes NUT (1), PLAIN, SLOTTED, HEXAGON.

An item internally threaded from one end, and completely inclosed on the opposite end. The outer periphery parallel to the threaded axis may be square, cylindrical, hexagonal, octagonal, or dodecagonal and taper to a cone or dome shape on the closed end. For like items which are stamped or formed from sheet stock, see NUT (1), STAMPED. For similar items which are flat on top and bottom see NUT (1), SLEEVE or POST, ELECTRICAL-MECHANICAL EQUIPMENT.

A nut, flat on top and bottom, having 12 flat sides. For items having a thickness (or height) exceeding two times the width across the flats, use POST, ELECTRICAL-MECHANICAL EQUIPMENT. (When height or thickness and/or width across the flats is designated as a tolerance dimension, the maximum dimension will be used to determine compliance).

A nut, flat on top and bottom having 6 flat sides. For items which have internal tapered or straight (parallel) pipe threads, specific electrical conduit size designation, and which when installed, provide a method of tightening to lock the connection, see LOCKNUT, ELECTRICAL CONDUIT. See also LOCKNUT, TUBE FITTING. For items having a thickness (or height) exceeding two times the width across the flats, use POST, ELECTRICAL-MECHANICAL EQUIPMENT. (When height or thickness and/or width across the flats is designated as a tolerance dimension, the maximum dimension will be used to determine compliance.)

A nut, flat on top and bottom, having 4 flat sides. For items having a thickness (or height) exceeding two times the width across the flats, use POST, ELECTRICAL-MECHANICAL EQUIPMENT. (When height or thickness and/or width across the flats is designated as a tolerance dimension, the maximum dimension will be used to determine compliance.)

A nut having a flat bearing surface and 6 flat sides with slots in its upper portion. It is designed to provide positive locking when used with a solid or split (cotter) pin. Excludes NUT (1), PLAIN, CASTELLATED, HEXAGON.

A nut having a sleeve portion on its under side, which can be crimped or clinched to hold the item in place when inserted in a hole.

A nut having an externally splined sleeve which holds it in position when forced into a hole of slightly smaller diameter.

A nut having wings designed for manual turning without driver or wrench.

A nut having ears or lugs designed to hold it in position after its installation in a specially designed channel. An integral feature is incorporated for locking on the threads of a mating member.

An item composed of a specially designed channel and a series of nuts having integral self-locking features assembled in predetermined spacing.

A nut formed from sheet spring material, usually steel, into varying flat, concave, bent or curved designs, having apertures with suitable boss or bosses usually on the upper side capable of securely gripping a mating threaded member. Excludes NUT (1), STAMPED.

A washer of nonresilient material usually having two parallel bearing surfaces. The outside and/or inside edges have one or more protuberances. The ends and/or edges may be prebent at any angle or the protuberances may be prebent at any angle to the bearing surfaces. The keys or lugs may be fitted into keyways in adjacent material or they may be bent over after application to hold or lock one or more items in place. Excludes thrust type washer.

A nut with a flanged base of varied shapes which may be plain or mounted by rivets, bolts, welding, intergral prongs or by bonding.

A metallic headed fastener having internal threads for a portion of the full length. It may have a smooth, hexagon or splined shank with an open or closed end. Is designed to be expanded tightly against the material it is being installed in by means of a special tool. The item must have a specified grip range. The grip range is the thickness of the material the item is being installed in. See also NUT (1) SELF-LOCKING, BLIND RIVET. Excludes NUT (1), SLEEVE.

An item which resembles any of various nuts in shape and is intended for a subsequent threading operation.

A nut having 12 drive points, 24 sides, and an integral washer which extends beyond the points or periphery.

A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery.

A nut having 4 flat sides and an integral washer which extends beyond the flats or periphery.

A nut having opposite convex spherical bearing surfaces and 6 flat sides.

A nut having 1 convex, spherical bearing surface and 6 flat sides. Items may have a removable collar. See also NUT (1), PLAIN, CONE SEAT, HEXAGON.

A cylindrical-shaped nut, the end opposite the bearing surface being designed with an internal socket or splines for use with an inserted wrench.

A nut internally threaded from one end, and completely enclosed on the opposite end. The outer periphery parallel to the threaded axis may be square, cylindrical, hexagonal, octagonal, dodecagonal or the like and taper to a cone or dome shape on the closed end. An integral feature is incorporated for locking on the threads of a mating memeber. Excludes NUT (1), STAMPED.

A nut having 12 drive points and 24 sides. The bearing surface may be washer faced. An integral locking feature is incorporated in the design of the head or in the threads.

A nut having a flat bottom and 6 sides. An integral feature is incorporated for locking on the threads of a mating member. Excludes NUT (1), SELF-LOCKING, CAP.

A nut having a flat bottom and 4 flat sides. An integral feature is incorporated for locking on the threads of a mating member. Excludes NUT (1), SELF-LOCKING, CAP.

A nut formed from sheet spring material, usually steel, into various shapes, having the external appearance of a solid nut, and having an aperture with suitable bosses, lugs, notches, and/or slits capable of securely gripping a mating threaded member. See also NUT (1), SHEET SPRING.

A nut with a flanged base of varied shapes which may be plain or mounted by rivets, bolts, welding or integral prongs. An integral feature is incorporated for locking on the threads of a mating member.

An item formed from sheet spring material into varying flat, concave, curved, or nutlike design. It has an aperture with an elliptical-shaped hole or suitable lugs or prongs designed to retain threaded or unthreaded stud like projecting memebers. When pushed on, it grips by imbedding into the material of the projecting memebers, and does not mate with a thread helix. See also RING, RETAINING.

A nut having 6 flat sides and a cone seat bearing surface. Items may have a removable collar. See also NUT (1), PLAIN, SINGLE BALL SEAT, HEXAGON.

A nut having wings designed for manual turning without driver or wrench with an integral feature incorporated for locking on the threads of a mating member.

A cylindrical-shaped nut, the end opposite the bearing surface being designed with an internal socket or splines for use with an inserted wrench. An integral feature is incorporated for locking on the threads of a mating member.

A washer of nonresilient material usually having two parallel bearing surfaces. The outside and/or inside edges have one or more notches. Excludes thrust type washers.

A washer having a centrally located hole with a solid or laminated cross-section and two flat parallel bearing surfaces. The hole must be 75 percent or less than the largest dimension and the bearing surface finish is greater than 32 microinch (0.8 micrometer). The thickness cannot exceed 25 percent of the largest outside dimension. When the largest outside dimension is less than 1/4 inch or 6mm, the thickness must be 0.006 inches (0.15mm) or greater and for items 1/4 inch (6mm) or larger, the thickness must be 0.016 inches (0.4mm) or greater. The maximum tolerance is applied to dimensions and used as a determining factor. Items with separable lamination use SHIM. For items fabricated from ceramic or electrically rated materials by specification or industry standards use INSULATOR (1), WASHER. Excludes DISK, VALVE, graphite impregnated and lubricated items.

A washer which is usually round with a centrally located hole. Its edges and two bearing surfaces are so designed that applied pressure brings into play the spring tension and/or frictional locking principle which materially resists any tendency toward turning. It may be made of one or two pieces

A nut with projection(s) that is/are designed to localize heating, during welding, at predetermined points and to fuse with the metal to which the nut is mounted.

A nut, round in shape, having all or part of its outer surface knurled. It may have provisions for external wrenching. For items having a thickness (or height) exceeding two times the outside diameter, use POST, ELECTRICAL-MECHANICAL EQUIPMENT. See also NUT (1), PLAIN, ROUND. (When height or thickness, and/or outside diameter is designated as a tolerance dimension, the maximum dimension will be used to determine compliance).

A nut, circular in shape, which may have wrenching facilities such as flats, holes, protrusions, slots or splines in or on the periphery or in the face opposite the bearing surface. For items having a thickness (or height) exceeding two times the outside diameter, use POST, ELECTRICAL-MECHANICAL EQUIPMENT. See also NUT (1), PLAIN, KNURLED. (When height or thickness and/or outside diameter is designated as a tolerance dimension, the maximum dimension will be used to determine compliance.)

A hexagon nut having a concave face and a concave or slotted top.

A square nut having a concave face and a concave or slotted top.

A nut, flat on top and bottom, having four flat sides of which two parallel sides are shorter than the other two. For items having a thickness (or height) exceeding two times the width, use POST, ELECTRICAL-MECHANICAL EQUIPMENT. (When height or thickness and/or width is designated as a tolerance dimension, the maximum dimension will be used to determine compliance.)

A nut of cylindrical or partly cylindrical cross-section with integral threads perpendicular to the axial centerline. Ends may be flat or flanged. An integral feature is incorporated for locking on the threads of a mating member. Excludes NUT (1), SELF-LOCKING, ROUND.

A nut having a sleeve portion on its under side, which can be crimped or clinched to hold the item in place when inserted in a hole. An integral feature is incorporated for locking.

A nut having an externally splined sleeve, which holds it in position when forced into a hole of slightly smaller diameter. An integral feature is incorporated for locking.

A nut round in shape, whose outer surface or portion(s) is/are knurled. It may have provisions for external wrenching. An integral feature is incorporated for locking on the threads of a mating member.

A nut, circular in shape, which may have wrenching facilities such as flats, holes, protusions, slots or splines in or on the periphery or in the face opposite the bearing surface. An integral feature is incorporated for locking on the threads of a mating member. Do not use if a more specific item name applies. Excludes COLLAR, PIN-RIVET, THREADED; INSERT, SCREW THREAD; NUT (1), SLEEVE; NUT(1), PLAIN, CAP; and TURNBUCKLE BODY.

A combination eye and nut, formed in one piece, and when fitted to an externally threaded object, the eye is used as an attaching medium.

A washer with one surface shaped to fit a similarly curved surface, the other surface of the washer being either parallel with the shaped surface or in the form of raised boss having either a flat bearing surface or a recess designed for holding a nut. Excludes WASHER (1), CONCAVE and WASHER (1), CONVEX.

Two or more different sizes and/or types of nuts grouped together in a single package.

Two or more different size and/or types of washers grouped together in a single package.

A washer having a centrally located hole and two flat bearing surfaces which are not parallel.

A washer which is round with a centrally located hole. One bearing surface is smooth, flat, and unbroken, the other bearing surface is smooth, unbroken, and is recessed to form a curved or spherical contour. See also WASHER (1), CONVEX. Excludes WASHER (1), RECESSED and BEARING, WASHER, THRUST.

A washer which is round with a centrally located hole. One bearing surface is smooth, flat, and unbroken, the other bearing surface is smooth, unbroken, and is raised to form a curved or spherical contour. See also WASHER (1), CONCAVE. Excludes BEARING, WASHER THRUST.

A washer or cone or disk shape with a centrally located hole, designed to accommodate a flat or oval head screw and provide additional bearing area on the material being fastened. It may or may not have a flush flange feature.

A washer of any peripheral shape having a centrally located hole. Both bearing surfaces are parallel and flat, but one or both of the bearing surfaces must be broken by a counterbore, countersink, or similarly shaped recess. The thickness must not exceed 25 per cent of the outside diameter or the largest outside dimension. The maximum limit of the tolerance or range applied to the thickness and/or largest outside dimension must be used to determine compliance. Excludes WASHER, CONCAVE, RETAINER, PACKING, and thrust type washers. See also SPACER, SLEEVE; and SPACER, STEPPED.

A washer, round in shape, and having a centrally located hole. One bearing surface is flat and unbroken, the other surface is in the form of a raised shoulder (boss) having a flat bearing surface. The thickness of the shoulder (boss) must not exceed 25 percent of the shoulder (boss) diameter. For items having a shoulder (boss) of greater thickness, use BEARING, SLEEVE; BUSHING SLEEVE; or SPACER, SLEEVE. Excludes INSULATOR, WASHER and thrust type washers.

A washer, round in shape, having a centrally located hole. One bearing surface is flat, the other surface is in the form of a raised shoulder (boss) having a flat bearing surface. Either or both of the bearing surfaces must be broken by a counterbore, countersink, or similar shaped recess. The thickness of the shoulder (boss) must not exceed 25 percent of the shoulder (boss) diameter. For items having a shoulder (boss) of greater thickness, use BEARING, SLEEVE; BUSHING, SLEEVE; or SPACER, SLEEVE. Excludes INSULATOR, WASHER and thrust type washers.

A washer, round in shape, and having a centrally located hole. Its two flat parallel bearing surfaces are divided or cut along the radius, leaving a cleft, fissure, or cutaway portion across the rim which extends from the outer circumference to the washer hole and is always as large as, or larger than the diameter of the hole.

A washer, round in shape, and having a centrally located hole. Its two flat parallel bearing surfaces are divided or cut along the radius, leaving a cleft, fissure, or cutaway portion across the rim whch extends from the outer circumference to the washer hole but which is never as large as the washer hole diameter. Excludes WASHER (1), LOCK.

A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.

A square or rectangular flat metal plate upon which replaceable nuts are assembled in predetermined spacing. The plate has a centrally located hole.

An item consisting of a flat metal ring designed to be fastened in place, upon which replaceable nuts are assembled in predetermined spacing.

A fastening device of rigid or semirigid material of various shapes and lengths having two or more apertures with lugs or prongs; threaded holes; or nuts. The apertures, threaded holes or nuts may be of any predetermined spacing.

A nut with projection(s) that is/are designed to localize heating, during welding, at predetermined points and to fuse with the metal to which the item is mounted. An integral feature is incorporated for locking on the threads of a mating member.

A nut having 8 flat sides, flat on the bottom and having a slotted cylindrical or dome shaped upper portion. It is to provide positive locking when used with a solid or split (cotter) pin. Excludes NUT (1), PLAIN, SLOTTED, OCTAGON.

A nut, flat on top and bottom, having eight flat sides. It may include a retaining dowel pin. For items having a thickness (or height) exceeding two times the width across the flats, use POST, ELECTRICAL-MECHANICAL EQUIPMENT. (When height or thickness and/or width across the flats is designated as a tolerance dimension, the maximum dimension will be used to determine compliance).

A nut having a flat bearing surface and 8 flat sides with slots in its upper portion. It is designed to provide positive locking when used with a solid or split (cotter) pin. Excludes NUT (1), PLAIN, CASTELLATED, OCTAGON.

An item having two flat bearing surfaces, conforming to the same shape as the base of a NUT (1), PLAIN, PLATE and NUT (1), SELF-LOCKING, PLATE. It is used to provide better alignment in assembly.

An item of various shapes and sizes, having two flat bearing surfaces which may or may not be parallel. It is used in the manufacture of a washer by drilling or punching a hole in the center. Excludes DISK (as modified).

A washer, round in shape, and having a centrally located hole. The inside edge is notched to facilitate installation over the threads of a SCREW, PANEL FASTENER and is designed to be flattened to retain the fastener to a panel.

A plain nut on which has been assembled a nonremovable washer.

A nut of cylindrical or partly cylindrical cross-section with integral threads perpendicular to the axial centerline. Ends may be flat or flanged. Excludes NUT (1), PLAIN, ROUND.

A metallic headed fastener having internal threads for a portion of the full length. It may have a smooth, hexagon or splined shank with an open or closed end. It is designed to be expanded tightly against the material it is being installed in by means of a special tool. The item must have a specified grip range. The grip range is the thickness of the material the item is being installed in. An integral feature is incorporated for locking on the threads of a mating member.

A nut having 6 flat sides, flat on the bottom and having a slotted cylindrical or dome shaped upper portion. An integral feature is incorporated for locking on the threads of a mating member. The slots when used in conjunction with a solid or split (cotter) pin, act as an extra "fail safe" feature in critical applications. Excludes NUT (1), SELF-LOCKING, SLOTTED, HEXAGON.

A nut having 8 flat sides, flat on the bottom and having a slotted cylindrical or dome shaped upper portion. An integral feature is incorporated for locking on the threads of a mating member. The slots, when used in conjunction with a solid or split (cotter) pin, act as an extra "fail safe" feature in critical applications. Excludes NUT (1), SELF-LOCKING, SLOTTED, OCTAGON.

A nut having 6 flat sides and a cone seat bearing surface. Items may have a removable collar. An integral feature is incorporated for locking on the threads of a mating member. See also NUT (1), SELF-LOCKING, SINGLE BALL SEAT, HEXAGON.

A nut having 12 drive points, 24 sides, and an integral washer which extends beyond the points or periphery. An integral feature is incorporated for locking on the threads of a mating member.

A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery. An integral feature is incorporated for locking on the threads of a mating member.

A nut having one convex, spherical bearing surface and 6 flat sides. Items may have a removable collar. An integral feature is incorporated for locking on the threads of a mating member. See also NUT (1), SELF-LOCKING, CONE SEAT, HEXAGON.

A nut having a flat bearing surface and 6 flat sides with slots in its upper portion. An integral feature is incorporated for locking on the threads of a mating member. The slots, when used in conjunction with a solid or split (cotter) pin, act as an extra "fail safe", feature in critical applications. Excludes NUT (1), SELF-LOCKING, CASTELLATED, OCTAGON.

A nut having a flat bearing surface and 8 flat sides with slots in its upper portion. An integral feature is incorporated for locking on the threads of a mating member. The slots when used in conjunction with a solid or split (cotter) pin, act as an extra "fail safe" feature in critical applications. Excludes NUT (1), SELF-LOCKING CASTELLATED, OCTAGON.

An internally threaded item with a cylindrical and/or square, hexagonal, octagonal, or dodecagonal outer periphery (parallel to the threaded axis) a portion(s) of which may or may not be enlarged, forming a flange(s) and/or shoulder(s). Items not having an enlarged outer portion may be threaded, a part of the full length, or tapped from both ends. Items having an enlarged outer portion (flange(s) or shoulder(s)) may be threaded the full length, threaded a part of the full length, or tapped from both ends. Items tapped from both ends shall have either right-hand threads on both ends or left-hand threads on both ends. For items conforming to any of the above and having a length overall exceeding two times the largest outside diameter or width across flats, use POST, ELECTRICAL-MECHANICAL EQUIPMENT. For items with an outside contour that is the same the full length, having a continuous thread through its entire length, and the length does not exceed two times the diameter or width across the flats use NUT (1), PLAIN (as modified). Excludes NUT (1), PLAIN, CAP. See also TURNBUCKLE BODY.

A nut on which has been assembled a nonremovable washer. An integral feature is incorporated for locking on the threads of a mating member.

A grouping of two or more identical or similar WASHER (1), SPRING TENSION which have been matched together to meet a specific deflected height tolerance when a predetermined load compression is axially applied. Includes only those washers designed and tested to accomplish a specifically desired function.

A nut having one convex, spherical bearing surface, with 12 drive points, 24 sides. Items may have a removable collar. An integral feature is incorporated for locking on the threads of a mating member.

A nut having five flat sides and a flat surface on both ends.

A nut having 12 drive points, 24 sides, flat on the bottom and having a slotted cylindrical or dome shaped upper portion. An integral feature is incorporated for locking on the threads of a mating member. The slots when used in conjunction with a solid or split (cotter) pin, act as an extra "fail safe" feature in critical applications.

An internally threaded fastener, plain or self-locking, of various shapes attached to a preformed item of semi-rigid material designed to retain, position or support other items by its own inherent spring action. The internally threaded fastener and the preformed item may be of one piece construction or fastened together by other means.

A nut, circular in shape, having wrenching facilities such as flats, holes, protrusions, slots or splines in or on the periphery. It has an integral washer which extends beyond the wrenching element periphery.

A nut, circular in shape, having wrenching facilities such as flats, holes, protrusions, slots or splines in or on the periphery. It has an integral washer which extends beyond the wrenching element periphery and an integral feature is incorporated for locking on the threads of a mating member.

A washer of various shapes having a centrally located hole. It is primarily used as a seat for a bolt or screw to distribute pressure and has a sealing element. It may be used in connection with metallic washers to which it can be bonded.

A nut having 12 drive points and 24 sides, flat on the bottom, and having a slotted cylindrical or dome shaped upper portion. It is designed to provide positive locking when used with a solid or split (cotter) pin.

A washer that is shouldered and round in shape and also has a serrated outside diameter. Its serrated edges are so designed that when installed applied pressure produces a spring tension and/or locking principle. The item provides a base, seat, or strike plate when used with equipment.

An item having three equiangular flat sides and an integral washer extending beyond the flats or periphery.

An item having internal threads designed to mate with an external thread. The item is two permanently joined, independently rotatable slotted nuts. In the open state (slots aligned), the item can be readily slipped onto or off a threaded rod, bolt, or the like. In the closed state (180 degrees between nut slots), the nut locks onto the external thread. The slots run the entire height of the nut. Excludes NUT, PLAIN, SLOTTED (as modified); NUT, SELF-LOCKING, SLOTTED (as modified).

A two-piece fastener consisting of a sleeve and an expander nut. The nut is self-retaining when drawn into the sleeve with a mandrel or other special tool. The item is designed to be installed or expanded from only one side of a structure or component part. Excludes RIVET, BLIND.

An item round in shape having a centally located hole. It consist of a steel ring with protrusions on one face. When the item is placed under the bolt head or nut end, the protrusions create a gap. As the bolt is tensioned, the clamping force flattens the protrusions reducing the gap. Correct bolt tension is evaluated by observing the remaining gap.

An item round in shape having a centrally located hole. It consists of two concentric (inner and outer) steel rings, the inner ring is smaller in diameter and higher than the other. These rings are sandwiched between two close tolerance plain washers. As the assembly is tightened, the inner ring takes the load and is deformed until the loose outer ring is bound between the upper and lower plain washers and cannot be moved. The tightened load in the bolt is equal to the load required to compress the inner ring. When the binding of the outer ring occurs and can not be moved, it is a sign that the desired load has been reached.

An item like a wing nut in shape and designed to restrain the rotating movement of an axle in an operating device mechanism. Excludes NUT, PLAIN, WING

A metallic item having internal threads for use in assembling CABLE ASSEMBLY, FIBER OPTIC components during splicing operations.

An item consisting of a straight flat strip designed to be fastened in place, upon which replaceable sheet spring nuts are assembled in predetermined spacing.

An item mounted at the end of a lockscrew to provide a larger pressure surface.

An item composed of a specially designed angle and a series of nuts having integral self-locking features assembled in a predetermined spacing.

A collection of two or more various sized plate strips, upon which NUT,SELF-LOCKING, PLATE are assembled in predetermined spacing.

A collection of two or more various sized plate strips with provisions for attaching NUT, SELF-LOCKING, PLATE. For strips with NUT, SELF-LOCKING, PLATE, see NUT ASSEMBLY SET, SELF-LOCKING, RETAINER STRIP.

A nut having a hexagon top end and an internal threaded skirt (bottom end). When installed the top end is designed to break to a certain torque. The skirt remains in place and provides fastening and becomes non-removable.