AIRCRAFT HARDWARE

Been used since sheet metal was
first utilized in aircraft
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Terms in this set (77)
Been used since sheet metal was
first utilized in aircraft
Solid Shank Rivets
High Thermal and Electrical
Conductivity. IRON and SILICON are MAJOR
impurities
FRICTION-LOCK RIVET: CHERRY FRICTION-LOCK
Designed to prevent the center
stem of a rivet from falling out
MECHANICAL-LOCK
RIVETS
Expensive tooling required for
their installation
HUCK-LOKS
Two types of head, 100 degree
countersunk and universal
improvement over the
friction-lock rivet because its
center stem is locked into
place with a lock ring.
Bulbed CherryLOCK/ Cherry
Mechanical-lock
Light weight, mechanically-locking
spindle-type blind rivets. three head styles: universal, 100-degree flush, and 100 degree flush shear.
OLYMPIC-LOKS
Economical to use and strong enough to replace solid shank rivets, size for size.
CHERRYMAX
Developed in the 1940s to meet the demand for fasteners which could carry greater shear loads.
HI-SHEAR RIVETS
Used to assemble two materials permanently. They are lightweight and are as strong as standard bolts.
LOCKBOLTS
They possess sufficient strength to withstand bearing and shearing loads and are available with flat and countersunk heads.
HI-LOKS
Made from lighter materials than HI-LOCK and has a shorter transition from the threaded section to the shank.HI-LITESA one-piece special fastener that combines two titanium alloys which are bonded together to form a strong structural fastener.CHERRYBUCKSStrongest special fasteners used in aircraft construction.TAPER-LOKHas a bead that encircles the bottom of its shank and is a further advancement in special fastener design.HI-TIGUEThese patented high-strength structural fasteners are used in close-tolerance holes where strength requirements are high but physical clearance precludes the use of standard AN, MS, or NAS bolts.JO-BOLTSIt allow parts to be fastened together with all of the strength unthreaded fasteners provide. It may be disassembled and reassembled an almost infinite number of timesTHREADED FASTENERSDeveloped by the B.F. Goodrich Company to attach rubber deicer boots to aircraft wing and tail surfaces.Goodrich RivnutsBolts that are typically used for air-frame structural applications have hex heads and range in size from AN3 to AN20.STANDARD AIRCRAFT BOLTSHave a thicker head that is DRILLED with a small hole in each of the flats and in the center of the head. the diameters of this bolts are in V16 increments while bolt lengths are in 1/8-inch increments.DRILLED HEAD ENGINE BOLTSBolts that carry a triangle mark on their heads and are ground to a much tighter TOLERANCE than standard bolts.CLOSE TOLERANCE BOLTSIt has a domed head that is typically slotted or recessed to accept a screwdriver. It only has a short portion of the shank that is threaded, and there is a small notch between the threads and the shank. This results in a long grip length which increases the bolt's shear strength and allows the bolt to rotate more freely in its hole.CLEVIS BOLTSHigh-strength steel bolts used primarily in areas that are subjected to high tensile loads. It can bear high tension loads and are frequently used to mount engines.INTERNAL WRENCHING BOLTSThese fine-thread nuts are designed to fit on a standard airframe bolt with a Class 3 fit and are used when the bolt is subjected to either shear or tensile loads.AN310 CASTLE NUTMade of the same material and has the same type of thread as a AN310 nut. However, this nuts are much thinner than standard castle nuts and, therefore, are used only for SHEAR loads on clevis bolts.AN320 SHEAR CASTLE NUTHas no castellations and, therefore, cannot be held in place using a cotter pin. A spring-type lock washer must be used in combination with the nut.AN315 PLAIN NUTIt is simply a second nut that is tightened against the primary nut so it cannot turn off.AN316 CHECK NUTMade in machine screw sizes from number 2 up through 1/4 inch and have coarse threads. They are available in carbon steel, corrosion-resistant steel (C), brass (B), and 2024 aluminum alloy (DD).AN340 MACHINE SCREW NUTThese nuts are like AN340 nuts except they have national-fine series threads. They are available in cadmium-plated carbon steel, corrosion-resistant steel (C), commercial brass (B), and 2024 aluminum alloy (DD).AN345 MACHINE SCREW NUTThis nut is designed for use on an aircraft engine and is not approved for airframe use. It is made of heat-treated steel and has national fine threads that produce a Class 3 fit and has cotter pin slotsAN355 SLOTTED ENGINE NUTThis engine nut is similar to the AN355 in that it is approved for use on engines only. However, it does not have cotter pin slots and has a black rustproof finish.AN360 PLAIN ENGINE NUTThese are used when it is necessary to remove a part frequently without the use of tools.AN350 WING NUTAlso known as lock nuts, employ a locking device in their design to keep them from coming loose. However, because there are several different types of lock nuts,SELF-LOCKING NUTSThese are used on bolts and machine screws and are held in position by a nylon insert above the threads.LOW-TEMPERATURE SELF-LOCKING NUTSNuts that are used in cases where the temperature exceeds 250. Some of these nuts have a portion of their end slotted and the slots swaged together.METAL SELF-LOCKING NUTSThese nuts resemble AN365 self-locking nuts except they have a much lower profile and are approved for SHEAR loads only.AN364 SHEAR SELF-LOCKING NUTSNuts that simplify the process of installing and removing inspection plates.ANCHOR NUTSThey are cost-economical nuts that are stamped out of sheet metal. Because of their semirigid construction, can be adapted for use in many situations.TINNERMAN NUTSThe most used threaded fastener in aircraft. They differ from bolts in that they are generally made of lower strength materials.SCREWSScrew that are used extensively for attaching fairings, inspection plates, fluid line clamps and other light structural parts.MACHINE SCREWSScrews are slotted and have a hole drilled through their head. They come in both coarse-thread (MS35265) and fine-thread (MS35266), both of which produce a Class 3 fit.FILLISTER-HEAD MACHINE SCREWThese countersunk screws are made of cadmium-plated carbon steel and are available with a recessed head for cross-point screwdrivers. steel and are available with a recessed head for cross-point screwdrivers. They are available with either fine or coarse threads and come with either an 82 degree or 100-degree countersink.FLAT-HEAD MACHINE SCREWMade of cadmium-plated carbon steel and has either a slotted or recessed head. The brass screws are typically coated with a black oxide and are sometimes used to mount instruments.ROUND-HEAD MACHINE SCREWThis screw has a large head that provides good holding ability on thin pieces of metal. This screw is available in cadmium-plated carbon steel in either slotted or cross-recessed heads.TRUSS-HEAD MACHINE SCREWMade of alloy steel, are heat treated, and can be used as structural bolts. They have a definite grip and the same shear strength as a bolt of the same size.STRUCTURAL SCREWSThis screw is similar in appearance to the fillister-head machine screw except for the cross on its head indicating that it is made of high-strength steel.FILLISTER-HEAD SCREWThis screw have an MS24694 part number and are made of heat-treated carbon steel that is cadmium plated. They are distinguished from 100 degree flat-head machine screws by the "X" marked on their head.FLAT-HEAD SCREWThese structural screws have a WASHER formed onto their head to increase the screw's holding ability.WASHER-HEAD SCREWScrews that have coarse-threads and are used to hold thin sheets of metal, plastic, or plywood together. The type-A screw has a gimlet (sharp) point, and the type B has a blunt point with threads that are slightly finer than those of a type-A screw.SELF-TAPPING SCREWSThese are used in shear applications and for safe tying.PINSThese are often used to provide a pivot for a joint where the pin is not likely to be removed. A roll pin is made of flat spring steel that is rolled into a cylinder but the two ends are not joined.ROLL PINSAlso known as flat-head, pins are used for hinge pins in some aircraft control systems.CLEVIS PINSThese are wire formed pins with two prongs that separate during installation. They are used as a locking device to hold pins or castle nuts in place. These low-cost and highly versatile fasteners are used virtually everywhere.COTTER PINSBoth the plain and threaded of this pin are used in aircraft structures to make a joint that is designed to carry shear loads. This type of pin does not allow any loose motion or playTAPER PINThey provide a bearing surface area for nuts, and act as spacers or shims to obtain the proper grip length for a bolt and nut assembly.WASHERSThey are used to adjust the position of castellated nuts with respect to drilled cotter pin holes in bolts as well as apply tension between a nut and a material surface to prevent the nut from vibrating loose.WASHERSprovides a smooth surface between a nut and the material being clamped. These washers are made of cadmium-plated steel, commercial brass (B), corrosion-resistant steel (C), and 2024 aluminum alloy (D).PLAIN WASHERSType of washers that are made of steel and are twisted so that when a nut is tightened against it, the spring action of the washer creates a strong friction force between the bolt threads and those in the nut.LOCK WASHERSThese washers have a countersunk edge to accommodate the radius on the bolt head.SPECIAL WASHERSWashers that are often used in aircraft interiors to secure upholstery and trim. These washers have a countersunk face to accommodate flush screws.FINISHING WASHERSwashers that have small keys or protrusions to engage slots cut into bolts or panels. In addition, they have tabs that can be bent up against a nut or bolt head to keep it from rotating.KEYED WASHERSAllows you to make a fast and inexpensive repair to worn or damaged holes.HOLE REPAIR HARDWAREThese inserts typically consist of a helix of stainless steel having a diamond cross section. They are typically installed in soft castings when the component is manufactured.HELI-COIL INSERTSTheses are thin walled, tubular elements with a flared end. The sleeves are installed in holes to accept standard bolts and rivet type fasteners.ACRES SLEEVESA fastener consists of a steel stud and crosspin in a removable cowling or door and a sheet spring-steel receptacle in the stationary member.AIRLOC FASTENERFasteners that are used to secure inspection plates, doors, cowlings, and other removable panels on aircraft. The most desirable feature of these fasteners is that they permit quick and easy removal of access panels for inspection and servicing purposes.TURNLOCK FASTENERSCowling and other inspection access doors that must be opened frequently can be held with these fasteners that require only a quarter of a turn to lock or unlock.DZUS FASTENERSA fastener consists of a housing containing a spring and a stud with a steel pin. This assembly is held onto the removable portion of the cowling or access door with a metal grommet.CAMLOCK FASTENERIt used on engine controls, emergency landing gear extension controls, trim tab systems, and various other applications.CONTROL CABLES AND TERMINALSIn areas where a linkage does not pass over any pulleys, this cable can be usedNONFLEXIBLE CABLEMade up of seven strands of seven wires each is called 7 x 7 or flexible cable and is available in 1/16- and 3/32-inch sizes in both galvanized carbon steel and stainless steel.FLEXIBLE CABLEThe most widely used cable, 7 x 19, is available in sizes from 1/8 inch up. It is EXTRA FLEXIBLE and is made of 133 individual wires wound in seven strands, each strand having 19 wires.EXTRA-FLEXIBLE CABLEThe cable fittings used most in large aircraft manufacture are MS-type swaged cable terminals.SWAGED TERMINALSMany light aircraft use these sleeves that are squeezed onto control cables to form terminal ends.NICOPRESS OVAL SLEEVESThe simplest method of safety wiring a turnbuckleSINGLE WRAP METHODUses a single piece of safety wire, but is spiraled around the turnbuckle barrel and passes through the center hole twice.SINGLE WRAP SPIRALEssentially the same as two single wrap spirals, one in each direction.DOUBLE WRAP SPIRALThis can be used in place of safety wire to safety turnbuckles if the turnbuckle hardware is drilled to accommodate this type of clip.SAFETY CLIPS