8Aerospace Solid Rivets - Identification Rivets manufactured in accordance with the AN/MS standards are identified by a four part code:AN or MS specification and head typeone or two letters that indicate the materialshank diameter in 1/32nd inch incrementsa dash followed by a number that indicates rivet length in 1/16th inch increments.
9Aerospace Solid Rivets - Identification Aircraft rivets are made of many materials, and come in a wide variety of shapes and sizesHow do you select the right size?How do you select the right material?We must know what the part number tells us…
10Aerospace Solid Rivets - Identification Example: rivet identificationstandard universal head solid rivetMaterial: 2117-T4 aluminium1/8 inch diameter5/16 inch in lengthRivet ID = either AN470AD4-5 or MS20470AD4-5
11Aerospace Solid Rivets - Identification Same rivet, different material:1100 aluminiumAN470A4-5 or MS20470A4-5.AN470 or MS20470 denote the specification for universal head typesAD is the material code for 2117-T4(A=1100, B=5056, C=copper, D=2017, DD=2024, F=stainless and M=Monel)4 = 4/32 or 1/8 inch diameter-5 = 5/16 inch length
12Aerospace Solid Rivet Installation Rivet installation summaryDrill appropriately sized holesDeburr holesSecure pieces together with ClecosInstall rivet, buck with rivet gun or use a rivet squeezer
13Aerospace Solid Rivet Installation .032” 2024-T6 sheet aluminum to be joined with rivetsRivet gunBucking barDrillDrill bit and chuck keyCenter punchClecoCleco pliers
14Aerospace Solid Rivet Installation Drilling holes with a #30 drill bitUse 1/8” rivets with a #30 (.1285”) drill bit
15Aerospace Solid Rivet Installation Deburr the holes by rotating (by hand) a much larger drill bit in the holesThis removes any metal shavings caused by drilling
16Aerospace Solid Rivet Installation Position the pieces together and secure using ClecosClecos maintain proper alignment of the pieces while rivets are being installed
17Aerospace Solid Rivet Installation Place the rivet in the holeMake sure you are using the correct size, material, and type of rivet
18Aerospace Solid Rivet Installation Align the rivet gun on the rivet headHold the bucking bar on the opposite end of the rivetPull the trigger on the rivet gun to hammer the rivet in place
19Aerospace Solid Rivet Installation Solid rivets can be installed using a rivet squeezer instead of a pneumatic rivet gunThe squeezer is hand operatedThe squeezer uses various inserts depending on the type and size of rivet being installed
20Aerospace Blind Rivets Used when you cannot physically access one side of the workBlind rivets are hollow, and thus weaker than solid rivetsTo retain strength of the joint:stronger material, larger diameter rivets, or more are necessary and of course20–50% heavier than a solid rivet because of steel stem
22Aerospace Rivets – Fuselage Repair Exterior of a riveted patch fuselage skin patchNote that solid fasteners are used except in the middle of the patchWhy would you use blind fasteners in this application?
23Aerospace Rivets – Fuselage Repair Interior of a riveted fuselage skin patchBecause the stringer on the interior of the fuselage prevents the bucking a solid rivet requiresBlind rivets are the only option when access is restricted
24Quality Assurance of Aerospace Fasteners Aerospace Fasteners Material SelectionAerospace Fasteners Testing
25Aerospace Fasteners Material Selection BackgroundSome factors to be considered before material selection are:The max. and min. operating temperaturesThe corrosiveness of the environmentFatigue and impact loadingAlways try to use standard fasteners, such as AN, MS, MIL, NAS, SAE
26Aerospace Fasteners Material Selection Alloy SteelsAluminumTitaniumStainless SteelSuperalloys
27Aerospace Fasteners Material Selection Aluminum is the predominant material used in the manufacture of commercial aircraft.Table 3 lists the typical aluminum alloys used in commercial aircraft.
28Basic Aerospace Fasteners Application The basic applications (or needs) for aerospace fasteners are:ShearTensionFatigueFuel tightnessHigh temperatureCorrosion control
29Aerospace Fasteners Testing Analyzing a JointCalculate all the load required for each type of joint failure:Rivet ShearSheet TensileBearingSheet ShearFailure will occur in the mode that corresponds with the lowest load carrying capability.
30Aerospace Fastener Standardization Most aerospace hardware is manufactured per government standardsThe three most common aircraft fastener standards used are:AN = Air Force/NavyNAS = National Aerospace StandardsMS = Military Standards
31Common Standardized Fasteners BoltsNutsWashersTurnbucklesCotter pinsScrewsRivetsPlumbing fittings (pipes and tubes)