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TM 1-1500-204-23-6b. Materials used in Fabrication. Rivets supplied in aircraft construction are normally fabricated native aluminum alloyHowever, in special cases, Monel, corrosion-resistant steel, mild steel or iron, and copper rivets are used. Except forunusual conditions, rivets have to be supplied only because that the functions intended This on purpose is usually suggested by rivet usagein the original fabrication of the aircraft. The selection of rivet products for any application is dependent ~ above usage,corrosion resistance, and strength.c. General Usage. Aluminum, steel, and copper rivets are normally used on army aircraft.(1)Aluminum rivets. There are assorted aluminum rivets offered for different applications. Each is described inthe following paragraphs.(a)1110 rivet Use 1100 rivet, make from pure aluminum, because that riveting nonstructural components fabricated native thesofter alloys (1100, 3003, and also 5052).(b)2117-T4 rivet. This rivet is most typically used in aluminum alloy frameworks Its main benefit lies inthe fact that it might be offered in the condition received without any type of further treatment.(c)2017-T4 and also 2024-T4 rivets. Use this rivets in aluminum alloy frameworks where strength higher thanthat the the 2117-T4 rivet is required. These rivets are generally used in sizes 3/16-inch diameter and also larger.(d)5056 rivets. Use this rivet for riveting magnesium alloy structures because of its corrosion resistantqualities No other rivets should be offered for this purpose, except under extreme conditions.(2)Steel rivets. Mild steel rivets room used mainly in riveting steel components Do not use galvanized rivets onsteel parts subjected to high temperature Corrosion-resistant stole rivets are used mostly in riveting corrosion-resistantsteel parts such together firewalls, exhaust stack bracket attachments, and comparable structures. Monel rivets are offered in specialcases for riveting high nickel-steel alloys. Monel rivets might be provided interchangeably v corrosion-resistant stole rivets,and are easier to drive. Corrosion-resistant steel rivets are preferable in corrosion-resistant stole parts.(3)Copper rivets. Copper rivets are provided for riveting copper alloys, leather, and other nonmetallic materialsThis kind rivet has actually only minimal usage in aircraft.CAUTIONDangerous corrosion will an outcome with the use of dissimilar metals such assteel, corrosion resistant steel, monel, copper or Iron, in rivetingaluminum structures Such applications will only be made underemergency conditions. Rivets will certainly be coated v zinc chromate primerFederal Specification TT-P1757 before installation that rivet, an additional coatof zinc chromate primer will be applied. Proper replacement will bemade as soon as products are available.dCorrosion Resistance. Corrosion resistance is generally considered adequate when the rivet material is thesame, or virtually the same type as that of the framework being riveted, noted the suitable anticorrosion surface treatmenthas been applied An example of this is the use of anodized 2117-T4, 2017-T4 and 2024-T4 rivets to attach anyaluminum alloy structure without creating adverse corrosion effects.e. Strength. For structure application, toughness of the replacement rivet is of major importance. Do not makereplacements with rivets of lower strength material unless the difference in strength is made up by the use of alarger rivet for example, a rivet the 2024-T4 aluminum alloy will certainly not be replaced by one make of 2117-T4 or 2017-T4aluminum alloy unless the next larger size is used. Use next bigger size 2117-T4 rivet to replace a 2017-T4 rivetFactors which impact the interchangeability the rivets v respect to head styles are provided in i 2-8a.f.Heat Treatment.. For details details in the heat treatment of metals used in rivets, refer to MIL-H6875 and MIL-H-6088. Do not drive 2024-T4 rivets in a hardened condition. These rivets must be taken within 20 minutes afterquenching to avoid cracking, unless they are held at low temperatures They may be held for approximately 2 weekswhen stored in dry ice, or for 24 hours when stored in ordinary ice.
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They may also be reheated-treated repeatedlywithout injury, provided treatment is carefully and properly performed. The number of reheat treatments should becontrolled ~ above the communication of ideal workability after repetitive reheat treatments.2-46