936. A main difference between Lockbolt/Huckbolt tension and shear fasteners (other than their application) is in the number of locking collar grooves. shape of the head. method of installation.
937. A well-designed rivet joint will subject the rivets to compressive loads. shear loads. tension loads.
938. Alloy 2117 rivets are heat treated by the manufacturer and do not require heat treatment before being driven. by the manufacturer but require reheat treatment before being driven. to a temperature of 910 to 930°F and quenched in cold water.
939. Cherrymax and Olympic-Lok rivets utilize a rivet gun, special rivet set, and bucking bar for installation. utilize a pulling tool for installation. may be installed with ordinary hand tools.
940. Hole filling fasteners (for example, MS20470 rivets) should not be used in composite structures primarily because of the possibility of causing delamination. increased possibility of fretting corrosion in the fastener. difficulty in forming a proper shop head.
941. Metal fasteners used with carbon/graphite composite structures may be constructed of any of the metals commonly used in aircraft fasteners. must be constructed of material such as titanium or corrosion resistant steel. must be constructed of high strength aluminum-lithium alloy.
942. One of the main advantages of Hi-Lok type fasteners over earlier generations is that they can be removed and reused again. the squeezed on collar installation provides a more secure, tighter fit. they can be installed with ordinary hand tools.
943. The Dzus turnlock fastener consists of a stud, grommet, and receptacle. The stud length is measured in hundredths of an inch. tenths of an inch. sixteenths of an inch.
944. The general rule for finding the proper rivet diameter is three times the thickness of the materials to be joined. two times the rivet length. three times the thickness of the thickest sheet.
945. The markings on the head of a Dzus fastener identify the body diameter, type of head, and length of the fastener. body type, head diameter, and type of material. manufacturer and type of material.
946. The shop head of a rivet should be one and one-half times the diameter of the rivet shank. one-half times the diameter of the rivet shank. one and one-half times the diameter of the manufactured head of the rivet.
947. Threaded rivets (Rivnuts) are commonly used to join two or more pieces of sheet metal where shear strength is desired. attach parts or components with screws to sheet metal. join two or more pieces of sheet metal where bearing strength is desired.
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