TM 10-5411-205-133-9.General Repair Procedures (cont).(a) Determine thread size, grip range, style, and material of rivnut to be used.Grip length equals combined thickness of materials being fastened togeth-er. Grip range of rivnuts must encompass grip length.WARNINGDrilling creates metal chips which may enter eyes and cause seri-ous injury. Eye protection is required.CAUTIONDo not drill deeper than necessary to install rivet as you may drillthrough other side of panel.NOTEDrill hole size must match size of rivnut being installed. Quan-tities of sheets may be drilled at the same time whenwith sheet fasteners.(b)(c)(d)(e)(f)(g)(h)(i)Drill hole in structure.Remove all metal chips and remove burrs fromIf a countersunk head rivnut is being installed,100-degree machine countersink.held ‘togetherdrilled holes.countersink hole using aThread stem of appropriate pullup stud into rivnut. Stud should protrudethrough open end rivnuts, or be 1-1/2 threads from bottoming in closedend rivnuts.Coat rivnut body with sealer before installing.Insert rivnut in hole. Make sure sheets are heldpulling.tightly together beforeWith pullup stud parallel to axis of rivnut, pull up on rivnut. Exert firmpressure but do not bend or buckle metal sheets.Make sure fastened parts are not loose, rivnut does not rotate and rivnuthead is seated tightly against surface. Make sure rivnut threads are ingood condition. If threads are damaged or rivnut is improperly installed,remove it and install a new one.3-18
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