Galvanic corrosion is accelerated electromechanical corrosion produced when a noble metal is in contact with another less noble metal, both being in a corrosive medium (such as damp air). Galvanic action is seldom considered in design but can often be one of the hidden causes of failures. Testing should be done in the design phase to calculate what distances are needed. Make sure the backside can accommodate the entire rivet before riveting. Since the blind side of the rivetnut is designed to form into a secondary flanged bearing surface, it is important to leave room forthe flange to expand and to seat properly. This is especially critical when riveting near other hardware, next to bends or folds, extrusions and/or cutouts on the sheet metal. When designing the primary hole, make sure to calculate the head diameter and its tolerances and layout the foot print of the head around the hole. Be sure to incorporate the riveting equipment in the design phase to prevent the need for customized and potentially costly tooling modifications.Īxial access is required on the primary sheet being riveted to allow for the flange to overlap the hole without interference. There must be adequate clearance above the hole so that riveting equipment can access the hole to be riveted without interference. Oval, Square or out-of-round shapes require the rivetnut to be custom produced. Holes should be round for round body rivetnuts, and hex for hex body rivetnuts. The design engineer should calculate the manufacturing tolerances of the hole to ensure proper fit so that interference issues will not arise at a later time. The Rivetnut will only work if it is used within the prescribed hole size. Burrs or bends in the sheet metal could affect the theoretical grip. 055 thick, it doesn’t necessarily mean that the actual grip will be. While two pieces of sheet metal each are. Be sure to accommodate for the “theoretical” grip versus the “actual” grip. If the rivetnut is applied over or under the specified grip range, it will not work properly. CBS-CE Closed End Copper/Steel Dome Headĭetermining the length of the rivetnut is critical to ensure it will function as intended.ACS-IR Open End Aluminum/Steel – Countersunk Head.SBS-IR Open End Steel/Steel Zinc Plated Dome Head.
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