GESIPA CAP – Closed end blind rivets, naturally air and watertight The structure For technical reasons, the rivet mandrel of the GESIPA CAP blind rivet must be fixed in the rivet body. However this means that the rivet body can only deform slightly during the setting process. As a result, the cap blind rivet only has marginal hole filling capability. However this is necessary to be able to compensate large borehole tolerances. Tight connections with care The above-mentioned technical situations make careful preparation of the application imperative. The hole diameter should be as tight as possible to ensure a flawless function in the application for a long period. If the GESIPA CAP blind rivet is processed carefully, it forms the basis for a reliably „tight“ connection.