EINEN GEWINDESCHAFT UND KOPF AUFWEISENDES BEFESTIGUNGSELEMENT ZUR VERBINDUNG INSBESONDERE DUENNER WERKSTUECKE

摘要

A structural joint including a relatively thin workpiece and an externally threaded fastener having a flanged head with workpiece clamping means on the underside thereof. The clamping means comprises an annular rim on the flanged portion of the head defining a cup-shaped portion having a depth no greater than approximately one-half the pitch of the fastener thread which acts to draw the workpiece material into engagement with the rim.