Abstract: Disclosed is a fastener which includes a sleeve having an outwardly extending flange at a first end. A bolt extends in the sleeve and is axially moveable therein. A collar has a retaining portion which is engaged with a second end of the sleeve and the collar provides an outwardly extending flange adjacent the second end of the sleeve. The retaining portion of the collar prevents removal of the bolt from the sleeve when the bolt is at least partially axially withdrawn from the sleeve toward the collar. The retaining portion thereby retains the bolt in an axially displaceable, captive relation to the sleeve.

Abstract: 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.