Abstract: An expandable head rivet for sealing applications and the like having improved inspectability after setting. The rivet has an axially extending shank, a first substantially cylindrical section and a second tapered section between the first section and the shank, all generally conforming to the hole and counterbores in the workpiece. The face of the rivet head has a raised central section having a substantially flat surface perpendicular to the axis of the rivet of a cross sectional area between 50 and 110% of the cross sectional area of the shank of the rivet. Upon setting of the rivet in the workpiece, the head end of the rivet is flattened and radially expanded to tightly engage the cylindrical counterbore.

Abstract: An expandable head rivet for sealing applications and the like having improved inspectability after setting. The rivet has an axially extending shank, a first substantially cylindrical section and a second tapered section between the first section and the shank, all generally conforming to the hole and counterbores in the workpiece. The face of the rivet head has a raised central section having a substantially flat surface perpendicular to the axis of the rivet of a cross sectional area of at least a substantial percentage of the cross sectional area of the shank of the rivet. Upon setting of the rivet in the workpiece, the head end of the rivet is flattened and radially expanded to tightly engage the cylindrical counterbore.

Abstract: A lock spindle blind rivet assembly is provided which is intended to be received in a hole in a workpiece, and which is made up of a sleeve adapted to be received in the hole, a stem having a forward section with an outer diameter slightly less than the inner diameter of the sleeve and a rear section with an outer diameter slightly greater than the inner diameter of the sleeve, the forward and rear sections of the stem being separated by an annular locking groove which forms an annular shoulder around the stem. A collar having an outer diameter greater than the inner diameter of the sleeve, and having an inner diameter slightlygreater than the outer diameter of the forward section of the stem but less than the diameter of the annular shoulder, is slidably mounted on the forward section of the stem to be moved back along the forward section to engage and be stopped by the annular shoulder.

Abstract: A lock spindle blind rivet assembly is provided which is intended to be received in a hole in a workpiece, and which is made up of a sleeve adapted to be received in the hole, a stem having a forward section with an outer diameter slightly less than the inner diameter of the sleeve and a rear section with an outer diameter slightly greater than the inner diameter of the sleeve, the forward and rear sections of the stem being separated by an annular locking groove which forms an annular shoulder around the stem. A collar having an outer diameter greater than the inner diameter of the sleeve, and having an inner diameter slightly greater than the outer diameter of the forward section of the stem but less than the diameter of the annular shoulder, is slidably mounted on the forward section of the stem to be moved back along the forward section to engage and be stopped by the annular shoulder.