A buffer includes a grommet having a tube portion, an attaching portion and an elastic engaging piece projecting inside the tube portion; an engaging member having an engaging step portion provided on an outer surface thereof for engaging the elastic engaging piece to prevent the engaging member from coming out in a counter-insertion direction when the engaging member is inserted into the tube portion in an insertion direction; and a damper main member having an abutting portion provided in a middle in a longitudinal direction for abutting against the engaging member when the damper main member is inserted into the engaging member. A projecting length adjustable device is formed for moving the damper main member in the counter-insertion direction and for fixing a projecting length of the damper main member projecting from the grommet.
The present invention is directed to a blind fastener, usually a blind rivet, (10) comprising a mandrel (22) and an elongate cylindrical body (16) mounted on a stem (24) of such mandrel so as to extend co-axially about a central axis A of such blind rivet, the body (16) having a flange (18) at one end and a tail end (20) at an axially opposed end, for insertion through a hole in a workpiece, the mandrel having a mandrel head (26) in operative engagement with this tail end (20) for transmitting force thereto during setting of such fastener, wherein the body (16) has two different external diameters (d, D) and a radially extending shoulder (32) therebetween such that the external diameter (D) of the body adjacent to the flange (18) is greater than the external diameter (d) of the body adjacent to the tail end, wherein the body between this shoulder (32) and the flange is at least partially encased in a resilient, shock absorbing material (36).
