Abstract: A fastening device for use with conventional threaded, knurled, serrated, or smooth cylindrical studs comprising a cylindrical bore, the bore having a counter sink at one end thereof and a counter bore at the other end thereof, and a tubular fastener formed of relatively thin spring steel positioned within the bore. The fastener is slotted from end to end to be resiliently compressible, and thereby useable within bores of different diameters. At one end, the fastener has a rigid collar larger than the member which fits within the counter sink of the bore. The fastener adjacent the other end has a plurality of fingers, which are positioned in the counter bore. The fingers are folded so as to extend radially outwardly of the member at a position remote from the distal ends thereof to form an enlarged portion which substantially fills the counter bore, and are folded adjacent the distal ends so as to position the distal ends radially inwardly of the fastener.