Abstract: A one-piece blind nut, usable for flush attachment to a workpiece by axially collapsing the nut through the use of a mandrel and an anvil, includes a body member with an internally threaded end portion which receives the threaded end portion of the mandrel. An aperture of predetermined diameter is provided in the workpiece, and the blind nut, assembled to the mandrel, is inserted through the aperture. The end of the nut opposite the threaded portion includes a serrated exterior portion which is used to secure the blind nut to the workpiece in a non-rotating relationship without the use of a countersink in the workpiece.