Abstract: A fastener assembly is adapted for attaching an article to a workpiece having a slot. The fastener assembly includes a flanged nut which has internal threads and a non-circular cross-section, and a bolt having a threaded shank for engagement with the internal threads of the nut. The fastener assembly also includes a plate which comprises a main body and a tab portion extending from the main body. The plate has an opening complementary to the non-circular cross-section of the nut for receiving the nut therein and for securing the nut against rotation relative to the plate when the nut is placed in the opening. Alternatively, a nut is fixed to an underside of the plate against rotation and the opening in the plate is adapted for receiving the bolt therethrough. The tab portion of the plate extends into the slot in the workpiece for retaining the plate and nut and allowing limited float of the plate and nut with respect to the workpiece.