A plate nut, also known as a nut plate, anchor nut or anchor plate, is a stamped sheet metal nut that is usually riveted to a workpiece. They have a long tube that is internally threaded and a plate with two clearance holes for rivets. These terms are used interchangeably throughout product presentations to describe respective products.
Floating nut plates are low profile and lightweight plates used to install a captive nut behind a panel. The floating nut allows for an assembly that is not perfectly aligned. These lightweight, low-profile nut plates are designed for blind mounted applications where it is impractical to use hex nuts or where it is desirable to have an attached nut for ease of maintenance. F5000/MS21059 Series floating two-lug nut plates by HOWMET AEROSPACE (ARCONIC) are made of C1050 carbon Steel per AMS5085 or 8740 alloy steel per AMS6322. They are cadmium plated per AMS-QQ-P-416, Type II with dry film lubricant (F5000) or carbowax (F5000-CW). They are superseded by NASM21059 series.
MS21059J, MILITARY SPECIFICATION SHEET: Nut, Self-Locking, Plate, Two Lug, Floating, Low Height Steel, 125 KSI FTU, 450 Deg. F (01 Feb 1994) [Superseded by NASM21059].