Floating Anchor Nuts, Nut Plates, or Plate Nuts have an internally threaded feature attached to, but floating within a plate. The plate is attached to a surface, but the floating nut in the nut plate allows for some misalignment in assembly.
Plate Nuts Diameters
Plate Nuts are available on the FCH Network with Imperial/US diameters that range from #1 to 6 and with Metric diameters that range from M5 to 6. The length of Plate Nuts is usually measured from the point to the underside of the head.