DS EN 3660-016:2009 Aerospace Series - Cable Outlet Accessories For Circular And Rectangular Electrical And Optical Connectors - Part 016: Grommet Nut, Style A, Self-Locking And Non Self-Locking For En 3645 - Product Standard Describes a range of grommet nuts, style A, for use under the following conditions: Associated electrical connector(s): EN 3660-002.