3b thread class, right-hand thread direction, hexagon nut style, 0.057 inches minimum and 0.066 inches maximum nut height, mrap rg-33; multiple launch rocket system (mlrs);5820-01-679-7243 radio set, an/vrc-135(v)1, handheld, manpack and small form fit (hms) 2-channel leader radio end item identification, 0.180 inches minimum and 0.188 inches maximum width across flats

A nut, flat on top and bottom having 6 flat sides. For items which have internal tapered or straight (parallel) pipe threads, specific electrical conduit size designation, and which when installed, provide a method of tightening to lock the connection, see locknut, electrical conduit. See also locknut, tube fitting. For items having a thickness (or height) exceeding two times the width across the flats, use post, electrical-mechanical equipment. (when height or thickness and/or width across the flats is designated as a tolerance dimension, the maximum dimension will be used to determine compliance.)