2b thread class, right-hand thread direction, hexagon nut style, 0.117 inches minimum and 0.130 inches maximum nut height, w/s:airborne mobile dir air spt ctl (2id),(02m jul83)(an/uyq-3a); shipboard material handling equipment (mhe); stream (std. tensioned replenishment at sea method); l.p. compressors; fire pumps; boilers, 1200 psi; vehicle, aircraft refueler r-14; aircraft, (ac-130h, mc-130h, ec-130e, hc-130); support equipment, b-1 aircraft; 2420-66-148-7692, hmee (high mobility engineer excavator); multiple launch rocket system (mlrs); a4 bradley fighting vehicle; a3 bradley fighting vehicle; armored multi-purpose vehicle (ampv) end item identification, 0.362 inches minimum and 0.375 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.)