Groove 0.062 in. W by 0.031 in. Deep in outside surface
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.)
NSN 7035-00-946-2642
NSN 6135-00-369-2368
NSN 5996-01-576-9852
NSN 6240-01-040-8897
NSN 6130-01-192-1329
NSN 5895-00-637-2658
NSN 5925-01-534-4866
NSN 5910-01-633-9963
NSN 5910-01-298-1182
NSN 5975-00-518-1733
NSN 5910-01-284-5331
NSN 6130-00-313-2364