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 5990-01-201-1698
NSN 6150-01-631-2797
NSN 5925-00-920-7066
NSN 6150-01-451-3064
NSN 6610-01-086-8719
NSN 5895-01-364-1017
NSN 6650-01-112-5634
NSN 5915-00-735-9649
NSN 5950-01-606-9819
NSN 5930-00-956-0362
NSN 2925-01-265-2853
NSN 6220-01-392-3650