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 6240-00-514-3507
NSN 5999-01-179-8070
NSN 5925-01-448-6958
NSN 6150-01-485-3313
NSN 5905-01-432-8814
NSN 5975-01-146-8426
NSN 5855-00-466-2309
NSN 6650-01-363-0963
NSN 6610-01-109-1826
NSN 5945-00-572-9171
NSN 5895-01-144-0131
NSN 5999-01-222-4962