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 6610-00-545-5632
NSN 6685-01-648-2179
NSN 6620-00-488-0626
NSN 5925-00-001-1277
NSN 5945-01-273-9790
NSN 6135-01-294-2131
NSN 5835-00-236-8760
NSN 5905-01-541-4705
NSN 6105-00-175-9078
NSN 5855-01-542-9059
NSN 5910-01-140-7465
NSN 5999-01-601-7492