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 6240-01-617-8254
NSN 6145-01-202-1337
NSN 5910-01-633-9963
NSN 5999-01-009-7658
NSN 6220-01-441-8662
NSN 6105-01-644-8962
NSN 6610-01-089-2487
NSN 5915-00-059-8368
NSN 5999-00-596-8745
NSN 6685-00-203-4485
NSN 6610-01-140-9608
NSN 6240-01-143-0397