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 6135-01-417-6539
NSN 6110-01-074-4226
NSN 6135-00-503-7213
NSN 5990-01-195-3693
NSN 6220-01-537-1680
NSN 5999-00-729-5112
NSN 5895-00-001-2756
NSN 6220-01-013-9498
NSN 5905-01-385-0335
NSN 5935-01-415-0857
NSN 5925-00-584-7189
NSN 5990-01-411-5930