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 6650-01-449-3042
NSN 6150-00-851-1207
NSN 6650-01-112-0453
NSN 6220-00-376-8103
NSN 5996-01-269-0982
NSN 5965-00-303-9701
NSN 2925-00-159-9003
NSN 6135-01-648-4875
NSN 5999-01-342-6946
NSN 5915-01-651-3006
NSN 5930-00-173-7933
NSN 5935-01-220-4272