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 6645-01-322-8897
NSN 5999-01-289-1235
NSN 6685-01-378-7090
NSN 6135-00-728-9860
NSN 5835-00-898-0201
NSN 5895-01-519-3252
NSN 5998-01-475-1598
NSN 5965-00-706-7005
NSN 6135-00-347-0595
NSN 6145-01-648-6793
NSN 5855-01-062-3126
NSN 6320-01-578-6006