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 6240-00-837-1001
NSN 6105-01-398-1509
NSN 4140-01-197-9883
NSN 5975-01-524-9334
NSN 5930-00-517-7293
NSN 6130-01-605-4397
NSN 5905-00-949-0252
NSN 6650-00-557-0780
NSN 6620-00-140-8644
NSN 5990-01-487-0871
NSN 5998-00-729-3051
NSN 6685-00-334-3872