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 6620-00-273-8735
NSN 5920-01-313-0734
NSN 7035-01-087-7727
NSN 5925-00-758-7956
NSN 6145-00-205-4046
NSN 6610-01-471-3467
NSN 5960-00-240-2001
NSN 6650-01-195-0742
NSN 5999-01-578-6070
NSN 7035-01-271-1643
NSN 5935-01-424-6382
NSN 6135-01-387-0754