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 5990-00-404-2451
NSN 5965-00-208-4896
NSN 5920-01-146-4503
NSN 5985-01-326-5952
NSN 5910-01-469-7612
NSN 5920-01-456-9537
NSN 6145-01-494-0158
NSN 6620-01-194-6618
NSN 5999-00-561-7723
NSN 6645-01-407-0204
NSN 6685-01-224-1925
NSN 5935-01-287-0705