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 6610-01-345-9040
NSN 5945-01-371-8085
NSN 5975-00-702-2149
NSN 6110-01-089-9017
NSN 6320-00-513-8376
NSN 6610-01-617-6495
NSN 5855-01-042-7990
NSN 6220-01-085-0350
NSN 5998-00-233-7425
NSN 5835-01-013-9321
NSN 5915-01-159-7016
NSN 5930-00-519-8259