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 6145-01-285-5552
NSN 5925-00-806-5341
NSN 5905-01-521-2968
NSN 6150-01-598-4403
NSN 5930-01-513-8519
NSN 4140-00-585-7763
NSN 5985-01-207-0097
NSN 5920-01-529-7697
NSN 5945-01-446-7929
NSN 6620-01-420-0964
NSN 6645-00-487-5169
NSN 6610-01-141-7014