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 6650-00-919-3571
NSN 5920-00-051-2629
NSN 6610-00-689-3629
NSN 5920-00-151-4039
NSN 5855-01-396-0258
NSN 6620-01-367-2597
NSN 6220-01-143-5761
NSN 4140-01-282-7586
NSN 5990-01-037-0274
NSN 5920-00-378-1395
NSN 6110-01-463-5624
NSN 5985-01-044-6027