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 6610-01-426-5090
NSN 6645-01-555-4356
NSN 5925-01-607-2876
NSN 5930-01-450-4267
NSN 5910-01-622-5674
NSN 6610-01-485-8973
NSN 5855-01-400-1590
NSN 6220-01-444-4261
NSN 5920-00-477-9438
NSN 5945-01-194-7541
NSN 5999-01-467-3031
NSN 4140-01-025-1555