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 5975-01-211-9979
NSN 5930-01-578-9201
NSN 5999-01-069-2594
NSN 4140-01-315-7868
NSN 5950-01-412-8427
NSN 5905-01-198-2219
NSN 5915-01-142-7832
NSN 5960-01-502-6270
NSN 5920-00-671-9323
NSN 6650-00-035-9297
NSN 6620-01-158-0497
NSN 6620-00-144-7201