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 6610-01-148-2181
NSN 6320-01-648-5538
NSN 5998-01-253-2317
NSN 5960-01-408-8263
NSN 5990-01-367-9168
NSN 5950-00-166-0794
NSN 5925-01-344-4901
NSN 5985-01-417-3738
NSN 5920-01-138-1764
NSN 6135-00-491-9864
NSN 6110-01-432-4517
NSN 5905-01-445-2333