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 6620-01-449-6927
NSN 5920-00-216-8665
NSN 5855-01-203-4719
NSN 6220-00-102-9683
NSN 5895-01-042-0762
NSN 5975-01-535-7193
NSN 5996-00-496-8806
NSN 5910-00-275-0827
NSN 6110-01-004-9870
NSN 6240-01-439-8097
NSN 5905-00-678-2044
NSN 5835-00-507-3561