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 5998-01-585-1672
NSN 4140-00-230-4252
NSN 5855-01-523-3511
NSN 6240-00-406-1510
NSN 6610-01-384-1587
NSN 6110-01-305-0012
NSN 6220-01-580-1209
NSN 5999-01-587-5589
NSN 5975-00-468-6111
NSN 6685-01-320-2631
NSN 6320-00-646-3311
NSN 6650-01-211-2673