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.)
Dept. of the Navy NSN 6150-00-987-5350
NSN 5999-01-501-5783
NSN 5950-01-090-9131
NSN 5920-00-868-7651
NSN 5998-00-740-7515
NSN 6610-01-069-1156
NSN 5935-00-224-4476
NSN 6145-01-029-9026
NSN 6610-01-140-9608
NSN 5950-00-119-1478
NSN 7035-01-386-5722
NSN 6110-01-425-1449