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 5950-01-244-2407
NSN 6220-01-577-2547
NSN 6110-00-900-2836
NSN 5910-00-446-6571
NSN 6145-01-631-0009
NSN 6135-00-519-1325
NSN 5999-00-319-2259
NSN 5915-00-111-4296
NSN 7035-01-227-2546
NSN 6620-00-159-0866
NSN 6150-01-500-2045
NSN 5935-01-554-6164