Nut, hex, heavy duty (requested name)
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 5920-00-008-4770
NSN 5920-01-620-2543
NSN 5855-01-374-9116
NSN 6650-00-451-8174
NSN 5975-00-075-0466
NSN 5835-01-460-6054
NSN 6105-00-596-9962
NSN 6685-00-085-2404
NSN 5915-01-321-3234
NSN 6220-01-417-9224
NSN 6620-01-216-0904
NSN 6610-01-211-0835