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 6150-00-928-0790
NSN 6645-01-440-0755
NSN 6685-00-998-6206
NSN 6610-01-459-4870
NSN 6135-01-020-3805
NSN 5835-01-464-7038
NSN 5855-01-007-9541
NSN 5920-01-411-1930
NSN 6130-00-272-5351
NSN 6240-01-470-1111
NSN 6110-00-022-8673
NSN 5999-00-175-9783