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 5950-00-217-2966
NSN 5920-00-967-1396
NSN 5990-00-907-3912
NSN 5950-01-261-2244
NSN 5920-01-434-7527
NSN 6645-01-480-7646
NSN 6645-01-204-8677
NSN 6650-00-833-4002
NSN 6685-01-630-3146
NSN 5975-01-519-2841
NSN 6145-01-300-0472
NSN 6150-00-107-4146