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 6645-01-421-2445
NSN 6620-00-324-0930
NSN 5999-01-444-5242
NSN 5925-01-411-7771
NSN 5920-01-003-8110
NSN 6145-00-080-8739
NSN 6610-00-553-5103
NSN 5999-01-500-1238
NSN 6610-01-559-1447
NSN 5935-00-224-6020
NSN 5990-00-611-1661
NSN 6685-01-609-7280