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 6610-01-167-8747
NSN 6150-01-415-5625
NSN 5930-00-149-1696
NSN 5905-00-559-8172
NSN 6110-01-276-5407
NSN 7035-01-449-1189
NSN 5905-01-007-1448
NSN 5985-01-483-4049
NSN 5895-01-149-2622
NSN 7035-00-131-8219
NSN 6145-01-432-0088
NSN 5910-01-614-1667