Design mil-dtl-01222 type iii style a or b
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 4140-01-142-3192
NSN 5985-00-411-3698
NSN 5925-00-826-8887
NSN 2925-01-474-3363
NSN 5835-01-608-4285
NSN 6320-01-067-0474
NSN 6220-00-483-9106
NSN 6130-01-596-0768
NSN 5945-00-945-7242
NSN 6130-00-610-2392
NSN 6130-00-329-7773
NSN 5915-01-525-7625