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 5975-00-723-0390
NSN 5975-01-630-8592
NSN 5895-01-429-0137
NSN 4140-01-660-4143
NSN 6130-00-375-6299
NSN 5960-01-458-0774
NSN 6135-01-551-0562
NSN 5999-01-087-4201
NSN 5835-00-770-2843
NSN 5935-00-276-5326
NSN 5855-01-391-7472
NSN 2925-01-376-9236