1/16 inch
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 5895-01-646-1175
NSN 6110-01-643-8208
NSN 6145-00-226-0515
NSN 6620-01-328-9862
NSN 5960-00-287-9932
NSN 5925-01-322-4366
NSN 5975-00-449-1209
NSN 6135-00-223-9563
NSN 5905-01-647-1286
NSN 5910-01-228-6829
NSN 6150-01-301-0899
NSN 5925-00-643-9404