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 5990-00-543-2755
NSN 6150-00-337-8328
NSN 6610-00-138-0740
NSN 6645-01-582-2601
NSN 5975-00-611-3174
NSN 5905-01-136-5326
NSN 5998-01-141-7486
NSN 7035-01-013-9889
NSN 5915-01-160-8175
NSN 2925-01-063-7876
NSN 5930-00-660-6166
NSN 5895-00-396-3162