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 6145-00-365-0121
NSN 5855-01-327-2681
NSN 5985-01-045-2748
NSN 5925-00-172-1217
NSN 5935-00-917-6164
NSN 6130-00-776-0157
NSN 5975-01-057-7748
NSN 5960-00-051-0132
NSN 5998-00-102-5407
NSN 5920-00-318-7150
NSN 6110-01-237-5440
NSN 6620-00-122-8136