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 6130-00-639-0666
NSN 6130-00-595-5943
NSN 5996-01-077-2231
NSN 5915-00-636-9785
NSN 5895-00-707-6663
NSN 5990-00-538-5261
NSN 5895-00-063-4498
NSN 5855-01-339-1718
NSN 6610-01-533-1115
NSN 5960-01-170-4057
NSN 5915-01-006-0169
NSN 2925-01-386-7392