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 5999-00-168-1888
NSN 5975-01-338-0940
NSN 6645-01-380-0180
NSN 5910-00-883-8120
NSN 6145-01-400-3838
NSN 6110-00-585-8920
NSN 6610-00-490-9514
NSN 5935-00-812-2903
NSN 5999-01-581-3140
NSN 6240-01-032-5105
NSN 6620-01-513-6358
NSN 5975-01-281-8347