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 5990-01-598-3251
NSN 5930-00-488-9179
NSN 6620-01-337-0652
NSN 6645-00-843-8837
NSN 5998-01-452-2250
NSN 6130-01-195-0773
NSN 6145-00-932-0724
NSN 5920-00-311-3953
NSN 5996-01-512-6170
NSN 5920-00-373-3636
NSN 5910-01-358-3954
NSN 6145-01-205-9320