Material steel
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 6620-01-324-1438
NSN 5965-00-045-7156
NSN 5935-01-195-6560
NSN 5998-00-553-9535
NSN 5965-01-385-7813
NSN 5965-01-128-4381
NSN 6240-00-627-1493
NSN 5935-01-350-1238
NSN 6220-01-366-6747
NSN 5990-01-081-3845
NSN 5975-00-240-2763
NSN 5990-01-048-7139