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 6220-01-381-1074
NSN 6150-01-218-6451
NSN 5965-01-147-5847
NSN 6320-01-451-0821
NSN 5835-01-573-8449
NSN 6220-01-371-1058
NSN 5985-01-460-1835
NSN 5915-01-633-9845
NSN 6130-01-521-4461
NSN 5925-01-532-3196
NSN 6620-01-193-4764
NSN 5910-00-253-7178