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 6220-01-364-8666
NSN 5985-01-194-4501
NSN 5975-01-031-1303
NSN 6105-00-994-3441
NSN 5996-01-352-0085
NSN 5895-01-157-8795
NSN 5925-01-576-9256
NSN 5915-00-171-1812
NSN 6685-00-184-3894
NSN 5950-00-413-0606
NSN 6135-01-290-6487
NSN 6240-00-466-0703