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 5905-01-227-1783
NSN 4140-01-011-4078
NSN 5930-01-485-3368
NSN 5855-01-406-2606
NSN 5910-00-943-3921
NSN 5950-01-460-7769
NSN 6685-01-106-6565
NSN 5985-01-646-8404
NSN 5930-01-358-8501
NSN 6610-00-064-9351
NSN 5915-01-122-5031
NSN 6650-01-323-6252