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 5925-00-905-5135
NSN 5905-01-245-6618
NSN 5975-01-365-9127
NSN 5910-01-169-5292
NSN 6220-01-138-1622
NSN 6240-01-566-9408
NSN 5835-01-235-9051
NSN 5960-00-497-4142
NSN 6240-01-158-0402
NSN 6320-01-369-5014
NSN 5895-01-444-6439
NSN 5990-01-213-6319