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 6620-01-271-8984
NSN 6650-00-179-8970
NSN 5985-01-085-5573
NSN 5990-01-254-3197
NSN 6610-01-594-5362
NSN 5895-00-910-4464
NSN 5910-00-392-6822
NSN 5985-01-160-7140
NSN 5975-01-567-7367
NSN 5975-00-615-2582
NSN 6220-00-593-1779
NSN 5996-01-095-1356