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 6240-00-838-5981
NSN 5935-00-221-8636
NSN 6645-01-413-8003
NSN 5999-01-088-6687
NSN 5930-00-927-3205
NSN 6145-01-254-2935
NSN 6220-01-432-0089
NSN 6685-01-212-2079
NSN 6320-01-369-5014
NSN 5975-00-715-1563
NSN 5990-01-110-8979
NSN 5985-00-791-7588