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 6150-00-161-2480
NSN 5990-01-510-4699
NSN 6110-01-089-9017
NSN 6320-01-435-5991
NSN 5999-00-433-5420
NSN 5999-00-559-4033
NSN 5999-01-262-6786
NSN 5905-01-512-1354
NSN 5960-00-224-6828
NSN 5930-01-464-4642
NSN 4140-00-122-6422
NSN 5945-00-753-1054