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 6620-01-480-6887
NSN 6610-01-115-9171
NSN 6130-01-627-4124
NSN 6135-01-216-7170
NSN 5985-01-315-6566
NSN 5925-00-929-7829
NSN 6610-01-359-6555
NSN 4140-01-032-7621
NSN 6110-00-381-0602
NSN 6320-01-475-7654
NSN 5985-01-634-0635
NSN 6130-01-473-5355