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 6650-01-644-7722
NSN 2925-01-271-8727
NSN 6150-01-516-5130
NSN 6110-00-905-6148
NSN 5950-01-361-9148
NSN 6220-01-600-0257
NSN 5895-01-222-7259
NSN 6650-01-203-8263
NSN 6620-01-542-9999
NSN 5990-01-650-9034
NSN 6320-00-593-0379
NSN 5930-00-452-6365