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 6645-00-761-7256
NSN 6150-01-262-9606
NSN 6650-01-614-7328
NSN 5996-01-086-5903
NSN 5985-01-290-9392
NSN 5985-01-249-5083
NSN 6105-00-753-7458
NSN 5925-01-630-8943
NSN 6240-00-008-4550
NSN 5950-00-768-9182
NSN 5895-00-525-3295
NSN 6240-00-519-2110