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 5950-01-401-5321
NSN 5905-01-239-8217
NSN 6645-01-373-2262
NSN 6240-01-226-8097
NSN 6650-01-399-0628
NSN 5996-01-396-8829
NSN 6145-00-578-7522
NSN 5925-00-479-8233
NSN 6220-00-769-7858
NSN 5930-01-522-1690
NSN 6130-00-269-8273
NSN 6320-01-459-6992