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 6240-01-165-2693
NSN 6320-00-857-4073
NSN 5945-00-223-7265
NSN 5945-01-376-0203
NSN 5975-01-494-6333
NSN 6650-01-453-1144
NSN 5990-00-578-8850
NSN 5905-00-078-8395
NSN 5950-01-326-2285
NSN 5910-01-446-8917
NSN 6220-01-366-6747
NSN 5965-01-258-5662