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 6145-00-209-5657
NSN 6320-01-353-9753
NSN 5965-01-481-2422
NSN 6650-01-148-2161
NSN 5960-00-136-2505
NSN 5905-01-160-7546
NSN 6620-00-067-4946
NSN 6220-00-237-8779
NSN 6685-01-415-3117
NSN 5960-01-531-9108
NSN 5965-01-358-4923
NSN 5999-01-539-8403