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 6145-00-216-6613
NSN 5975-00-672-9283
NSN 5999-01-400-0883
NSN 4140-01-371-1565
NSN 5905-01-079-3852
NSN 4140-00-192-0269
NSN 6240-00-826-1349
NSN 5935-00-196-0697
NSN 4140-01-373-4524
NSN 5905-01-517-6122
NSN 6685-01-578-7668
NSN 6220-01-439-3490