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 6220-01-184-5668
NSN 6150-00-537-5538
NSN 6685-01-386-3110
NSN 5998-01-149-5211
NSN 5990-00-918-4467
NSN 5996-00-560-0931
NSN 5895-00-241-6169
NSN 5975-01-598-0329
NSN 6610-00-223-9457
NSN 5999-00-161-0620
NSN 5975-01-529-6895
NSN 5915-00-499-7413