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 6135-00-840-6451
NSN 6685-01-281-3545
NSN 6150-01-611-8537
NSN 5985-01-007-2311
NSN 5975-00-859-2180
NSN 4140-01-109-0451
NSN 6220-00-313-2297
NSN 5996-01-160-5588
NSN 5965-01-593-1813
NSN 6105-01-298-3630
NSN 5915-01-050-4321
NSN 6135-00-416-2898