Used to ground hydrogen tank vent stacks
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 5925-00-533-1547
NSN 5905-01-383-5597
NSN 6105-01-485-3903
NSN 5905-01-270-2704
NSN 6240-00-458-2550
NSN 5996-00-891-4036
NSN 5965-01-425-2039
NSN 6650-01-515-0391
NSN 6320-01-610-4410
NSN 5975-01-588-2803
NSN 5855-01-208-1471
NSN 6130-00-079-5803