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 6320-00-098-2858
NSN 6220-00-816-8131
NSN 6610-00-482-7339
NSN 5895-00-190-5709
NSN 4140-01-383-6184
NSN 5996-00-026-9118
NSN 6220-01-298-0488
NSN 5915-01-370-8404
NSN 2925-01-030-6580
NSN 5930-01-444-4011
NSN 5915-01-333-4749
NSN 6645-00-068-3536