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 6220-01-608-4423
NSN 6130-01-499-7305
NSN 6240-01-315-4463
NSN 5985-00-276-5368
NSN 5985-01-231-9759
NSN 6610-00-462-1672
NSN 5925-00-301-0810
NSN 5975-00-230-4824
NSN 5975-00-216-4848
NSN 5990-00-391-6207
NSN 5960-01-192-7710
NSN 5915-00-597-0038