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 6145-01-413-9002
NSN 5990-01-548-5979
NSN 5960-01-502-6270
NSN 5975-01-596-5800
NSN 6220-01-177-4695
NSN 6610-01-044-4740
NSN 6105-00-338-9436
NSN 5998-01-652-5319
NSN 6620-01-101-4408
NSN 6110-00-127-9957
NSN 5915-00-221-2391
NSN 6685-00-851-0515