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 6240-00-137-2498
NSN 2925-00-103-6822
NSN 6685-00-098-1771
NSN 5935-00-144-8017
NSN 5855-00-451-5224
NSN 5855-01-424-2769
NSN 6320-01-454-1965
NSN 5999-01-095-3841
NSN 6240-01-556-7096
NSN 6130-01-224-5521
NSN 6220-01-378-3488
NSN 5965-01-296-8991