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 6645-01-534-5545
NSN 6240-00-357-7976
NSN 5998-01-257-9505
NSN 5999-00-231-3917
NSN 5835-01-632-6627
NSN 6620-01-169-9470
NSN 6220-01-029-5037
NSN 5975-01-077-8008
NSN 6220-00-528-7752
NSN 5920-01-660-4268
NSN 5855-01-334-6594
NSN 5996-01-587-2082