Groove 0.062 in. W by 0.031 in. Deep in outside surface
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 6650-00-102-7436
NSN 5998-00-353-6471
NSN 6620-01-296-9803
NSN 5910-00-762-5881
NSN 5935-01-417-6615
NSN 6645-01-091-0009
NSN 6240-01-578-6227
NSN 5985-01-029-3648
NSN 5998-01-154-0212
NSN 5910-01-169-8162
NSN 5855-01-088-8700
NSN 5945-00-445-3373