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 6645-00-270-6817
NSN 5910-00-801-3866
NSN 5985-01-643-2168
NSN 5925-01-381-2528
NSN 6320-01-512-2031
NSN 6220-01-630-0946
NSN 5975-01-593-2566
NSN 6610-01-660-3966
NSN 4140-01-560-9401
NSN 5965-01-470-0393
NSN 6620-00-286-5721
NSN 6135-01-322-4655