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 4140-00-322-9987
NSN 6150-01-120-1960
NSN 6610-01-394-7695
NSN 2925-01-014-0118
NSN 6145-00-997-7051
NSN 6135-00-255-1340
NSN 6645-01-307-3327
NSN 5835-01-084-6997
NSN 4140-00-770-1052
NSN 6240-00-269-9727
NSN 5985-01-611-4143
NSN 2925-01-336-8019