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 7035-00-868-2640
NSN 6150-00-644-8745
NSN 5975-00-794-6811
NSN 6610-01-390-6925
NSN 5975-00-770-0151
NSN 5855-01-144-2939
NSN 5990-01-019-3447
NSN 5910-01-114-5169
NSN 5999-01-014-5337
NSN 5965-01-460-4172
NSN 6145-01-100-4151
NSN 5835-01-622-2556