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 4140-01-219-1506
NSN 5996-01-131-9353
NSN 5855-01-398-9548
NSN 5855-00-079-2370
NSN 5960-00-814-2154
NSN 5915-00-965-0535
NSN 6645-01-058-6260
NSN 5999-00-901-2161
NSN 5975-01-053-6540
NSN 5985-01-168-8546
NSN 4140-01-142-8340
NSN 6240-01-087-8328