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 5999-01-514-0453
NSN 6220-01-529-2262
NSN 6150-01-200-2411
NSN 5996-00-358-6257
NSN 6620-00-897-7759
NSN 5960-00-016-0372
NSN 6145-00-623-7224
NSN 5996-00-001-2773
NSN 6135-01-121-3225
NSN 5910-01-653-9664
NSN 6645-01-358-7485
NSN 5960-00-005-0270