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 6240-01-250-3574
NSN 6220-01-411-6919
NSN 6320-01-611-4918
NSN 5910-00-987-1596
NSN 5920-00-738-1131
NSN 5895-00-738-5994
NSN 6135-01-216-7170
NSN 5895-01-417-1880
NSN 5985-01-507-2540
NSN 6220-01-401-5337
NSN 7035-00-104-7613
NSN 6610-01-643-2315