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 6110-00-630-5255
NSN 5925-01-222-6183
NSN 5930-01-534-3928
NSN 6110-00-465-9128
NSN 5950-01-464-0042
NSN 5945-01-035-7488
NSN 6685-00-139-3191
NSN 6135-00-947-0406
NSN 6150-01-090-0720
NSN 6650-01-066-0420
NSN 5905-00-466-3619
NSN 6320-01-006-6138