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 6610-00-451-3325
NSN 5925-01-283-9588
NSN 6620-00-270-3275
NSN 5910-00-248-6899
NSN 6135-01-216-5479
NSN 5950-01-207-6403
NSN 6650-01-200-7657
NSN 6645-00-226-2270
NSN 6320-01-558-2141
NSN 5965-01-153-1965
NSN 6685-00-900-4246
NSN 5915-00-431-3157