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 6150-01-653-1263
NSN 5990-00-891-5370
NSN 2925-01-308-9809
NSN 4140-01-106-2559
NSN 5895-01-320-2304
NSN 6320-00-646-3311
NSN 6645-01-205-3869
NSN 5975-01-430-7136
NSN 5965-01-617-9182
NSN 5975-00-186-3968
NSN 6685-01-397-5659
NSN 6645-00-140-5173