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 6620-00-816-8240
NSN 6130-01-064-2874
NSN 6105-00-356-6677
NSN 6645-01-356-8252
NSN 5990-01-221-6361
NSN 6320-01-422-1212
NSN 5905-01-536-8512
NSN 6150-01-519-9309
NSN 6240-01-075-4857
NSN 5920-01-513-1442
NSN 5985-01-126-9081
NSN 5950-01-168-8071