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 4140-00-908-2763
NSN 6220-01-209-3893
NSN 6220-01-184-3052
NSN 5950-00-529-0264
NSN 5925-01-610-2594
NSN 6150-01-122-4922
NSN 2925-01-457-5649
NSN 6135-00-223-9563
NSN 5905-01-199-9445
NSN 5990-00-007-8166
NSN 5965-01-482-9711
NSN 5999-01-050-1344