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 5925-00-464-0668
NSN 5905-01-580-8518
NSN 6105-00-854-2606
NSN 4140-00-215-8593
NSN 6650-01-382-6411
NSN 6320-01-532-7491
NSN 5855-00-482-9876
NSN 5996-01-359-5912
NSN 5920-00-111-2375
NSN 5905-01-318-3280
NSN 5915-00-814-2860
NSN 2925-01-446-6976