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 6610-00-121-4683
NSN 6320-01-225-0178
NSN 5925-00-702-7367
NSN 6610-01-525-7266
NSN 5930-01-464-4042
NSN 6645-00-474-5689
NSN 5945-00-787-3068
NSN 6650-01-557-4143
NSN 4140-01-606-8772
NSN 6685-01-137-5710
NSN 5835-00-829-0670
NSN 5910-00-204-0111