6.35mm by 2.49mm
No other part numbers with same form, fit, and function found.
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 5975-00-185-5243
NSN 6105-01-425-6487
NSN 6130-01-607-6305
NSN 5855-01-550-1057
NSN 6650-01-555-7384
NSN 5905-00-433-0439
NSN 5915-00-429-1986
NSN 5999-00-929-7549
NSN 5975-00-009-2725
NSN 5999-00-453-2472
NSN 4140-01-596-7716
NSN 5965-01-030-0108