Design mil-dtl-01222 type iii style a or b
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 6620-01-244-9631
NSN 6150-00-439-8762
NSN 5935-00-969-5601
NSN 5998-00-180-0853
NSN 5998-01-142-7160
NSN 7035-01-364-8454
NSN 6650-00-299-9681
NSN 6620-01-136-5492
NSN 5915-00-155-4766
NSN 5930-00-173-1072
NSN 5915-00-411-6186
NSN 6110-01-304-4247