Check swg valve
A nut, circular in shape, which may have wrenching facilities such as flats, holes, protrusions, slots or splines in or on the periphery or in the face opposite the bearing surface. For items having a thickness (or height) exceeding two times the outside diameter, use post, electrical-mechanical equipment. See also nut (1), plain, knurled. (when height or thickness and/or outside diameter is designated as a tolerance dimension, the maximum dimension will be used to determine compliance.)
NSN 5920-01-468-8098
NSN 5910-01-408-4238
NSN 5998-00-169-9694
NSN 5990-01-233-4178
NSN 5996-00-570-9695
NSN 6105-01-309-0084
NSN 5950-00-221-8637
NSN 5915-00-881-5067
NSN 5990-01-591-8797
NSN 2925-01-121-3355
NSN 4140-01-495-5623
NSN 6685-00-730-8682