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 5915-01-019-8618
NSN 6610-00-701-2600
NSN 6150-00-410-7091
NSN 5920-00-127-2303
NSN 5935-01-327-3773
NSN 6650-01-512-8103
NSN 5895-01-376-0482
NSN 5945-01-343-6899
NSN 5950-00-112-8869
NSN 5975-01-278-6576
NSN 5905-01-176-4461
NSN 6145-01-434-4155