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 5930-01-568-5845
NSN 5960-01-023-8800
NSN 5895-01-509-7641
NSN 6130-00-325-0748
NSN 5960-01-271-0928
NSN 5915-00-487-3295
NSN 5960-01-015-8655
NSN 5990-00-277-3763
NSN 6240-01-331-0841
NSN 6645-01-174-4363
NSN 5960-01-276-2828
NSN 2925-00-791-8776