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 5835-01-553-6772
NSN 5990-00-027-7508
NSN 5998-01-577-3321
NSN 5945-00-960-8722
NSN 5915-01-415-6307
NSN 5930-01-410-7641
NSN 5990-01-044-4767
NSN 6645-01-529-5690
NSN 5965-00-947-2310
NSN 5945-01-268-1280
NSN 6240-01-366-2948
NSN 2925-00-601-0681