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 4140-01-233-1517
NSN 5930-01-600-4265
NSN 6130-01-111-7364
NSN 6105-01-439-4438
NSN 6620-00-068-2503
NSN 4140-00-613-9209
NSN 6620-01-649-0748
NSN 5945-00-323-8367
NSN 6620-01-577-6285
NSN 5975-01-103-0396
NSN 5895-01-460-6885
NSN 5915-00-372-4522