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 6320-01-006-6138
NSN 5985-00-137-6379
NSN 6145-00-871-5361
NSN 7035-00-631-3782
NSN 5996-00-752-6007
NSN 6220-01-321-5909
NSN 5990-01-582-1977
NSN 6145-01-098-3043
NSN 6220-00-269-4556
NSN 5945-00-805-7494
NSN 5990-01-417-4402
NSN 6150-01-041-9373