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 6135-00-681-2702
NSN 5835-01-386-4027
NSN 5835-01-355-0308
NSN 5960-00-968-7582
NSN 6150-00-170-4515
NSN 5915-00-442-3159
NSN 5996-01-010-0257
NSN 5915-00-371-8402
NSN 6610-01-514-0745
NSN 6150-00-246-6673
NSN 6240-01-072-6103
NSN 6610-01-291-4173