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 6240-01-532-7337
NSN 5905-01-426-8957
NSN 5855-00-310-2740
NSN 4140-00-052-0920
NSN 5985-01-568-4842
NSN 5895-01-450-5878
NSN 5965-00-009-8679
NSN 5996-00-260-8291
NSN 5855-01-207-5616
NSN 6620-01-352-5640
NSN 2925-01-386-7392
NSN 5950-01-476-7341