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 5996-01-077-4655
NSN 6610-00-618-0772
NSN 5960-01-632-6576
NSN 5895-00-168-1590
NSN 5895-01-258-1787
NSN 5999-00-915-5560
NSN 5925-01-644-3669
NSN 2925-01-424-0235
NSN 6135-01-168-2944
NSN 6320-01-369-5014
NSN 6685-01-418-8753
NSN 6150-01-058-3570