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 5910-00-111-8525
NSN 5835-01-256-5555
NSN 6220-01-058-9107
NSN 6620-00-862-5567
NSN 6320-00-908-6841
NSN 5915-01-429-3077
NSN 6150-00-891-7922
NSN 5990-01-263-0362
NSN 5990-01-463-5400
NSN 6240-00-267-1167
NSN 6150-01-287-9831
NSN 5960-01-366-3260