Plate has a recess for an o-ring.
A metallic or nonmetallic item which is rigid, flat and generally smooth. Its thickness is small in comparison to its length and width. It is designed for mounting another item and may have drilled or threaded holes or other facilities for mounting to a supporting object or surface. See support, as modified. Do not use if a more specific name applies.
NSN 5895-01-453-9471
NSN 5975-01-434-5967
NSN 5990-00-647-4008
NSN 6105-00-468-4361
NSN 5985-00-479-7362
NSN 5960-01-045-0522
NSN 7035-00-616-4410
NSN 5895-01-659-4102
NSN 5998-01-115-1333
NSN 5855-01-634-0259
NSN 5855-01-267-0733
NSN 6320-01-521-1764