A-A-52420, COMMERCIAL ITEM DESCRIPTION: PLUG, EXPANSION (13 JAN 1993) [SUPERSEDING MIL-P-20691C & MS35648A]

A-A-52420, COMMERCIAL ITEM DESCRIPTION: PLUG, EXPANSION (13 JAN 1993) [SUPERSEDING MIL-P-20691C & MS35648A]., This commercial item description (CID) covers the requirements of a curved, circular steel disc expansion plug used for closing holes in castings and other similar openings. The expansion plug is referred to herein as "plug".