2a thread class right-hand 2.422" overall length 0.828" overall width 4 holes 0.115 in. dia. on 0.469 in. by 1.687 in. ctrs, for insert mtg hood, side opening w/jackscrew unc thread series
2a single mounting facility thread class 0.437" single mounting facility thread length 3.879" overall length tap, circular, bushing mount unef single mounting facility thread series