1.2475" bore diameter 2 keys on id of bore, 1.8000 in. min 1.8120 in. max lg, 0.2450 in. min 0.2520 in. max wide, 23.0 deg angle, 0.0312 in. by 45.0 deg corner chamfer, 180.0 deg apart on id of bore cadmium surface treated with insert and/or liner
3b thread class right-hand 2.7760" overall length 0.5005" bore diameter 20 thread quantity per inch cadmium surface treated ball type extended one side unf thread series
Used on tank,combat 105mm m48a5. t height 0.702 in.; thickness 0.220 in.; bent to a 45 deg angle; 10 pockets equally spaced - 3 holes have a 0.592 in. inside dia