Used on mortar, m-29 2350-01-277-5770. 2a thread class right-hand 0.270" thread length pan head style 48 thread quantity per inch screw, machine-pan head, cross recessed, carbon steel, cadmium plated, unf-2a cadmium screw surface treated unf thread series
2a thread class right-hand 0.500" thread length flat countersunk head style 16 thread quantity per inch cadmium screw surface treated unc thread series