Used on periscope f10513360. 3a thread class right-hand 0.625" thread length fillister head style 20 thread quantity per inch cadmium surface treated unf thread series
2a thread class right-hand 0.190" thread length flat countersunk head style 40 thread quantity per inch navy special project passivate surface treated unc thread series
left-hand 6.500" thread length 4 thread quantity per inch 4.500 in. l x 1.000 in. dia end with 0.312 in. w x 0.188 in. d x 4.000 in. l keyway; nut included-dwg no. 179496 1/4 acme thread series
3a thread class right-hand 0.270" thread length flat chamfer head style 32 thread quantity per inch navy special project passivate surface treated unc thread series
2a thread class right-hand 0.250" thread length flat countersunk undercut head style 32 thread quantity per inch epoxy primer enamel surface treated unf thread series