3a thread class right-hand 0.224" thread length flat chamfer head style 56 thread quantity per inch passivate screw surface treated thd relieved groove 0.031 in. wide by 0.067 in. min, 0.072 in. max dia, head offset from centerline of longitudinal axis 0.013 in. min, 0.015 in. max unf thread series
2a thread class right-hand 0.188" thread length flat countersunk head style 56 thread quantity per inch cadmium screw surface treated unc thread series
3a thread class right-hand 0.094" thread length hexagon head style 0.047" hole diameter 24 thread quantity per inch cadmium screw surface treated unc thread series
2a thread class right-hand 0.330" thread length flat chamfer head style 40 thread quantity per inch navy special project passivate screw surface treated hole 0.134 to 0.139 in. dia, 0.120 in. deep on longitudinal axis of head unc thread series
2a thread class right-hand 0.270" thread length fillister head style 0.070" hole diameter 48 thread quantity per inch navy special project lacquer screw surface treated unf thread series
3a thread class right-hand 0.375" thread length flat countersunk head style 32 thread quantity per inch passivate screw surface treated unc thread series
2a thread class right-hand 0.500" thread length flat countersunk head style 56 thread quantity per inch anodize screw surface treated unc thread series
