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
2a thread class right-hand 3.000" thread length button head style 13 thread quantity per inch furnished with one square nut zinc 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