2a thread class right-hand 0.553" thread length flat countersunk head style 24 thread quantity per inch anodize screw surface treated unc thread series
3a thread class right-hand 0.616" thread length flat countersunk head style 0.615" grip length 24 thread quantity per inch aluminum surface treated unjf thread series
3a thread class right-hand 0.631" thread length flat countersunk head style 0.552" grip length 20 thread quantity per inch dry film lubricant applied to shank passivate surface treated unjf thread series
3a thread class right-hand 0.631" thread length flat countersunk head style 0.740" grip length 20 thread quantity per inch dry film lubricant applied to shank passivate surface treated unjf thread series
3a thread class right-hand 0.506" thread length flat countersunk head style 0.240" grip length 24 thread quantity per inch passivate surface treated unjf thread series