2a thread class right-hand 1.750" thread length flat countersunk head style 80 thread quantity per inch passivate screw surface treated unf thread series
2a thread class right-hand 1.750" thread length flat countersunk head style 24 thread quantity per inch passivate screw surface treated unc thread series
3a thread class right-hand 0.625" thread length pan no. 2 head style 56 thread quantity per inch navy special project passivate screw surface treated unjc thread series