2a thread class right-hand 0.322" thread length oval countersunk head style 32 thread quantity per inch passivate screw surface treated unf thread series
3a thread class right-hand 0.279" thread length pan head style 28 thread quantity per inch navy special project ceramic screw surface treated unjf thread series
2a thread class right-hand 0.086" thread length flat countersunk head style 80 thread quantity per inch passivate screw surface treated unf thread series
3a thread class right-hand 0.381" thread length flat countersunk head style 32 thread quantity per inch aluminum screw surface treated cetyl alcohol per mil-l-87132 ty 1 grade 8 unjf thread series