3a thread class right-hand 0.278" thread length hexagon head style 32 thread quantity per inch drill head 0.120 deep 0.058 in. min, 0.060 in. max dia; no internal drive unc thread series
2a thread class right-hand 0.128" thread length flat countersunk head style 80 thread quantity per inch passivate screw surface treated unf thread series
3a thread class right-hand 1.695" thread length flat countersunk head style 24 thread quantity per inch passivate screw surface treated unjf thread series
3a thread class right-hand 0.314" thread length flat countersunk head style 32 thread quantity per inch passivate screw surface treated unjf thread series