2a thread class right-hand 0.538" thread length flat countersunk head style 56 thread quantity per inch passivate screw surface treated unc thread series
3a thread class right-hand 0.403" thread length flat countersunk head style 1.740" grip length 28 thread quantity per inch cadmium surface treated unjf thread series
3a thread class right-hand flush countersunk head style 0.432" grip length 125000 single pounds per square inch shear strength grit blast top of head unjc thread series
3a thread class right-hand 0.338" thread length flat countersunk head style 0.552" grip length 32 thread quantity per inch cadmium surface treated unjf thread series
2a thread class right-hand 2.750" thread length hexagon head style 7 thread quantity per inch navy special project zinc surface treated unc thread series