3b thread class right-hand flush (flat) countersunk (included angle - less than 135 deg w or w/o chamfer) head style 0.750" grip length 20 thread quantity per inch unc thread series
3a thread class right-hand 0.313" thread length round extended washer head style 28 thread quantity per inch cadmium or zinc surface treated unf thread series
flush (flat) countersunk (included angle - less than 135 deg w or w/o chamfer) head style 1.095" grip length 5240 double pounds per square inch shear strength cadmium bolt surface treated
3a thread class right-hand flush countersunk head style 0.803" grip length 15300 double pounds per square inch shear strength nickel surface treated unf thread series
3a thread class right-hand 0.327" thread length flat countersunk head style 32 thread quantity per inch passivate screw surface treated unjf thread series
3a thread class right-hand 0.249" thread length flat countersunk head style 40 thread quantity per inch passivate screw surface treated unjc thread series
3a thread class right-hand 0.438" thread length flat countersunk head style 32 thread quantity per inch cadmium screw surface treated unf thread series
3a thread class right-hand 0.422" thread length flat countersunk head style 32 thread quantity per inch cadmium screw surface treated unf thread series
2a thread class right-hand 0.925" thread length flat chamfer head style 20 thread quantity per inch navy special project passivate screw surface treated unc thread series
