3a thread class right-hand 0.388" thread length flat countersunk head style 0.428" grip length 28 thread quantity per inch passivate surface treated unjf thread series
flush (flat) countersunk (included angle - less than 135 deg w or w/o chamfer) head style 1.345" grip length 9000 double pounds per square inch shear strength cadmium surface treated
3a thread class right-hand 0.641" thread length flat countersunk head style 0.688" grip length 24 thread quantity per inch cadmium surface treated unf thread series
3a thread class right-hand 0.469" thread length flat countersunk head style 1.000" grip length 28 thread quantity per inch cadmium surface treated unf thread series