3a thread class right-hand 0.649" thread length spline drive shear head head style 0.726" grip length 20 thread quantity per inch passivate surface treated unjf thread series
3a thread class right-hand 0.363" thread length flat countersunk head style 0.428" grip length 32 thread quantity per inch cadmium surface treated unjf thread series
3a thread class right-hand 0.300" thread length flat countersunk undercut head style 32 thread quantity per inch passivate screw surface treated unjf thread series