3a thread class right-hand 1.688" thread length flat countersunk head style 56 thread quantity per inch navy special project cadmium screw surface treated unjc thread series
3a thread class right-hand 0.141" thread length fillister head style 40 thread quantity per inch passivate springpassivate stand-offpassivate threads surface treated unc thread series
3a thread class right-hand 0.156" thread length fillister head style 40 thread quantity per inch passivate springpassivate stand-offpassivate threads surface treated unc thread series
3a thread class right-hand 0.141" thread length fillister head style 40 thread quantity per inch passivate springpassivate stand-offpassivate threads surface treated unc thread series