3b thread class right-hand 0.367" thread length 18 thread quantity per inch has internal thread lock passivate surface treated keylock unc thread series
3b thread class right-hand 0.305" thread length 20 thread quantity per inch has internal thread lock passivate surface treated grooved keylock unc thread series
3b thread class 32 thread quantity per inch navy special project one hole 0.104 in.dia thru one side 0.140 in.min to 0.150 in.max from end passivate surface treated plain unf thread series