2b thread class right-hand 32 thread quantity per inch navy special project both ends of barrel counterbored to 0.171 in. dia by 0.031 in. deep passivate surface treated
2b thread class left-hand 32 thread quantity per inch navy special project both ends of barrel counterbored to 0.171 in. dia by 0.031 in. deep passivate surface treated
3b thread class right-hand 24 thread quantity per inch 0.085 in. deep notch cut from top of cylinder starting 0.160 in. from center running parallel to hole passivate surface treated
