2b thread class right-hand 32 thread quantity per inch navy special project 0.016 in. wide by 0.234 in. deep undercut between flange passivate surface treated
2b thread class right-hand 40 thread quantity per inch 0.026 to 0.036 inch wide by 0.005 to 0.015 inch deep undercut under flange passivate surface treated
3b thread class right-hand 20 thread quantity per inch 2 holes 90 deg apart 0.061 in. min 0.064 in. max dia on 1.188 in. dia b.c., self-locking cadmium surface treated
