3b thread class right-hand 16 thread quantity per inch navy special project magnetic particle inspect; groove, 0.100 in. w on ctr od; paired holes meet at ctr groove; chamfer, 45.0 deg, 0.063 in. lg, both ends passivate surface treated
3b thread class right-hand 18 thread quantity per inch cadmium plate, qq-p-416, type 2, class 2, before painting; no paint in holes; magnetic particle inspect chromate zinc except threads surface treated