2b thread class right-hand 12 thread quantity per inch navy special project radius cut out at both ends 0.20 in, threaded portion extends below plate passivate surface treated
3b thread class right-hand 16 thread quantity per inch counterbore drilled holes 0.218 in. min to 0.220 in. max diameter 0.072 in. min to 0.U82 in. max deep