2b thread class right-hand 18 thread quantity per inch keyway perpendicular to bearing surface through threads 0.192 in. max wide nickel surface treated
2b thread class right-hand 40 thread quantity per inch navy special project knurled boss, 0.030 in. min, 0.035 in. max lg, 0.142 in. dia; min thd dp 0.250 in. passivate surface treated