X 3 8 18 July 8, 2019 16 32 64 128 X 3 8 18 solution 3 x 8 )= 180 X 3 18x 8 0 5 3 x 8 18 3 8 x 18 nptf 3 8 x 18 drill bit 3 8 x 18 npt 1 3 8 x 18 8 4 x 3 6 18 5 16 18 x 3 8 8 2 x 3 18 10 x 3 )+ 8 18x 30 3 8 x 18 tap drill size 3 8 x 18 bolt 3 8 x 18 tap